阅读说明：本技术 一种小型化高抑制可调腔体滤波器 (Miniaturized high-suppression adjustable cavity filter ) 是由 邓白玉 谢波 于 2020-11-30 设计创作，主要内容包括：本发明公开了一种小型化高抑制可调腔体滤波器,包括第一谐振腔、1/2耦合腔、第二谐振腔、2/3耦合腔、第三谐振腔、3/4耦合腔、第四谐振腔、卡扣和耦合探针；1/2耦合腔在第一谐振腔与第二谐振腔之间,2/3耦合腔在第二谐振腔与第三谐振腔之间,3/4耦合腔在第三谐振腔与第四谐振腔之间；1/2耦合腔、2/3耦合腔、3/4耦合腔设置位置均在腔体滤波器本体的边沿；第一谐振腔与第四谐振腔之间采用耦合探针耦合,且耦合探针与卡扣连接,通过卡扣固定耦合探针等；本发明具有尺寸小,带外抑制强,加工工艺简单,可调试性好,生产方便,可批量化生产等优点。(The invention discloses a miniaturized high-suppression adjustable cavity filter which comprises a first resonant cavity, an 1/2 coupling cavity, a second resonant cavity, a 2/3 coupling cavity, a third resonant cavity, a 3/4 coupling cavity, a fourth resonant cavity, a buckle and a coupling probe, wherein the first resonant cavity is connected with the second resonant cavity through the coupling cavity; 1/2 with a coupling cavity between the first and second resonant cavities, 2/3 with a coupling cavity between the second and third resonant cavities, and 3/4 with a coupling cavity between the third and fourth resonant cavities; the 1/2 coupling cavity, the 2/3 coupling cavity and the 3/4 coupling cavity are arranged at the edge of the cavity filter body; the first resonant cavity is coupled with the fourth resonant cavity through a coupling probe, the coupling probe is connected with a buckle, and the coupling probe and the like are fixed through the buckle; the invention has the advantages of small size, strong out-of-band rejection, simple processing technology, good debugging performance, convenient production, mass production and the like.)

1. A miniaturized high-rejection tunable cavity filter, comprising:

the device comprises a first resonant cavity (11), an 1/2 coupling cavity (2), a second resonant cavity (12), a 2/3 coupling cavity (3), a third resonant cavity (13), a 3/4 coupling cavity (4), a fourth resonant cavity (14), a buckle (5) and a coupling probe (6); 1/2 coupling cavity (2) is between the first resonant cavity (11) and the second resonant cavity (12), 2/3 coupling cavity (3) is between the second resonant cavity (12) and the third resonant cavity (13), 3/4 coupling cavity (4) is between the third resonant cavity (13) and the fourth resonant cavity (14); 1/2 coupling cavity (2), 2/3 coupling cavity (3) and 3/4 coupling cavity (4) are all arranged at the edge of the cavity filter body; the first resonant cavity (11) is coupled with the fourth resonant cavity (14) through a coupling probe (6), the coupling probe (6) is connected with the buckle (5), and the coupling probe (6) is fixed through the buckle (5).

2. The miniaturized high-rejection tunable cavity filter according to claim 1, wherein the coupling probe (6) is cylindrical in shape.

3. The miniaturized high rejection tunable cavity filter according to claim 1 or 2, wherein said clasp (5) is a teflon clasp.

4. The miniaturized high-rejection tunable cavity filter according to claim 1, wherein the clip (5) is an H-clip.

5. The miniaturized, high-rejection, tunable cavity filter of claim 3, wherein the Teflon clip is an H-shaped Teflon clip.

6. The miniaturized high-rejection tunable cavity filter according to claim 1, wherein the coupling probe (6) is an M3 screw.

7. The miniaturized high-rejection tunable cavity filter according to claim 1, comprising a coupling square column (7), a fifth resonant cavity (15), a sixth resonant cavity (16), an 4/5 coupling cavity (8), and a 5/6 coupling cavity (9), wherein the 4/5 coupling cavity (8) is between the fourth resonant cavity (14) and the fifth resonant cavity (15), the 5/6 coupling cavity (9) is between the fifth resonant cavity (15) and the sixth resonant cavity (16), and the coupling square column (7) is disposed between the third resonant cavity (13) and the third resonant cavity (14).

8. The miniaturized high-rejection tunable cavity filter according to claim 7, wherein the clip (5) is an n-type clip.

9. The miniaturized high-rejection tunable cavity filter according to claim 7, wherein the latch (5) is a Teflon latch.

10. The miniaturized high-rejection adjustable cavity filter according to claim 9, wherein the teflon clamp is an n-type teflon clamp.

Technical Field

The invention relates to the field of filters, in particular to a miniaturized high-rejection adjustable cavity filter.

Background

In the current communication technology, microwave radio frequency devices are indispensable important components. The cavity filter is used as a radio frequency device, and the size and out-of-band rejection indexes of the cavity filter have important influence on the performance of the whole machine. The trend towards miniaturization and portability thus requires cavity filters to achieve the required performance specifications in smaller spaces.

At present, the main miniaturization technologies of the cavity filter at home and abroad include a cross coupling technology, a capacitance loading technology, a multi-mode technology, a hybrid electromagnetic coupling technology, a dielectric metal mixing technology and the like, wherein the cross coupling technology and the capacitance loading technology are the most popular miniaturization technologies at present.

With the diversification of the miniaturized cavity filter, the structure and the engineering realization of the filter are from simple to complex, and many new technologies exist where optimization is needed. Because of the limitation of the process, the input and output feed points of the miniaturized filter need to be directly coupled with the adapter, and because of the small size, the tin adding at the connecting part is inconvenient. The conventional M2 screw does not meet the coupling strength requirements.

Therefore, the filter is designed from the engineering practical point of view of adjustability, machinability, etc. in combination with the size and index requirements based on cross-coupling, capacitive loading, etc. non-replaceable technologies.

The prior art still has the following disadvantages:

the traditional design mode designs four-cavity filters: a four-cavity filter can be designed under the same size condition in the traditional mode, but the out-of-band rejection effect of four cavities is weaker, and the out-of-band rejection requirement cannot be met.

The traditional design mode designs six-cavity filters: although the six-cavity filter in the traditional mode has a good out-of-band rejection effect, the size is relatively large, and the size requirement is not met.

The traditional coupling mode at the central position is as follows: the traditional coupling cavity is often located at the center of the two resonant cavities, and is inconvenient to process when the size is too small.

The traditional approach uses coupling screws to tune the coupling cavity: the limited small-size coupling screw is required to be customized by adding the coupling screw, great operation difficulty is brought to debugging, and batch production is inconvenient.

The traditional mode is in order to deepen the coupling screw fully and improve the coupling strength: the coupling strength brought by deepening the coupling screw is limited, and if the coupling screw is too deep, the screw needs to be customized, and the debugging of the screw too deep is more time-consuming.

The conventional approach employs a conventional size coupling probe: the coupling strength of the coupling probe of the traditional M2 is small, in order to meet the coupling strength of cross coupling, the distance between the probe and a resonant cavity loading column is too small, and the risk of short circuit exists, otherwise, the coupling strength is not enough to inhibit the out-of-band inadequacy.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a miniaturized high-suppression adjustable cavity filter which has the advantages of small size, strong out-of-band suppression, simple processing technology, good adjustability, convenience in production, capability of being produced in batch and the like.

The purpose of the invention is realized by the following technical scheme:

a miniaturized high rejection tunable cavity filter, comprising:

the device comprises a first resonant cavity, an 1/2 coupling cavity, a second resonant cavity, a 2/3 coupling cavity, a third resonant cavity, a 3/4 coupling cavity, a fourth resonant cavity, a buckle and a coupling probe; 1/2 with a coupling cavity between the first and second resonant cavities, 2/3 with a coupling cavity between the second and third resonant cavities, and 3/4 with a coupling cavity between the third and fourth resonant cavities; the 1/2 coupling cavity, the 2/3 coupling cavity and the 3/4 coupling cavity are arranged at the edge of the cavity filter body; the first resonant cavity is coupled with the fourth resonant cavity through a coupling probe, the coupling probe is connected with a buckle, and the coupling probe is fixed through the buckle.

Further, the coupling probe is cylindrical in shape.

Further, the buckle is a Teflon buckle.

Further, the buckle is an H-shaped buckle.

Further, the Teflon buckle is an H-shaped Teflon buckle.

Further, the coupling probe employs an M3 screw.

Further, the resonator comprises a coupling square column, a fifth resonant cavity, a sixth resonant cavity, an 4/5 coupling cavity and a 5/6 coupling cavity, wherein the 4/5 coupling cavity is arranged between the fourth resonant cavity and the fifth resonant cavity, the 5/6 coupling cavity is arranged between the fifth resonant cavity and the sixth resonant cavity, and the coupling square column is arranged between the third resonant cavity and the third resonant cavity.

Further, the buckle adopts n type buckle.

Further, the buckle is a Teflon buckle.

Further, the Teflon buckle is an n-type Teflon buckle.

Further, the 1/2, 2/3, 4/5 and 5/6 cavities eliminate the coupling screws above them.

The invention has the beneficial effects that:

the coupling cavity is not placed at the center position according to the traditional mode, but is designed close to the edge, so that a production tool can conveniently contact with the connecting point, the production and the processing are facilitated, and the screw position of the locking cover plate is reserved. The uniform cylindrical probes are adopted for coupling between the resonant cavities, the probes are considered to meet the requirements of safety spacing and coupling strength within a machinable range, mass production of products is guaranteed, the coupling strength requirement is difficult to meet due to limited size, a coupling square column is additionally arranged at the bottom of the cavity to enhance the coupling strength, and the coupling square column is designed to deviate from the center position for guaranteeing the machinability due to small size of the cavity, so that the coupling square column has the advantages of small size, strong out-of-band inhibition, simple machining process, good debugging performance, convenience in production and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a diagram of a resonant cavity magnetic field profile;

FIG. 2 is a schematic diagram of a four-cavity filter according to an embodiment of the present invention;

FIG. 3 is a simulation diagram of a four-cavity filter according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of measured results according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a six-cavity filter according to an embodiment of the present invention;

FIG. 6 is a simulation diagram of a six-cavity filter according to an embodiment of the present invention;

in the figure, 11-a first resonant cavity, 2-1/2 coupled cavity, 12-a second resonant cavity, 3-2/3 coupled cavity, 13-a third resonant cavity, 4-3/4 coupled cavity, 14-a fourth resonant cavity, 5-snap, 6-coupling probe, 7-coupling square column, 15-a fifth resonant cavity, 16-a sixth resonant cavity, 8-4/5 coupled cavity and 9-5/6 coupled cavity.

Detailed Description

The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following. All of the features disclosed in this specification, or all of the steps of a method or process so disclosed, may be combined in any combination, except combinations where mutually exclusive features and/or steps are used.

As shown in fig. 1 to 6, a miniaturized high-rejection adjustable cavity filter includes:

a first resonant cavity 11, an 1/2 coupling cavity 2, a second resonant cavity 12, a 2/3 coupling cavity 3, a third resonant cavity 13, a 3/4 coupling cavity 4, a fourth resonant cavity 14, a buckle 5 and a coupling probe 6; 1/2 with a coupling cavity 2 between the first resonant cavity 11 and the second resonant cavity 12, 2/3 with a coupling cavity 3 between the second resonant cavity 12 and the third resonant cavity 13, and 3/4 with a coupling cavity 4 between the third resonant cavity 13 and the fourth resonant cavity 14; 1/2 coupling cavity 2, 2/3 coupling cavity 3 and 3/4 coupling cavity 4 are arranged at the edge of the cavity filter body; the first resonant cavity 11 and the fourth resonant cavity 14 are coupled by a coupling probe 6, the coupling probe 6 is connected with the buckle 5, and the coupling probe 6 is fixed by the buckle 5.

Further, the coupling probe 6 has a cylindrical shape.

Further, the buckle 5 is a teflon buckle.

Further, the buckle 5 is an H-shaped buckle.

Further, the Teflon buckle is an H-shaped Teflon buckle.

Further, the coupling probe 6 employs an M3 screw.

Further, a coupling square column 7, a fifth resonant cavity 15, a sixth resonant cavity 16, an 4/5 coupling cavity 8 and a 5/6 coupling cavity 9 are included, the 4/5 coupling cavity 8 is between the fourth resonant cavity 14 and the fifth resonant cavity 15, the 5/6 coupling cavity 9 is between the fifth resonant cavity 15 and the sixth resonant cavity 16, and the coupling square column 7 is arranged between the third resonant cavity 13 and the third resonant cavity 14.

Further, the buckle 5 is an n-type buckle.

Further, the buckle 5 is a teflon buckle.

Further, the Teflon buckle is an n-type Teflon buckle.

Further, the 1/2 coupler 2, 2/3 coupler 3, 4/5 coupler 8 and 5/6 coupler 9 eliminate the upper coupling screws.

In the embodiment of the present invention, as shown in fig. 2, which is a schematic structural diagram of a four-cavity filter according to the embodiment of the present invention, the size is 24 × 23.5 × 17mm³Input/output feed point need with adapter direct coupling, because the size is little, the junction adds tin and has more inconveniently, for satisfying the production portability, the coupling chamber between the resonant cavity no longer places according to traditional mode and puts at central point, but leans on the design of limit, makes things convenient for the production instrument contact tie point, is favorable to production and processing. At the same time, this also leaves room for the intermediate cover plate locking screw. In order to guarantee the out-of-band rejection index, the first resonant cavity and the fourth resonant cavity are coupled by adopting uniform cylindrical probes, the probes are M3 screws, the safe distance and the coupling strength requirements are met in a processing range, M3 screws are adopted, the cross-coupled CQ coupling structure forms double-end rejection, and the positions of the probes are fixed by utilizing H-shaped Teflon buckles.

Through design simulation, S parameters are shown in the following figure 3, and both the passband range and the out-of-band rejection condition meet the requirements of design indexes. The method has the advantages that the process is simple, the debugging is convenient, the actually measured S parameter is shown in the following figure 4, the passband range and the out-of-band rejection condition both meet the design index requirements, and the simulation is consistent.

In other embodiments of the present invention, as shown in fig. 5, the cavity filter structure of the present invention is configured such that the input/output feed point of the filter needs to be directly coupled to the adapter, and because of the extremely small size, it is inconvenient to add more tin at the connection point, and in order to meet the requirement of production portability, the 1/2 coupling cavity and the 5/6 coupling cavity are not placed at the center position according to the conventional manner, but are designed along the edge, which facilitates the contact of the production tool with the connection point, and is beneficial to production and processing.

In other embodiments of the present invention, the cavity filter structure of the present invention is shown in fig. 5, because of its extremely small size, the space size above 1/2 coupling cavity 2, 2/3 coupling cavity 3, 4/5 coupling cavity 8 and 5/6 coupling cavity 9 is no longer sufficient to add the tunable coupling screws, so that the coupling screws are removed to satisfy the producibility, and the cost is saved.

The cavity processing has certain tolerance, and the later stage relies on the screw debugging inevitable, for the adjustability that satisfies production, 3/4 coupling screw can not get rid of, and this also means that the distance is relatively far away between third resonant cavity, the fourth resonant cavity, adopts traditional diaphragm coupling mode coupling more weakly can not satisfy the design demand. A coupling square column is added at the bottom of the cavity to enhance the coupling strength, and the coupling square column is designed to be deviated from the central position to ensure the machinability due to the small size of the cavity.

In order to ensure out-of-band inhibition indexes, the second resonant cavity and the fifth resonant cavity are coupled by adopting a uniform cylindrical probe, a cross-coupled CQ coupling structure forms double-end inhibition, and the probe position is fixed by utilizing an n-type Teflon buckle. Through design simulation, S parameters are shown in figure six, and the passband range and the out-of-band rejection condition both meet the design index requirements.

Modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, which should be limited only by the appended claims. In the previous description, numerous specific details were set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known techniques, such as specific construction details, operating conditions, and other technical conditions, have not been described in detail in order to avoid obscuring the present invention.