阅读说明：本技术 一种小型化滤波器 (Miniaturized filter ) 是由 李敦穁 尹泽 谢瑞华 杨岳 于 2018-05-30 设计创作，主要内容包括：本发明揭示了一种小型化滤波器,包括一箱体和设置在箱体上的至少两个信号端,所述箱体内沿其纵向设置有至少两层与信号端进行信号传输的谐振单元,相邻两层谐振单元之间设置有屏蔽墙,每层谐振单元包括多个竖向固定于箱体内的谐振结构,所述谐振结构中至少有两个是一体成型的。本发明实现在有限微小空间中方便设计带外抑制零点。(The invention discloses a miniaturized filter, which comprises a box body and at least two signal ends arranged on the box body, wherein at least two layers of resonance units which are used for signal transmission with the signal ends are arranged in the box body along the longitudinal direction of the box body, a shielding wall is arranged between two adjacent layers of resonance units, each layer of resonance unit comprises a plurality of resonance structures which are vertically fixed in the box body, and at least two of the resonance structures are integrally formed. The invention realizes the convenient design of the out-of-band rejection zero point in the limited micro space.)

1. A miniaturised filter characterised in that it comprises:

a box body;

at least two signal terminals arranged on the box body;

at least two layers of resonance units which respectively transmit signals with the at least two signal ends are arranged in the box body along the longitudinal direction of the box body; and

the shielding wall is arranged between two adjacent layers of resonance units, and at least one first opening hole for coupling the two adjacent layers of resonance units and at least one second opening hole for generating a transmission zero point of the miniaturized filter are formed in the shielding wall.

2. The miniaturized filter of claim 1 wherein each of the at least two layers of resonator elements comprises a plurality of resonator structures vertically fixed within a housing. At least two of the resonant structures are integrally formed.

3. The miniaturized filter of claim 1, wherein the connected resonant structures are connected by a connecting rod, the connecting rod is integrally formed with the resonant structures, coupling occurs between two adjacent resonant structures in the connected resonant structures in the same layer, and there is no coupling relationship between the non-connected resonant structures in the same layer.

4. The miniaturized filter of claim 1 wherein the resonating structure comprises a vertically disposed long resonating arm and a short resonating arm, and a connecting portion connecting the long resonating arm and the short resonating arm, wherein the length of the long resonating arm is greater than the length of the short resonating arm.

5. The miniaturized filter of claim 4 wherein a lower end of a part or all of the resonating short arms is formed with a bent portion bent in a direction close to the resonating long arm.

6. The miniaturized filter of claim 4 wherein the resonant long arm, the resonant short arm and the connecting portion are connected in or near an H-shaped resonant structure.

7. The miniaturized filter of claim 4 wherein tuning grooves are formed among the top of the long resonant arm, the connecting portion and the top of the short resonant arm, and the box is provided with a plurality of tuning screws extending into the tuning grooves, and each tuning groove corresponds to one tuning screw.

8. The miniaturized filter of claim 1, wherein the shielding wall is vertically disposed in the box body, and an end portion of the shielding wall is integrally formed with or fixedly attached to an inner wall of the box body.

9. The miniaturized filter of claim 1 or 8 wherein the housing is further provided with a coupling adjusting screw extending into the first opening.

10. The miniaturized filter of claim 1, 8 or 9 wherein the housing is further provided with a zero-point coupling tuning screw extending into the second opening.

11. The miniaturized filter of claim 1 wherein a coupling gap is formed between two adjacent resonant structures in each layer, and a plurality of coupling tuning screws extending into the coupling gap are disposed on the housing, and each coupling gap corresponds to one coupling tuning screw.

Technical Field

The invention relates to a filter, in particular to a miniaturized filter.

Background

With the development of communication technology, the volume requirement of customers is more and more demanding. The resonator and the suppression zero point are often required to be designed in a limited tiny space to meet the requirements of in-band and out-of-band insertion loss suppression, and the design requirements under such tiny volume are difficult to meet by several traditional coaxial and loading deformation resonant units.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a miniaturized filter with an out-of-band rejection zero point, which is conveniently designed in a limited micro space.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a miniaturized wave filter, includes a box and sets up two at least signal ends on the box, vertically be provided with at least two-layer resonance unit that carries out signal transmission with the signal end along it in the box, be provided with the shielding wall between the adjacent two-layer resonance unit, every layer of resonance unit includes the resonance structure of a plurality of vertical being fixed in the box, it is integrated into one piece to have two at least among the resonance structure.

Preferably, the signal terminals are disposed on the same side of the case.

Preferably, the connected resonant structures are connected through a connecting rod, the connecting rod and the resonant structures are integrally formed, two adjacent resonant structures in the connected resonant structures on the same layer are coupled, and the non-connected resonant structures on the same layer are not coupled.

Preferably, the resonance structure includes a resonance long arm and a resonance short arm which are vertically arranged, and a connecting portion for connecting the resonance long arm and the resonance short arm, and the length of the resonance long arm is greater than that of the resonance short arm.

Preferably, a bending portion bent in a direction close to the resonance long arm is formed at a lower end of a part or all of the resonance short arms.

Preferably, the resonant long arm, the resonant short arm and the connecting part are connected to form or approximate to an H-shaped resonant structure.

Preferably, a tuning groove is formed among the top of the long resonant arm, the connecting part and the top of the short resonant arm, a plurality of resonant tuning screws extending into the tuning groove are arranged on the box body, and each tuning groove corresponds to one resonant tuning screw.

Preferably, the shielding wall is vertically arranged in the box body, and the end part of the shielding wall is integrally formed or fixedly attached to the inner wall of the box body.

Preferably, the shielding wall is provided with at least one first opening for coupling between two adjacent layers of resonance units, and the box body is further provided with a coupling adjusting screw extending into the first opening.

Preferably, the shielding wall is provided with at least one second opening, and the box body is further provided with a zero-point coupling adjusting screw extending into the second opening.

Preferably, the box body is provided with a plurality of resonance tuning screws extending into the tuning grooves, and each tuning groove corresponds to one resonance tuning screw.

Preferably, a coupling gap is formed between two adjacent resonant structures on each layer, a plurality of coupling adjusting screws extending into the coupling gap are arranged on the box body, and each coupling gap corresponds to one coupling adjusting screw.

The invention has the beneficial effects that:

1. the resonance unit adopts a multilayer arrangement design, and the transmission zero point design is relatively convenient.

2. The miniaturized H-shaped resonance structure is adopted, so that the coupling type and the coupling polarity of a zero point can be conveniently controlled, the application range is wider, and various customer requirements can be flexibly met in a limited space.

3. The fine tuning screw is additionally arranged at the groove of the H-shaped resonant structure, so that the resonant frequency can be effectively adjusted within a certain range, and the yield is improved.

4. In order to effectively control the installation precision and improve the debugging consistency, the H-shaped resonance units with the coupling relation are stably connected with each other to form a whole body to be processed independently, the precision is controlled, and the product consistency is improved.

Drawings

FIG. 1 is an exploded view of the filter of the present invention;

FIG. 2 is a schematic diagram of the filter front cover plate after being unloaded;

FIG. 3 is a schematic top view of the present invention;

FIG. 4 is a schematic diagram of the structure of the resonant unit of the present invention;

FIG. 5 is a schematic assembled resonator structure according to another embodiment of the present invention;

fig. 6 is a schematic diagram of the exploded structure of fig. 5.

Reference numerals:

100. the resonant cavity comprises a box body, 101, a body, 102, a front cover plate, 103, a rear cover plate, 110, a signal end, 111, a signal input end, 112, a signal output end, 120, a resonant unit, 121, a resonant structure, 123, a resonant long arm, 124, a resonant short arm, 125, a connecting part, 126, a tuning groove, 127, a bending part, 130, a cavity, 140, a connecting rod, 150, a shielding wall, 151, a first opening, 152, a second opening, 160, a resonant adjusting screw, 170, a coupling gap, 180, a coupling adjusting screw, 190 and a zero-point coupling adjusting screw.

Detailed Description

The technical solution of the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention.

Referring to fig. 1 to 3, a miniaturized filter disclosed in an embodiment of the present invention includes a case 100, a signal terminal 110, and at least two layers of resonant units 120, where the case 100 specifically includes a main body 101, a front cover plate 102, and a rear cover plate 103, the main body 101 is preferably in a rectangular parallelepiped structure, both front and rear side surfaces of the main body are open, the other end surfaces are closed, and the front cover plate 102 and the rear cover plate 103 are respectively fixed on the open front and rear side surfaces of the case 100 in a covering manner.

The signal terminals 110 are disposed on the box 100, at least two signal terminals 110 are disposed, and the signal terminals 110 may be distributed on the same side of the body 101, or on different sides, or on the front and rear cover plates 102 and 103 of the box 100, respectively. The signal terminals 110 specifically include a signal input terminal 111 and a signal output terminal 112, for example, in this embodiment, two signal terminals 110 are disposed on the body 101, the two signal terminals 110 are distributed on the same side of the body 100, which are respectively a signal input terminal 111 and a signal output terminal 112, and certainly, more than two signal terminals 110, such as two signal input terminals 111 and a signal output terminal 112, may also be disposed.

A hollow cavity 130 is formed in the body, and the resonant unit 120 is disposed in the cavity 130. Specifically, at least two layers of resonant units 120 are disposed in the body 101, and the multiple layers of resonant units 120 are distributed in the cavity 130 along a longitudinal direction of the cavity 130 (i.e., a front-back direction of the case 100 in fig. 1). The design of the multi-layer resonance unit 120 in the body 101 makes the zero design of the filter relatively convenient. Each layer of the resonant unit 120 is vertically fixed in the body 101, and in this embodiment, the lower end of the resonant unit 120 is fixed on the bottom wall of the cavity 130.

As shown in fig. 4, each layer of resonant unit 120 includes a plurality of resonant structures 121, the plurality of resonant structures 121 are distributed in the cavity 130 along a transverse direction of the cavity (i.e., a left-right direction in fig. 1), each resonant structure 121 is integrally formed and vertically fixed in the cavity 130, and the plurality of resonant structures 121 are located on the same plane. Preferably, two resonant structures 121 or more than three resonant structures 121 in coupling relationship are connected by a connecting rod 140 and integrally formed. In this embodiment 1, because of two signal ends set up on the same side of body 101 that is close to resonance unit 120 both ends, so every layer of resonance unit 120 of corresponding design is a whole, be integrated into one piece, specifically, connect through a connecting rod 140 between two adjacent resonance structures 121, connecting rod 140 and resonance structure 121 integrated into one piece, every layer of resonance unit 120 integrated into one piece's structure, structural stability has been increased and installation accuracy has been improved, and because every layer of resonance unit 120 can wholly process alone, it has improved the product uniformity to control the precision. In other alternative embodiments, as shown in fig. 5 and fig. 6, each layer of resonant units 120 may also be formed by connecting two adjacent resonant structures 121 through a connecting rod 140, and the other resonant structures 121 are not connected; or every two of the three adjacent resonant structures 121 are connected through the connecting rod 140, the other resonant structures 121 are not connected, and so on. Whether the resonant structures 121 are connected or not is mainly designed according to the requirements of product structure and performance. It should be noted that two adjacent resonant structures 121 between the resonant structures 121 connected to the same layer are coupled, and there is no coupling relationship between the resonant structures 121 not connected to the same layer.

A signal input/output portion (not shown) is disposed at one end of each layer of the resonant unit 120, which is close to a side wall (for convenience of description, defined as a left side wall of the body) of the body where the signal terminal 110 is disposed, and the resonant unit 120 realizes signal transmission with the signal terminal 110 through the signal input/output portion.

In this embodiment, each resonant structure 121 specifically includes a long resonant arm 123, a short resonant arm 124, and a connecting portion 125, wherein the long resonant arm 123 and the short resonant arm 124 are both vertically disposed in the body 101, and the length of the long resonant arm 123 is longer than the length of the short resonant arm 124. The connecting portion 125 connects the two resonating arms 123 and 124, and both ends of the connecting portion are integrally formed with the resonating long arm 123 and the resonating short arm 124.

Preferably, a tuning groove 126 is formed between the top of the resonating long arm 123, the connecting portion 125 and the top of the resonating short arm 124 to be depressed downward for adjusting the resonant frequency.

The resonant long arm 123, the resonant short arm 124 and the connecting portion 125 of the present embodiment preferably have or approximate to an H-shaped resonant structure. Due to the electromagnetic particularity of the H-type resonant structures, when two H-type resonant structures are located on the same plane and adjacent to each other (i.e., two adjacent resonant structures 121 of each layer of resonant unit), after one of the two H-type resonant structures is rotated 180 degrees along its own central axis, the coupling polarity is reciprocal inductively and capacitively, and if a coupling form in which the capacitive coupling is used as a main inductive coupling is generated between two adjacent resonant structures 121, the distance between the two resonant structures 121 is not changed, and only one of the two resonant structures 121 is rotated 180 degrees along the central axis, the coupling form between the two resonant structures is changed, so that the original auxiliary inductive coupling is enhanced, and the inductive coupling may be changed into the inductive coupling which is used as a main capacitive coupling and is used as an auxiliary coupling, or the capacitive coupling may still be used as a main inductive coupling but is enhanced. By utilizing the characteristic of the H-shaped resonance structure, the design of the out-of-band suppression zero point in the limited micro space is very convenient, and great advantages are achieved.

In addition, based on design parameter requirements of the filter, the lower end of the short resonating arm 124 of part or all of the resonating structures 121 of each layer of resonating units 120 is designed with a bending part 127 which is bent towards the direction close to the long resonating arm 123 for adjusting the resonating frequency of the resonating structures 121, the longer the bending part 127 extends, the lower the frequency, and the design of the structure of the bending part 127 obviously reduces the size of each resonating structure 121, thereby effectively reducing the weight and the volume of the whole filter. In this embodiment, each layer of resonant unit 120 is composed of four resonant structures 121, where the lower ends of the short resonant arms 124 of three resonant structures 121 are formed with bending portions 127, and one is not designed with a bending portion 127, such as two with bending portions 127, two without or other simple alternatives, etc. may be alternatively designed. The bent portion 127 is not limited to being formed by bending the lower end of the short resonating arm 124 in the direction approaching the long resonating arm 123, and may be integrally formed at another position of the resonating structure 121 as required by actual design, as shown in fig. 6.

A shielding wall 150 is disposed between two adjacent layers of the resonant units 120 to prevent signal crosstalk between the resonant units 120. In this embodiment, the shielding wall 150 is vertically disposed in the body 101, and the end portion of the shielding wall is integrally formed with or fixedly attached to the inner wall of the body 101. Preferably, the shielding wall 150 is provided with at least one first opening 151 for coupling between two adjacent layers of resonant units 120, in this embodiment, one end of the shielding wall 150, which is far away from the left side wall of the body 101 (i.e. close to the right side wall of the body 101), is provided with a first opening 151, and the first opening 151 is communicated with two resonant structures 121 at the rightmost end of two adjacent layers of resonant units 120, so that the two resonant structures 121 are coupled, thereby realizing the coupling between the two layers of resonant units 120. In addition, due to the electromagnetic specificity that the coupling polarity of the H-type resonant structure is inductive and capacitive, when the planes of the two H-type resonant structures are parallel to each other (i.e., two adjacent layers of resonant units 120), holes are formed in different parts of the shielding wall 150 between the two H-type resonant structures, so that capacitive or inductive coupling can be conveniently achieved.

Further, the shielding wall 150 may further include at least one second opening 152 formed therein to facilitate generation of a transmission zero point of the filter, and the second opening 152 may be disposed according to a position of a zero point (i.e., a null value in a frequency response) formed between the two layers of the resonant units 120. The first opening 151 and the second opening 152 are designed according to actual requirements, and of course, the shielding wall 150 may be provided with other openings for coupling adjustment between the resonant units 120 or facilitating generation of transmission zero points, besides the first and second openings 151 and 152, according to requirements.

The body is provided with a plurality of resonance tuning screws 160 extending into the tuning grooves 126, and each tuning groove 126 corresponds to one resonance tuning screw 160, so that the resonance frequency can be effectively adjusted within a certain range, and the yield is improved. A coupling gap 170 is formed between two adjacent resonant structures 121 on each layer, a plurality of coupling tuning screws 180 extending into the coupling gap 170 are arranged on the body 101, and each coupling gap 170 corresponds to one coupling tuning screw 180. In addition, the body 101 is further provided with a coupling adjusting screw 180 extending into the first opening 151 and a zero-point coupling adjusting screw 190 extending into the second opening 152, and the arrangement of the adjusting screws enables the filter to maintain that the filter parameters can be effectively adjusted while the electrical size of each resonant structure 121 is reduced by adopting a special H-shaped resonant structure, so that the weight and the volume of the whole filter are reduced, the yield is higher, and the cost of the filter is reduced.

The resonance unit adopts a multilayer arrangement design, is designed into a miniaturized H-shaped resonance structure by combining with the resonance structure 121, and realizes the convenient design of out-of-band suppression zero point in a limited micro space, thereby flexibly meeting various customer requirements in the limited space and having wider application range.

Therefore, the scope of the present invention should not be limited to the disclosure of the embodiments, but includes various alternatives and modifications without departing from the scope of the present invention, which is defined by the claims of the present patent application.