阅读说明：本技术 介质移相器与天线 (Dielectric phase shifter and antenna ) 是由 江文 苏国生 黄明达 于 2021-06-11 设计创作，主要内容包括：本发明提供了一种介质移相器与天线,所述介质移相器,包括：移相电路,包括纵长型电路板及布置于电路板至少一个表面的多个移相传输线；介质活动机构,包括夹持活动件及一对纵长型介质夹板,所述介质夹板面面相对形成用于夹设所述移相电路的夹持空间,所述夹持活动件分别连接两个介质夹板；金属腔体,其提供用于容纳所述移相电路及介质活动机构的纵长型空腔,且在其非末端位置设有供夹持活动件暴露的滑动窗口,所述移相电路相对于金属腔体固定设置,所述介质活动机构相对于金属腔体可滑动设置。介质移相器在金属腔体的非末端位置设置滑动窗口,夹持活动件无需连接介质夹板的端部位置,便可移动介质夹板实施移相,控制介质移相器的移相性能。(The invention provides a dielectric phase shifter and an antenna, wherein the dielectric phase shifter comprises: the phase shifting circuit comprises a longitudinal circuit board and a plurality of phase shifting transmission lines arranged on at least one surface of the circuit board; the medium moving mechanism comprises a clamping moving part and a pair of longitudinal medium clamping plates, the surfaces of the medium clamping plates are opposite to form a clamping space for clamping the phase-shifting circuit, and the clamping moving part is respectively connected with the two medium clamping plates; the metal cavity is provided with a lengthwise cavity for accommodating the phase shift circuit and the medium moving mechanism, a sliding window for exposing the clamping moving part is arranged at the non-tail end position of the metal cavity, the phase shift circuit is fixedly arranged relative to the metal cavity, and the medium moving mechanism is arranged in a sliding mode relative to the metal cavity. The medium phase shifter is provided with a sliding window at the non-tail end position of the metal cavity, the clamping movable piece does not need to be connected with the end position of the medium clamping plate, the medium clamping plate can be moved to implement phase shifting, and the phase shifting performance of the medium phase shifter is controlled.)

1. A dielectric phase shifter, comprising:

the phase shifting circuit comprises a longitudinal circuit board and a plurality of phase shifting transmission lines arranged on at least one surface of the circuit board;

the medium moving mechanism comprises a clamping moving part and a pair of longitudinal medium clamping plates, the surfaces of the medium clamping plates are opposite to form a clamping space for clamping the phase-shifting circuit, and the clamping moving part is respectively connected with the two medium clamping plates;

the metal cavity is provided with a lengthwise cavity for accommodating the phase shift circuit and the medium moving mechanism, a sliding window for exposing the clamping moving part is arranged at the non-tail end position of the metal cavity, the phase shift circuit is fixedly arranged relative to the metal cavity, and the medium moving mechanism is arranged in a sliding mode relative to the metal cavity.

2. A dielectric phase shifter as recited in claim 1 wherein the metal cavity comprises a metal cover and a ground layer disposed on the dielectric board, the metal cover is fixedly disposed on the dielectric board, and the metal cover comprises two opposing side cavity walls and a top cavity wall for connecting the two side cavity walls.

3. The dielectric phase shifter as claimed in claim 2, wherein the sliding window is disposed on the top chamber wall, and two longitudinal sides of the sliding window and the side chamber walls connected thereto form a sliding rail for the clamping movable member to slide.

4. The dielectric phase shifter of claim 3, wherein the dielectric clamping plate is recessed from the top cavity wall toward the dielectric plate to form a clamping groove for clamping the clamping moving member.

5. The dielectric phase shifter as claimed in claim 4, wherein the clamping moving member includes sliding arms disposed at both sides and a clamping arm disposed between the two sliding arms, wherein a clamping sliding groove is formed between one sliding arm and an adjacent clamping arm, the clamping moving groove receives a groove wall of the clamping groove of the corresponding dielectric clamping plate and the corresponding slide rail, and the clamping arm extends into the clamping groove.

6. A dielectric phase shifter as claimed in claim 5 wherein a bypass gap is formed between the two clamping arms through which a circuit board of the phase shift circuit may pass.

7. The dielectric phase shifter of claim 2, wherein the side chamber wall is provided with an elastic limit protrusion facing the dielectric clamping plate.

8. The dielectric phase shifter as claimed in claim 2, wherein a pin for being inserted into the dielectric plate is disposed at a bottom of the circuit board of the phase shift circuit, a position-limiting protrusion is disposed at a top of the circuit board of the phase shift circuit, and a position-limiting hole is disposed on a top cavity wall of the metal cover corresponding to the position-limiting protrusion.

9. A dielectric phase shifter as claimed in claim 1, wherein the dielectric clamping plate is provided with a notch or an internal groove for impedance matching.

10. A dielectric phase shifter as claimed in claim 1, wherein the circuit board is divided into left and right sides along a center line perpendicular to a length direction of the circuit board, and the left and right sides of one of the side surfaces of the circuit board are each provided with a phase shift transmission line.

11. A dielectric phase shifter as claimed in claim 10, wherein the left and right sides of the other side of the circuit board are each provided with a phase-shifting transmission line, projections of the phase-shifting transmission lines on the same side of the two sides of the circuit board in the thickness direction of the circuit board coincide with each other, and the two phase-shifting transmission lines whose projections coincide with each other are electrically connected to each other through the metallized via hole.

12. The dielectric phase shifter of claim 10, wherein the phase shifting transmission line comprises an input terminal disposed at a middle portion of the circuit board and an output terminal disposed at an end portion of the circuit board, and the input terminal and the output terminal are both inserted into the dielectric board.

13. The dielectric phase shifter as claimed in claim 2, wherein the metal cover is fixed on the back surface of the dielectric board, and forms the metal cavity together with the ground layer on the back surface, and the front surface of the dielectric board is provided with a power dividing network;

the power distribution network comprises a common point end, conductor branches symmetrically arranged on two sides of the common point end and two independent ends formed at the tail ends of the conductor branches on the two sides, wherein the common point end is used for receiving an external signal, the two independent ends are respectively used for feeding the external signal into two phase-shifting transmission lines, each conductor branch comprises a first branch which forms an enclosure space with a gap together with the corresponding symmetric part of the other conductor branch, and a second branch which turns and routes from the tail end of the first branch to the enclosure space within a limited range;

the power distribution network is arranged in a projection range limited by a fixed surface of a metal cavity of the dielectric phase shifter.

14. The dielectric phase shifter of claim 13, wherein the first branch is divided into a first section, a second section and a third section in sequence from the common end, the first section is disposed in parallel with the third section, and the second section is perpendicular to the first section and the third section, respectively.

15. A dielectric phase shifter as recited in claim 13 wherein said second branch extends from said first branch into a first branch and a second branch, said first branch being perpendicular to said second branch.

16. An antenna comprising a radiating array and a dielectric phase shifter according to any one of claims 1-15, wherein the dielectric phase shifter is configured to control phase shifting of signals of the array, and two signals with different phases output after phase shifting are respectively transmitted to corresponding radiating elements.

Technical Field

The invention belongs to the technical field of mobile communication, and particularly relates to a dielectric phase shifter and an antenna provided with the dielectric phase shifter.

Background

With the continuous development of mobile communication networks, users have higher requirements on the performances of the mobile communication networks, such as transmission delay, transmission rate, stability, system capacity and the like, and a fifth generation mobile communication network is produced. At present, a continuously-built 5G communication network is gradually mature and put into commercial use, and a mobile communication base station antenna is used as a main carrier for signal receiving and transmitting in communication, so that the performance of the mobile communication base station antenna directly influences the overall performance of the communication network and the perception experience of users, and plays a crucial role in the mobile communication network.

In a mobile communication network, an electric tuning antenna covers key equipment of the network, and a phase shifter is a core device of the electric tuning antenna. The electrically tunable antenna adjusts the phase distribution of each radiating element in the radiating array through the phase shifter to change the downward inclination angle of the main beam of the antenna, thereby changing the radiation coverage of the antenna and improving the communication quality in the area.

According to the signal transmission requirements of the radiation unit, the phase shifter is required to adjust the phase of the signal fed into the phase shifter in real time according to the phase of the signal required to be transmitted by the radiation unit. Currently, two methods are generally adopted to achieve the phase shift purpose: one is realized by changing the electrical length of a signal transmission path in the phase shifter; the other is to shift the phase by moving the medium in the phase shifter.

In order to perform phase shifting by the two methods, a connecting element is usually disposed at one end of a metal cavity of the phase shifter in the length direction, and a movable transmission line or a dielectric sheet for phase shifting of the phase shifter is connected by the connecting element. The phase shifting purpose of the two phase shifting modes is achieved by pulling the connecting element to further pull the movable transmission line or the medium sheet to change the position in the metal cavity.

However, since the length of the movable transmission line or the dielectric sheet is usually longer, the connection element is arranged in the length direction of the metal cavity to move the movable transmission line or the dielectric sheet, which will cause the effect that the part of the movable transmission line or the dielectric sheet farther away from the connection element is less under the fixed control of the connection element, so that the movable transmission line or the dielectric sheet shakes more and more in the moving process, which causes the fluctuation of signals, thereby causing the interference of the phase shifting precision and affecting the phase shifting performance of the phase shifter.

Disclosure of Invention

A first object of the present invention is to provide a dielectric phase shifter suitable for controlling phase shifting performance.

It is a further object of the present invention to provide an antenna.

The invention is suitable for the purpose of the invention and adopts the following technical scheme:

a first object of the present invention is to provide a dielectric phase shifter, including:

the phase shifting circuit comprises a longitudinal circuit board and a plurality of phase shifting transmission lines arranged on at least one surface of the circuit board;

the medium moving mechanism comprises a clamping moving part and a pair of longitudinal medium clamping plates, the surfaces of the medium clamping plates are opposite to form a clamping space structure for clamping the phase-shifting circuit, and the clamping moving part is respectively connected with the two medium clamping plates;

the metal cavity is provided with a lengthwise cavity for accommodating the phase shift circuit and the medium moving mechanism, a sliding window for exposing the clamping moving part is arranged at the non-tail end position of the metal cavity, the phase shift circuit is fixedly arranged relative to the metal cavity, and the medium moving mechanism is arranged in a sliding mode relative to the metal cavity.

Furthermore, the metal cavity comprises a metal cover and a ground layer arranged on the dielectric plate, the metal cover fixing cover is arranged on the dielectric plate, and the metal cover comprises two opposite side cavity walls and a top cavity wall used for connecting the two side cavity walls.

Furthermore, the sliding window is arranged on the top cavity wall, and two side edges of the sliding window in the longitudinal direction respectively form a sliding rail with the side cavity wall connected with the sliding window for the clamping movable piece to slide.

Furthermore, the medium clamping plate is sunken from the top cavity wall to the medium plate to form a clamping groove for clamping the clamping moving piece.

Furthermore, the clamping moving part comprises sliding arms arranged on two sides and clamping arms arranged between the two sliding arms, a clamping sliding groove is formed between one sliding arm and the adjacent clamping arm, the clamping moving groove accommodates the groove wall of the clamping groove of the corresponding medium clamping plate and the corresponding sliding rail, and the clamping arms extend into the clamping groove.

Preferably, an avoiding gap is formed between the two clamping arms, and the circuit board of the phase-shift circuit can pass through the avoiding gap.

Preferably, the side cavity wall is provided with an elastic limiting bulge facing the medium clamping plate.

Preferably, the bottom of the circuit board of the phase shift circuit is provided with a pin for being inserted into the dielectric plate, the top of the circuit board of the phase shift circuit is provided with a limiting protrusion, and the top cavity wall of the metal cover is provided with a limiting hole corresponding to the limiting protrusion.

Preferably, the medium clamping plate is provided with a notch or an inner groove for realizing impedance matching.

Furthermore, the circuit board is divided into a left side and a right side along a central line perpendicular to the length direction of the circuit board, and the left side and the right side of one side surface of the circuit board are respectively provided with a phase-shifting transmission line.

Furthermore, the left side and the right side of the other side of the circuit board are respectively provided with a phase-shifting transmission line, projections of the phase-shifting transmission lines, which are positioned on the same side, on the two sides of the circuit board in the thickness direction of the circuit board are overlapped, and the two phase-shifting transmission lines, which are overlapped in projection, are electrically connected with each other through a metalized through hole.

Furthermore, the phase-shifting transmission line comprises an input end arranged in the middle of the circuit board and an output end arranged at the tail end of the circuit board, and the input end and the output end are both inserted in the dielectric plate and connected with an external signal feed-in end.

Further, the metal cover fixing cover is arranged on the reverse side of the dielectric plate and forms the metal cavity together with the grounding layer on the reverse side, and a power distribution network is arranged on the front side of the dielectric plate;

the power distribution network comprises a common point end, conductor branches symmetrically arranged on two sides of the common point end and two independent ends formed at the tail ends of the conductor branches on the two sides, wherein the common point end is used for receiving an external signal, the two independent ends are respectively used for feeding the external signal into two phase-shifting transmission lines, each conductor branch comprises a first branch which forms an enclosure space with a gap together with the corresponding symmetric part of the other conductor branch, and a second branch which turns and routes from the tail end of the first branch to the enclosure space within a limited range;

the power distribution network is arranged in a projection range limited by a fixed surface of a metal cavity of the dielectric phase shifter.

Furthermore, the first branch node is sequentially divided into a first section, a second section and a third section from a common point end, the first section and the third section are arranged in parallel, and the second section is respectively vertical to the first section and the third section.

Furthermore, the second branch node extends from the first branch node and is sequentially divided into a first branch and a second branch, and the first branch and the second branch are perpendicular.

The present invention further provides an antenna, which includes a radiation array and the dielectric phase shifter according to the first aspect, wherein the dielectric phase shifter is configured to control a phase of the radiation array, and output two signals with different phases after phase shifting to be respectively transmitted to corresponding radiation units.

Compared with the prior art, the invention has the following advantages:

the sliding window is arranged at the non-tail end position of the metal cavity, so that the clamping moving part can move the pair of medium clamping plates to implement phase shifting without connecting the end positions of the pair of medium clamping plates, the far end of the medium clamping plate is not far away from the clamping moving part, the vibration of the medium clamping plate can be controlled by the clamping moving part, the internal electrical performance of the medium phase shifter is stable, the severe up-and-down fluctuation of the electrical performance caused by the sliding of the medium clamping plate is avoided, the medium clamping plate is in stable transition, and the medium clamping plate of the medium phase shifter is in stable transition when in phase shifting, so that the phase shifting performance of the medium phase shifter is stable.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a common power distribution network.

Fig. 2 is a schematic structural diagram of a power distribution network of the phase shifting device of the present invention.

FIG. 3 is a schematic structural diagram of a phase shifter according to the present invention.

FIG. 4 is an exploded view of the phase shifting device of the present invention.

FIG. 5 is a schematic view of the structure of a metal cover of the phase shifter of the present invention.

FIG. 6 is a schematic diagram showing the structure of a dielectric clamping plate of the phase shifter of the present invention.

FIG. 7 is a schematic diagram of a phase shift circuit of the phase shift device of the present invention.

FIG. 8 is a schematic view of the structure of the clamping moving member of the phase shifting device of the present invention.

FIG. 9 is a schematic view of the back surface of a dielectric plate of the phase shift device of the present invention.

FIG. 10 is a simulated standing wave pattern for a phase shifting device of the present invention.

FIG. 11 is a graph of simulated losses for a phase shifting device of the present invention.

FIG. 12 is a phase diagram of the simulation of two signal ports of the phase shifting device when the phase shifting device of the present invention shifts the phase and the clamping moving member is located in the middle of the sliding window.

FIG. 13 is a phase diagram of simulation of two signal ports of the phase shifting device when the phase shifting device of the present invention shifts the phase and the clamping moving element is respectively located at two ends of the sliding window.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for the purpose of illustrating the present invention and are not to be construed as limiting the present invention.

As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. As used herein, the term "and/or" includes all or any element and all combinations of one or more of the associated listed items.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The invention provides a phase-shifting device 10, and a power distribution network 30 provided by the invention is adopted in the phase-shifting device 10, so that the phase-shifting device 10 has a smaller volume; and the phase shifter 10 adopts the dielectric phase shifter 20 provided by the invention, so that the phase shifter 10 can stably perform phase shifting and has better phase shifting performance.

In an exemplary embodiment of the present invention, referring to fig. 2 and fig. 3, the phase shifting apparatus 10 includes a dielectric phase shifter 20 and a power dividing network 30, the power dividing network 30 is configured to feed a signal to the dielectric phase shifter 20, and the dielectric phase shifter 20 is configured to shift the phase of the fed signal.

With reference to fig. 3 and 4, the dielectric phase shifter 20 includes a phase shift circuit 21, a dielectric moving mechanism, and a metal cavity 23, and the phase shift circuit 21 and the dielectric moving mechanism are disposed in the metal cavity 23.

The metal cavity 23 includes a metal cover 231 and a ground layer 2322 disposed on the reverse side of the dielectric board 232, the metal cover 231 is fixedly covered on the ground layer 2322, so that the metal cover 231 and the ground layer 2322 jointly define the metal cavity 23, and the metal cavity 23 extends along the length direction of the dielectric board 232, so that the metal cavity 23 can provide a longitudinal cavity for accommodating the phase shift circuit 21 and the dielectric moving mechanism.

Referring to fig. 5, the metal cover 231 includes two facing side cavity walls 2311 and a top cavity wall 2312 for connecting the two side cavity walls 2311. A plurality of fixing pins 2313 are arranged on the side cavity wall 2311, and fixing holes 2321 for inserting the fixing pins 2313 are correspondingly arranged on the dielectric slab 232, so that the metal cover 231 is fixedly inserted on the dielectric slab 232. The side cavity wall 2311 is further provided with a folded angle 2314, the folded angle 2314 is parallel to the dielectric plate 232, the folded angle 2314 is attached to the dielectric plate 232, and the folded angle 2314 and the dielectric plate 232 are fixed in a welding or threaded connection mode.

A sliding window 2315 is formed in the top cavity wall 2312 along the longitudinal direction of the metal cavity, and the sliding window 2315 is used for enabling the medium moving mechanism to slide on an extending path of the sliding window 2315 so as to change the medium distribution of the medium phase shifter 20 and further implement phase shifting. The two longitudinal sides of the sliding window 2315 and the side cavity wall 2311 connected with the sliding window respectively form sliding rails 2316, and the sliding rails 2316 are used for the sliding of the medium moving mechanism. The sliding window 2315 may be provided on the side chamber wall 2311 or the top chamber wall 2312 depending on the arrangement of the media activation mechanism. Further, the sliding window 2315 may be disposed at the middle or left or right side of the side cavity wall 2311, and the sliding window 2315 may be disposed at the middle or left or right side of the top cavity wall 2312. In an exemplary embodiment of the present invention, the sliding window 2315 is disposed in the top cavity wall 2312. With reference to fig. 4, the medium moving mechanism includes a clamping moving member 221 and a pair of lengthwise medium clamping plates 222, the clamping moving member 221 is connected to the pair of medium clamping plates 222, and the clamping moving member 221 can drive the pair of medium clamping plates 222 to move along the length direction of the metal cavity 23.

The pair of dielectric clamping plates 222 are disposed in the metal cavity 23, the two dielectric clamping plates 222 face each other and are parallel to each other, a clamping space 2221 is disposed between the two dielectric clamping plates 222, the clamping space 2221 is used for accommodating the phase shift circuit 21, and a width of the clamping space 2221 (a direction perpendicular to a length direction of the metal cavity 23) is greater than a width of the phase shift circuit 21, so that when the two dielectric clamping plates 222 slide, the dielectric clamping plates 222 do not affect a fixed setting of the phase shift circuit 21, and do not drive the phase shift circuit 21 to move. The dielectric clamping plate 222 extends along the extending direction of the metal cavity 23, and the height of the dielectric clamping plate 222 (the thickness direction of the dielectric plate 232) is smaller than the height of the metal cavity 23. Because the metal cavity 23 is provided with the sliding window 2315, the tops of the two medium clamping plates 222 are exposed to the outside through the sliding window 2315, so that the clamping movable piece 221 can be connected with the two medium clamping plates 222 through the sliding window 2315.

The length of the medium clamping plate 222 is shorter than that of the metal cavity 23, and the medium clamping plate 222 moves in the metal cavity 23 along the length direction of the metal cavity 23. When the two ends of the metal cavity 23 in the length direction are not closed, if necessary, one end of the medium clamp plate 222 may extend out of the metal cavity 23 through the openings at the two ends of the metal cavity 23 in the length direction. Preferably, the length of the dielectric clamping plate 222 is one half or one third or one quarter of the length of the metal cover 231.

Referring to fig. 6, the medium clamping plate 222 further has a clamping groove 2222, and the clamping groove 2222 is formed by being recessed from the top (top cavity wall 2312 direction) of the medium clamping plate 222 to the bottom (medium plate 232 direction) of the medium clamping plate 222. The holding groove 2222 has at least one groove wall 2223, the groove wall 2223 is close to the side cavity wall 2311 adjacent to the medium clamping plate 222, and the groove wall 2223 is matched with the slide rail 2316, so that the movable member 221 is held while the groove wall and the slide rail 2316 are held, and the medium clamping plate 222 is driven to slide.

In one embodiment, the dielectric chuck 222 is provided with a notch (not shown) and/or an internal groove 2224, the notch and internal groove 2224 being used for impedance matching. The notch may be provided at the top or bottom of the media clamp 222. The interior slots 2224 may be provided on the sides of the media clamp 222. Multiple inner slots 2224 of different sizes may be provided on each side to improve impedance matching and to extend bandwidth.

The clamping movable piece 221 is disposed at the sliding window 2315, and at the sliding window 2315, the clamping movable piece 221 simultaneously clamps the two medium clamping plates 222 and slides along the sliding rail 2316, so as to change the medium distribution position of the medium phase shifter 20.

When the sliding window 2315 is disposed on the top cavity wall 2312 of the metal cover 231, the sliding window 2315 may be disposed at the middle, left side or right side of the length direction of the top cavity wall 2312 corresponding to the clamping movable member 221, so that the dielectric phase shifter 20 may control the distribution position of the dielectric clamping plates 222 in the metal cavity 23, thereby controlling the phase shifting performance of the dielectric phase shifter 20. When the sliding window 2315 is disposed at the middle position of the top cavity wall 2312 in the length direction, the sliding window 2315 is symmetrically disposed along the central line thereof (the central line is perpendicular to the length direction of the sliding window 2315), so that the clamping moving member can be disposed at the middle of the metal cavity 23.

With reference to fig. 8, the clamping moving member 221 includes a sliding arm 2211 disposed on both sides and a clamping arm 2213 disposed between the two sliding arms 2211, and the two sliding arms 2211 and the two clamping arms 2213 are sequentially disposed along the width direction of the metal cavity. A clamping sliding groove 2214 is formed between one sliding arm 2211 and the adjacent clamping arm 2213, and the clamping sliding groove 2214 can accommodate the groove wall 2223 of the clamping groove 2222 of one medium clamping plate 222 and the sliding rail 2316 of the metal cavity, so that the clamping movable member 221 can clamp one medium clamping plate 222. Therefore, the clamping movable member 221 forms two clamping sliding grooves 2214, and the two clamping sliding grooves 2214 respectively drive one medium clamping plate 222 to slide along the extending direction of the sliding window 2315, so that the two medium clamping plates 222 synchronously slide.

Specifically, the sliding arm 2211 holding the sliding groove 2214 is disposed outside the metal cavity 23, and the sliding arm 2211 is disposed on the sliding rail 2316, so that the sliding arm 2211 can move along the sliding rail 2316; the clamping arm 2213 of the clamping sliding slot 2214 extends into the metal cavity 23 through the sliding window 2315, the clamping arm 2213 can extend into the clamping slot 2222 of the medium clamping plate 222 in the metal cavity 23, and the clamping arm 2213 is far away from the corresponding sliding rail 2316 compared with the slot wall 2223 of the corresponding clamping slot 2222, so that the clamping sliding slot 2214 formed by the clamping arm 2213 and the sliding arm 2211 can simultaneously clamp the sliding rail 2316 and the slot wall 2223 of the clamping slot 2222, and the medium clamping plate 222 is driven to slide along the sliding rail 2316.

The clamping sliding groove 2214 accommodates one medium clamping plate 222 and the sliding rail 2316 adjacent to the medium clamping plate 222, and the two clamping sliding grooves 2214 of the clamping moving member 221 can respectively slide along the sliding rails 2316 on the two sides of the sliding window 2315, so that the clamping sliding grooves 2214 can drive the two medium clamping plates 222 to slide along the extending direction of the sliding window 2315, thereby changing the medium distribution of the medium phase shifter 20 and further outputting signals with different phases.

An avoiding gap 2215 is formed between the two clamping arms 2213 of the clamping moving piece 221, the avoiding gap 2215 is used for avoiding the phase shift circuit 21, when the clamping moving piece 221 drives the two medium clamping plates 222 to slide, the phase shift circuit 21 can be avoided through the avoiding gap 2215, and the phase shift circuit 21 cannot block the movement of the clamping moving piece 221.

The clamping movable member 221 further includes a driving portion 2216, the driving portion 2216 is disposed on the two sliding arms 2211 and the two clamping arms 2213, and an external force applying end can apply force to the clamping movable member 221 by connecting the driving portion 2216, so as to drive the clamping movable member 221 to move, and further drive the two medium clamping plates 222 to slide.

Referring to fig. 7, the phase shift circuit 21 includes a circuit board 211 having a longitudinal shape and a plurality of phase shift transmission lines 212 disposed on the circuit board 211.

The circuit board 211 is disposed in the clamping space 2221 formed by the two medium clamping plates 222 and the avoiding gap 2215 formed on the clamping movable member 221, so that the circuit board 211 can be fixedly disposed in the metal cavity 23. The bottom of the circuit board 211 is provided with a plug pin 213 for plugging in the dielectric plate 232, and the dielectric plate 232 is provided with a plug hole corresponding to the plug pin 213 for limiting; the top of the circuit board 211 is provided with a limiting protrusion 214, and the metal cover 231 is provided with a limiting hole 2317 corresponding to the limiting protrusion 214, so that the circuit board 211 is inserted into the limiting hole 2317 through the limiting protrusion 214 for limiting; the circuit board 211 can be stably fixed in the metal cavity 23 by the plug pins 213 and the limiting protrusions 214 on the circuit board 211.

The phase-shifting transmission line 212 is at least arranged on at least one surface of the circuit board 211, and external current flows into the phase-shifting transmission line 212, and moves the two dielectric clamping plates 222 positioned on the two sides of the circuit board 211 through the clamping movable piece 221, so that the dielectric distribution in the dielectric phase shifter 20 is changed, and the phase of a signal fed into the phase-shifting transmission line 212 is shifted.

In an exemplary embodiment of the present invention, the phase shift circuit 21 includes two phase shift transmission lines 212. The two phase-shift transmission lines 212 are respectively located on the left and right sides of one side of the circuit board 211 (the circuit board 211 is divided into the left and right sides along a virtual center line perpendicular to the length direction of the circuit board 211), and the two phase-shift transmission lines 212 are symmetrically arranged along the center line.

The feeding terminals 2121 of the two phase-shifting transmission lines 212 are both disposed close to the neutral line, the feeding terminal 2121 is electrically connected to the power distribution network 30 disposed on the dielectric board 232 through the circuit board 211, and the power distribution network 30 feeds a signal to the feeding terminal 2121 of the phase-shifting transmission line 212. The circuit board 211 is provided with a feeding pin 2122 corresponding to the feeding end 2121 of the phase-shift transmission line 212, the feeding pin 2122 is inserted into the independent end 31 of the power dividing network 30 disposed on the dielectric board 232, and the independent end 31 is a signal output port of the power dividing network 30, so that a signal on the power dividing network 30 is fed into the phase-shift transmission line 212 through the feeding end 2121.

The phase-shifting transmission line 212 extends from the middle of the circuit board 211 to the end of the circuit board 211 corresponding to the phase-shifting transmission line 212, the output end 2123 of the phase-shifting transmission line 212 is located at the end of the circuit board 211 corresponding to the phase-shifting transmission line 212, and the output end 2123 extends to the dielectric plate 232 through the circuit board 211, and outputs a phase-shifted signal to the outside through the dielectric plate 232. The circuit board 211 is provided with an output pin 2124 corresponding to the output end 2123 of the phase-shift transmission line 212, and the output pin 2124 is inserted into the dielectric plate 232 to facilitate the output of the signal of the phase-shift transmission line 212. For example, the phase-shifted transmission line 212 on the left side of one side of the circuit board 211 extends from a feeding end 2121 near the center line to an output end 2123 on the left side of the side to form a complete phase-shifted transmission line 212.

To facilitate the resolution of the two phase-shifting transmission lines 212, the phase-shifting transmission line 212 disposed on the left side of one side of the circuit board 211 is referred to as a first phase-shifting transmission line 2125, the phase-shifting transmission line 212 disposed on the right side of the first phase-shifting transmission line 2125 is referred to as a second phase-shifting transmission line 2126, and the first phase-shifting transmission line 2125 and the second phase-shifting transmission line 2126 are symmetrically disposed along the center line. Referring to fig. 9, the first phase-shifted transmission line 2125 and the second phase-shifted transmission line 2126 are respectively connected to an independent terminal 31 of the power dividing network 30, the independent terminal 31 connected to the first phase-shifted transmission line 2125 is referred to as a first independent terminal 311, the independent terminal 31 connected to the second phase-shifted transmission line 2126 is referred to as a second independent terminal 312, and the first independent terminal 311 and the second independent terminal 312 are different independent terminals 31. In an exemplary embodiment of the present invention, the signal fed from the first isolated terminal 311 to the first phase-shifted transmission line 2125 is the same as the signal fed from the second isolated terminal 312 to the second phase-shifted transmission line 2126.

In the dielectric phase shifter 20, moving the dielectric clamping plate 222 will change the phase of the signal flowing through the dielectric phase shifter 20. Specifically, the dielectric phase shifter 20 of the present invention includes two independent phase-shifting transmission lines 212, the two phase-shifting transmission lines 212 are respectively fed with signals from two different independent ends 31 of the power dividing network 30, and the two dielectric clamping plates 222 are clamped by the clamping moving member 221 and move the two dielectric clamping plates 222, so as to relatively change the phases of the signals fed into the two phase-shifting transmission lines 212. The equivalent dielectric constant of each position in the metal cavity 23 is changed by clamping the movable element 221 and moving the two dielectric clamping plates 222, so that the propagation rate of the signals fed into the two phase-shifting transmission lines 212 is changed, the phases of the signals flowing through the two phase-shifting transmission lines 212 are relatively changed, and the phase difference of the two output signals is generated.

When the clamping moving element 221 drives the two dielectric clamping plates 222 to be disposed at the center of the metal cavity 23, the equivalent dielectric constants at the left and right sides of the circuit board 211 are equal, so that the propagation rates of the signals on the first phase-shifting transmission line 2125 and the second phase-shifting transmission line 2126 are the same, and the phase of the signal output by the first phase-shifting transmission line 2125 is the same as the phase of the signal output by the second phase-shifting transmission line 2126.

When the clamping moving element 221 drives the two dielectric clamping plates 222 to move to the left side of the sliding window 2315, most of the two dielectric clamping plates 222 are located at the left side of the metal cavity 23, so that the equivalent dielectric constant at the left side of the circuit board 211 is larger than that at the right side of the circuit board 211, and the propagation rates of signals on the first phase-shifting transmission line 2125 and the second phase-shifting transmission line 2126 are relatively changed, so that the phase of the signal output by the first phase-shifting transmission line 2125 is different from the phase of the signal output by the second phase-shifting transmission line 2126.

Regarding the phase shift principle when the clamping moving member 221 drives the two medium clamping plates 222 to move to the right side of the sliding window 2315, the phase shift principle can be analogized when the clamping moving member 221 drives the two medium clamping plates 222 to move to the left side of the sliding window 2315, which is not described herein for brevity.

Referring to fig. 10, in a wide frequency band from 3.3GHz to 4.2GHz, when the clamping moving element 221 of the phase shifter 10 drives the two dielectric clamping plates 222 to travel for 2mm, the standing-wave ratio is less than 1.25. Referring to fig. 11, when the clamping moving member 221 of the phase shifting device 10 drives the two medium clamping plates 222 to travel 2mm each time, the total loss is less than 0.8 dB. Referring to fig. 12, when the clamping moving member 221 of the phase shifting device 10 drives the two medium clamping plates to be located in the middle of the metal cavity 23, the phase shifting device 10 has high balance degree to the phases output from the two ends. Referring to fig. 13, when the clamping moving member 221 of the phase shifting device 10 drives the two medium clamping plates to be respectively located at the two ends of the metal cavity 23, the phase shifting device 10 has high balance degree to the phase outputted from the two ends. Therefore, the phase shifting device 10 can realize low standing wave, high amplitude consistency, low loss and large phase shifting quantity of 180 degrees in a wide frequency band of 3.3GHz-4.2GHz, has very compact size, can be applied to a 5G antenna system, and reduces the size and the weight of an antenna.

In one embodiment, the circuit board 211 has a first face 2111 on a side where the first phase-shift transmission line 2125 and the second phase-shift transmission line 2126 are provided, and a second face on a side opposite to the first face 2111. The left and right sides of the second surface of the circuit board 211 are respectively provided with a phase-shifting transmission line 212, the phase-shifting transmission line 212 arranged on the right side of the second surface is referred to as a third phase-shifting transmission line (not shown), the phase-shifting transmission line 212 arranged on the left side of the second surface is referred to as a fourth phase-shifting transmission line (not shown), and the third phase-shifting transmission line and the fourth phase-shifting transmission line are symmetrical relative to the central line.

A projection of the first phase-shift transmission line 2125 provided on the first surface 2111 of the circuit board 211 in the thickness direction of the circuit board 211 coincides with a projection of the third phase-shift transmission line provided on the second surface of the circuit board 211 in the thickness direction of the circuit board 211; the projection of the second phase-shift transmission line 2126 disposed on the first surface 2111 of the circuit board 211 in the thickness direction of the circuit board 211 coincides with the projection of the fourth phase-shift transmission line disposed on the second surface of the circuit board 211 in the thickness direction of the circuit board 211. That is, the first phase-shifting transmission line 2125 and the third phase-shifting transmission line are located at the same position in the projection direction of the circuit board 211, and have the same shape and size; the second phase-shift transmission line 2126 and the fourth phase-shift transmission line are located at the same position in the projection direction of the circuit board 211, and have the same shape and size.

In order to enhance the phase shifting effect of the dielectric phase shifter 20, a plurality of metallized through holes 2113 are uniformly formed at the positions where the first phase-shifting transmission line 2125 and the third phase-shifting transmission line of the circuit board 211 are located, so that the first phase-shifting transmission line 2125 and the third phase-shifting transmission line are conducted with each other, and the first phase-shifting transmission line 2125 and the third phase-shifting transmission line form a first phase-shifting shunt with stronger conductivity; a plurality of metallized through holes 2113 are formed at the positions of the second phase-shifting transmission line 2126 and the fourth phase-shifting transmission line of the circuit board 211, so that the second phase-shifting transmission line 2126 and the fourth phase-shifting transmission line are conducted with each other, and the second phase-shifting transmission line 2126 and the fourth phase-shifting transmission line form a second phase-shifting shunt with stronger conductive capability. The phase shifting principle of the first phase shifting branch and the second phase shifting branch disposed on the circuit board 211 is the same as the phase shifting principle of the first phase shifting transmission line 2125 and the second phase shifting transmission line 2126 disposed on the circuit board 211, and therefore, for brevity, no further description is provided.

In one embodiment, the dielectric phase shifter 20 has a plurality of phase shift circuits 21, and a plurality of clamping spaces may be provided between two dielectric clamping plates 222 for respectively accommodating the circuit boards 211 of the plurality of phase shift circuits 21.

In one embodiment, referring to fig. 5, the side cavity wall 2311 of the metal cover 231 is further provided with an elastic limit protrusion 2318 facing the adjacent medium clamping plate 222. When the medium clamping plate 222 moves towards the direction of the adjacent side cavity wall 2311, the movement of the medium clamping plate 222 can be limited through the elastic limiting protrusion 2318, the elastic limiting protrusion 2318 has an elastic effect, and when the elastic limiting protrusion 2318 limits the medium clamping plate 222, hard contact cannot be generated, so that damage to the side cavity wall 2311 cannot be generated, the medium clamping plate can be ensured to clamp the phase-shifting circuit board all the time, and the phase consistency between the phase shifters is improved. Preferably, the elastic limiting protrusion 2318 is an elastic sheet formed by hollowing out the side cavity wall 2311. Forming the elastic sheet by hollowing the side cavity wall 2311 can avoid adding new parts on the side cavity wall 2311, avoid increasing the volume of the metal cavity 23, and facilitate the miniaturization of the dielectric phase shifter 20.

The metal cavity 23, the phase shift circuit 21 and the dielectric moving mechanism are disposed on the back surface 2323 of the dielectric board 232, the back surface 2323 of the dielectric board 232 is coated with copper to form a ground layer, and the power distribution network 30 is disposed on the front surface 2324 of the dielectric board 232. The area of the metal cover 231 covered on the back surface 2323 of the dielectric slab 232 is a fixed surface, the projection of the fixed surface on the front surface 2324 of the dielectric slab 232 is a fixed projection surface, and the power distribution network 30 is arranged in the fixed projection surface, so as to realize the miniaturization of the phase shifting device 10.

With reference to fig. 2, the power distribution network 30 includes a common point end 32, a conductor branch 33 symmetrically disposed on both sides of the common point end 32, and two independent ends 31 formed at the ends of the conductor branch 33. The common node 32 is used for receiving external signals, and the two independent nodes 31 are used for feeding signals to the two phase-shifting transmission lines 212, respectively.

The conductor branch 33 includes a first branch 331 and a second branch 332, the first branch 331 extends from the common point end 32 to the second branch 332, and the second branch 332 extends from the end of the first branch 331 to the independent end 31.

In an exemplary embodiment of the invention, the power distribution network 30 includes two conductor branches 33, and the two conductor branches 33 are respectively called a first conductor branch 333 and a second conductor branch 334. Each conductor branch 33 includes a first branch 331 and a second branch 332.

First branch 3331 of first conductor branch 333 and first branch 3341 of second conductor branch 334 are symmetrical to each other, and first branch 3331 of first conductor branch 333 and first branch 3341 of second conductor branch 334 enclose an enclosure space with a gap. The surrounding space is of a symmetrical structure. Preferably, the enclosure space has a regular shape or an irregular shape such as a rectangular shape, a circular shape, an elliptical shape, or a triangular shape.

The surrounding space is disposed in the fixed projection plane, so that the two conductor branches 33 of the power distribution network 30 can be disposed in the projection range of the metal cover 231 in the thickness direction of the dielectric plate 232, the coverage range of the power distribution network 30 is limited by the fixed projection plane, and the miniaturization of the phase shift device 10 can be realized. The coverage area of the enclosure space defined by the power distribution network 30 is the maximum coverage area of the power distribution network 30, so that the enclosure space with the gap is formed by the first branch 3331 of the first conductor branch 333 and the first branch 3341 of the second conductor branch 334 which are matched with each other, which is convenient to define the coverage area of the power distribution network 30, and control the extension area of the power distribution network 30, so as to control the range of the dielectric plate 232 occupied by the power distribution network 30, and further realize the miniaturization of the phase shift device 10.

In general, the coverage of a conventional power distribution network in the art exceeds the projection of the metal cap on the front surface of the dielectric plate. Referring to fig. 1, fig. 1 shows an extended coverage path of a power dividing network 80 of a conventional phase shifter, 81 is a projection 81 of a metal cavity of a phase shifter of the phase shifter on a front surface of a dielectric plate. Therefore, it can be seen that the length direction of the metal cavity is the same as the length direction of the dielectric plate, the power distribution network 80 is disposed along the width direction of the metal cavity, and the width and length of the power distribution network 80 are much greater than the width of the metal cavity. Therefore, even though the metal cavity of the phase shifter for accommodating the electrical component is made more flat by those skilled in the art, since the power distribution network 80 is disposed perpendicular to the metal cavity, the phase shifter needs to leave a dielectric plate with a certain area for arranging the power distribution network 80, and thus the volume of the phase shifter cannot be reduced.

Furthermore, the symmetrical first branches 331 of the two conductor branches 33 of the power distribution network 30 of the phase shift device 10 of the present invention together form an enclosure space with a gap, the enclosure space is within the projection range defined by the fixing surface of the metal cavity 23, and the remaining extension lines of the power distribution network 30 except the enclosure space are all within the enclosure space, so that the coverage range of the power distribution network 30 is within the projection range defined by the fixing surface of the metal cavity 23, and the coverage range of the power distribution network 30 does not exceed the projection range defined by the fixing surface of the metal cavity 23, so that the extension range of the power distribution network 30 is limited, thereby facilitating the miniaturization of the power distribution network, and further miniaturizing the phase shift device 10.

The power dividing network 30 of the phase shifting device 10 of the present invention forms an enclosure space with a gap by the symmetrical first branches 331 of the two conductor branches 33, the remaining extension lines of the power dividing network 30 are disposed in the enclosure space, and the electrical performance of the power dividing network 30 will not be affected by disposing the extension lines in the enclosure space.

The surrounding space of the power distribution network 30 of the phase shifting device 10 of the present invention may be within a projection range defined by a fixing surface of the metal cavity 23, the fixing surface is arranged along the length direction of the metal cavity 23, and the surrounding space of the power distribution network 30 may be extended along the length direction of the fixing surface, so that an extended line with a certain length may be arranged in the surrounding space.

In the exemplary embodiment of the invention, the first branch 331 is divided into a first segment 3311, a second segment 3312 and a third segment 3313 in sequence from the common end 32. Preferably, the first, second and third segments 3311, 3312 and 3313 are linear segments, the first and third segments 3311, 3313 are parallel to each other, and the second and third segments 3312, 3311 and 3313 are perpendicular to each other. In some embodiments, the first, second, and third segments 3311, 3312, 3313 may also be curved segments.

Third section 3334 of first section 3331 of first conductor section 333 is opposite to third section 3344 of first section 3341 of second conductor section 334, so that first conductor section 333 and second conductor section 334 form a rectangular enclosure space with a gap. The rectangular surrounding space is disposed in the fixed projection plane, so that the two conductor branches 33 of the power dividing network 30 can be disposed in the space within the projection range of the metal cover 231, which facilitates miniaturization of the phase shifting device 10.

In one embodiment, the first branch 331 further has a winding portion (not shown) thereon, which is wavy or pulse-wave shaped, so as to extend the length of the first branch 331, thereby facilitating the branching operation of the power dividing network 30. Preferably, the wrap around portion may be disposed on the first branch 3311 and/or the second branch 3312 of the first branch 331.

In one embodiment, the first branch 331 further has a matching portion (not shown) for impedance matching, and the width of the matching portion is different from the width of the other portions of the first branch. The matching portion may be disposed on the first segment 3311 and/or the second segment 3312 and/or the third segment 3313 of the first segment 331.

In one embodiment, the end of the third section 3334 of the first section 3331 of the first conductor section 333 and the end of the third section 3344 of the first section 3341 of the second conductor section 334 are connected in series with an isolation resistor 34. Preferably, the isolation resistor 34 is a 100 ohm resistor.

The second branch 332 extends from the end of the first branch 331 toward the inside of the enclosure. The second branches 332 may have a regular shape or an irregular shape. In some embodiments, the second branch 332 has a rectangular shape, a circular shape, or an elliptical shape.

The second branch 332 is bent and routed to the enclosed space with the notch defined by the first branch 3331 of the first conductor branch 333 and the first branch 3341 of the second conductor branch 334 through the end of the first branch 331, so that the remaining extension circuits of the power distribution network 30 except the first branch 331 are all disposed in the enclosed space, thereby controlling the size of the coverage area of the dielectric plate 232 occupied by the power distribution network 30 without affecting the overall wiring of the power distribution network 30, improving the space utilization rate of the power distribution network 30, and facilitating the miniaturization of the power distribution network 30.

In an exemplary embodiment of the invention, the second branch 332 comprises a first branch 3321 and a second branch 3322, the first branch 3321 is perpendicular to the third branch 3313 of the first branch 331, and the second branch 3322 is parallel to the third branch 3313 of the first branch 331. The first branch 3321 and the second branch 3322 are linear segments.

The first branch 3336 of the second branch 3335 of the first conductor branch 333 and the first branch 3346 of the second branch 3345 of the second conductor branch 334 are parallel to each other and have the same orientation, and the second branch 3337 of the second branch 3335 of the first conductor branch 333 and the second branch 3347 of the second branch 3345 of the second conductor branch 334 have the same or different orientations.

Preferably, the second section 3337 of the second branch 3335 of the first conductor branch 333 and the second section 3347 of the second branch 3345 of the second conductor branch 334 are oriented in the same direction, so that the first independent end 311 at the end of the second section 3337 of the second branch 3335 of the first conductor branch 333 and the second independent end 312 at the end of the second section 3347 of the second branch 3345 of the second conductor branch 334 can be adjacently disposed, so that the feeding end 2121 of the first phase-shift transmission line 2125 and the feeding end 2121 of the second phase-shift transmission line 2126 on the circuit board 211 which are adjacent to each other can be respectively connected to the two independent ends 31, thereby facilitating the wiring of the two phase-shift transmission lines 212 on the circuit board 211 and the power distribution network 30 on the front surface 2324 of the dielectric board 232, and improving the integration degree of the phase-shift device 10.

In one embodiment, the second branch 332 may also be provided with a winding portion, and the winding portion is wavy or pulse-wave shaped, so as to extend the length of the second branch 332, thereby facilitating the branch operation of the power dividing network 30. Preferably, the winding portion may be disposed on the first branch 3321 and/or the second branch 3322 of the second branch 332.

It can be seen that the power distribution network 30 implemented by the present invention is a special-shaped wilkinson power divider.

The dielectric phase shifter and the power division network of the phase shifting device of the present invention can be used independently, and thus, a dielectric phase shifter and a power division network are disclosed in the above paragraphs, which is for brevity and will not be described again.

In one embodiment, the power dividing network may also be used as a combiner, two independent ends of the power dividing network are used as signal input ports of the combiner, and a common point end of the power dividing network is used as a signal output port of the combiner, so that the power dividing network of the present invention may be used as a combiner.

The invention also provides an antenna which comprises a radiation array arranged on the front surface of the antenna reflector plate and a plurality of phase shifting devices arranged on the back surface of the antenna reflector plate. The radiation array comprises a plurality of radiation units, each phase shifting device correspondingly controls the phase shifting of a polarization signal of one radiation unit, the phase shifting device divides a signal fed into the phase shifting device into two paths of signals through a power distribution network, the two paths of signals are respectively input into phase shifting transmission lines of corresponding dielectric phase shifters, the phase shifting transmission lines shift the phase of the input signals, and therefore two signals with a certain phase difference are output, and the signals are respectively output to the radiation units.

A plurality of radiation units of the radiation array are regularly and compactly arranged on the front surface of the antenna reflecting plate, the range of the front surface of the antenna reflecting plate covered by the radiation units is a mounting surface, the projection on the back surface of the reflecting plate is a mounting projection surface, and the phase shifting device corresponding to the radiation units is arranged on the mounting projection surface.

The invention also provides a base station comprising the antenna.

In summary, the phase shifting apparatus of the present invention includes a dielectric phase shifter and a power dividing network. The top side wall of the metal cover of the medium phase shifter is provided with the sliding window, and the clamping moving part is arranged on the sliding window, so that the medium clamping plate can be controlled to move from the sliding window through the clamping moving part instead of being arranged in the extending direction of the metal cover, the medium clamping plate can be stably pulled by the clamping moving part arranged on the sliding window, and the problem of inaccurate phase shifting caused by shaking can be avoided.

The power division network limits the coverage range of the power division network by limiting the extension range of the power division network in an enclosed space with a gap, which is defined by the first medium of the first conductor branch and the first branch of the second conductor branch, so that the phase shift device is convenient to miniaturize.

The foregoing description is only exemplary of the preferred embodiments of the invention and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention according to the present invention is not limited to the specific combination of the above-mentioned features, but also encompasses other embodiments in which any combination of the above-mentioned features or their equivalents is possible without departing from the scope of the invention as defined by the appended claims. For example, the above features and (but not limited to) features having similar functions of the present invention are mutually replaced to form the technical solution.

Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.