CN220474868U

CN220474868U - Coaxial airtight cavity filter

Info

Publication number: CN220474868U
Application number: CN202322041794.3U
Authority: CN
Inventors: 曾华; 李�杰; 张光伟
Original assignee: Dbwave Technologies Co ltd
Current assignee: Dbwave Technologies Co ltd
Priority date: 2023-08-01
Filing date: 2023-08-01
Publication date: 2024-02-09
Anticipated expiration: 2033-08-01

Abstract

The utility model discloses a coaxial airtight cavity filter, which comprises a rectangular hollow shell, a core arranged in the shell, a coaxial connector arranged at the end part of the core, and an end cover plate which covers the coaxial connector and is welded with the end part of the shell; the coaxial connector penetrates through the end cover plate and is connected with the end cover plate in a sealing manner; the core comprises a hollow core cavity, a rectangular resonant cavity which is arranged in the core cavity in a sectioning way, an upper cover plate and a lower cover plate which are covered on the core cavity, and a plurality of resonant rods which are arranged in the resonant cavity; a first side wall and a second side wall are oppositely arranged in the core cavity; the resonant rods are connected with the first side wall and the second side wall in an alternating manner. Through the scheme, the utility model has the advantages of simple structure, easiness in processing, reliable sealing and the like, and has high practical value and popularization value in the technical field of cavity filters.

Description

Coaxial airtight cavity filter

Technical Field

The utility model relates to the technical field of cavity filters, in particular to a coaxial airtight cavity filter.

Background

A filter is a frequency selective device that passes certain frequency components of a signal while greatly attenuating other frequency components. With this frequency-selective action of the filter, interference noise can be filtered out or spectral analysis can be performed. The frequency bands of the passed signals are divided into five types of low-pass, high-pass, band-stop and all-pass filters. In addition, the transmission line classification by the filter may be classified into a microstrip filter, an interdigital filter, a coaxial filter, a waveguide filter, a comb-line cavity filter, a spiral cavity filter, a small lumped parameter filter, a ceramic dielectric filter, a sir (step impedance resonator) filter, a high temperature superconducting material, and the like.

A resonant cavity is arranged in a shell of the coaxial filter, and the resonant cavity of the coaxial filter in the prior art is irregular, so that the processing of the resonant cavity is complex. In addition, conventional coaxial filters are in the form of either laser covers or parallel seam welded covers. When the cover plate package with large area is encountered, the welding seam is long, the consistency of laser seal welding is poor, the operation is complex, and the airtight success rate is greatly reduced.

Therefore, it is highly desirable to provide a coaxial airtight cavity filter with simple structure, easy processing and reliable sealing.

Disclosure of Invention

The utility model aims to provide a coaxial airtight cavity filter aiming at the problems, and the technical scheme adopted by the utility model is as follows:

the coaxial airtight cavity filter comprises a rectangular hollow shell, a core arranged in the shell, a coaxial connector arranged at the end part of the core, and an end cover plate which covers the coaxial connector and is welded with the end part of the shell; the coaxial connector penetrates through the end cover plate and is connected with the end cover plate in a sealing manner;

the core comprises a hollow core cavity, a rectangular resonant cavity which is arranged in the core cavity in a sectioning way, an upper cover plate and a lower cover plate which are covered on the core cavity, and a plurality of resonant rods which are arranged in the resonant cavity; a first side wall and a second side wall are oppositely arranged in the core cavity; the resonant rods are connected with the first side wall and the second side wall in an alternating manner.

Further, four corners of the inner side wall of the shell are respectively provided with a fixed connecting rib; the fixed connecting ribs are distributed along the length direction of the shell; a fixing plate is arranged between the end part of the core and the end part of the shell.

Further, a plurality of upper cover plate tuning screws are arranged on the upper cover plate.

Further, the outer side wall of the core cavity is provided with a plurality of side tuning screws corresponding to the positions of the resonant rods one by one.

Further, the resonant rod comprises an end resonant rod; the end resonant rod is arranged at the end part of the resonant cavity; the end resonant rod is L-shaped.

Further, a plurality of first screws are arranged between the fixing plate and the core and between the fixing plate and the fixing connecting ribs.

Further, a plurality of second screws are arranged between the core cavity and the upper cover plate and between the core cavity and the lower cover plate.

Compared with the prior art, the utility model has the following beneficial effects:

(1) The utility model skillfully arranges the rectangular resonant cavity, and the resonant rods in the resonant cavity are connected with the first side wall and the second side wall in an alternating mode, so that the utility model has simple structure and is convenient for processing.

(2) According to the utility model, the shell, the fixed connecting ribs and the fixed plate are arranged, and the core is wrapped, so that the sealing reliability of the core is ensured.

In conclusion, the utility model has the advantages of simple structure, easy processing, reliable sealing and the like, and has high practical value and popularization value in the technical field of cavity filters.

Drawings

For a clearer description of the technical solutions of the embodiments of the present utility model, the drawings to be used in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and should not be considered as limiting the scope of protection, and other related drawings may be obtained according to these drawings without the need of inventive effort for a person skilled in the art.

Fig. 1 is a schematic view of the structure of the present utility model (with the fixing plate removed).

Fig. 2 is a schematic diagram of the blasting of the present utility model.

Fig. 3 is a schematic view of a blasting of the core of the present utility model.

FIG. 4 is a top view of the core cavity and resonator rod of the present utility model.

Fig. 5 is an insertion loss test chart of the present utility model.

Fig. 6 is an out-of-band rejection test chart of the present utility model.

FIG. 7 is a chart of standing wave ratio test of the present utility model.

In the above figures, the reference numerals correspond to the component names as follows:

1. a housing; 2. a core; 3. a first screw; 4. a fixing plate; 5. an end cover plate; 6. fixing the connecting ribs; 21. a core cavity; 22. an upper cover plate; 23. a lower cover plate; 24. a coaxial connector; 25. a second screw; 26. an upper cover plate tuning screw; 27. a side tuning screw; 28. a resonant cavity; 29. a resonant rod; 291. an end resonant rod; 211. a first sidewall; 212. a second sidewall.

Detailed Description

For the purposes, technical solutions and advantages of the present application, the present utility model will be further described with reference to the accompanying drawings and examples, and embodiments of the present utility model include, but are not limited to, the following examples. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.

Examples

In this embodiment, the term "and/or" is merely an association relationship describing the association object, and indicates that three relationships may exist, for example, a and/or B may indicate: a exists alone, A and B exist together, and B exists alone.

The terms first and second and the like in the description and in the claims of the present embodiment are used for distinguishing between different objects and not for describing a particular sequential order of objects. For example, the first target object and the second target object, etc., are used to distinguish between different target objects, and are not used to describe a particular order of target objects.

In the embodiments of the present application, words such as "exemplary" or "such as" are used to mean serving as examples, illustrations, or descriptions. Any embodiment or design described herein as "exemplary" or "for example" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

In the description of the embodiments of the present application, unless otherwise indicated, the meaning of "a plurality" means two or more. For example, the plurality of processing units refers to two or more processing units; the plurality of systems means two or more systems.

As shown in fig. 1 to 4, the present embodiment provides a coaxial airtight cavity filter comprising a rectangular and hollow housing 1, a core 2 provided in the housing 1, a coaxial connector 24 provided at an end of the core 2, an end cover plate 5 covering the coaxial connector 24 and welded to the end of the housing 1, fixing connection ribs 6 provided at four corners of an inner side wall of the housing 1, respectively, and a fixing plate 4 provided between the end of the core 2 and the end of the housing 1 and fixing the core 2. Wherein the fixed connection bars 6 are arranged along the length direction of the housing 1. The coaxial connector 24 is provided through the end cover 5, and is connected to the end cover 5 in a sealing manner. In the present embodiment, the core 2 serves as a sealing structure of an inner layer, and the housing 1 and the fixing plate 4 serve as sealing structures of an outer layer. In the shell 1, two hollow spaces are formed between the core 2 and the fixed connecting ribs 6. In this embodiment, the fixing plate 4 is connected to the core 2 and the fixing plate 4 is connected to the fixing rib 6 by the first screw 3.

In this embodiment, the core 2 includes a hollow core cavity 21, a rectangular resonant cavity 28 cut into the core cavity 21, an upper cover plate 22 and a lower cover plate 23 covering the core cavity 21, a plurality of resonant rods 29 disposed in the resonant cavity 28, a plurality of upper cover plate tuning screws 26 disposed on the upper cover plate 22, and a plurality of side tuning screws 27 disposed on the outer side wall of the core cavity 21 in one-to-one correspondence with the positions of the resonant rods 29. A plurality of second screws 25 are arranged between the core cavity 21 and the upper cover plate 22 and between the core cavity 21 and the lower cover plate 23.

In the present embodiment, the inner side wall of the core cavity 21 may be divided into a first side wall 211 and a second side wall 212 which are disposed opposite to each other, and the resonant rod 29 is connected with the first side wall 211 and the second side wall 212 in an alternating manner. Here, an end resonant rod 291 is provided at an end of the resonant cavity 28, and the end resonant rod 291 has an L shape.

From fig. 5 to fig. 7, it can be seen that the working frequency of the coaxial airtight cavity filter in this embodiment is 2.2-2.7GHz, the actual loss is 0.86dB at maximum, the out-of-band rejection is 52dB at minimum, the standing wave ratio is not more than 1.4, and the electrical performance index of the coaxial airtight cavity filter completely meets the requirements, and the coaxial airtight cavity filter has excellent performance.

The above embodiments are only preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, but all changes made by adopting the design principle of the present utility model and performing non-creative work on the basis thereof shall fall within the scope of the present utility model.

Claims

1. The coaxial airtight cavity filter is characterized by comprising a rectangular hollow shell (1), a core (2) arranged in the shell (1), a coaxial connector (24) arranged at the end part of the core (2), and an end cover plate (5) which covers the coaxial connector (24) and is welded with the end part of the shell (1); the coaxial connector (24) penetrates through the end cover plate (5) and is connected with the end cover plate (5) in a sealing mode;

the core (2) comprises a hollow core cavity (21), a rectangular resonant cavity (28) which is cut in the core cavity (21), an upper cover plate (22) and a lower cover plate (23) which are covered on the core cavity (21), and a plurality of resonant rods (29) which are arranged in the resonant cavity (28); a first side wall (211) and a second side wall (212) are relatively arranged in the core cavity (21); the resonant rods (29) are connected to the first side wall (211) and the second side wall (212) in an alternating manner.

2. The coaxial airtight cavity filter according to claim 1, wherein four corners of the inner side wall of the housing (1) are respectively provided with a fixed connection rib (6); the fixed connecting ribs (6) are distributed along the length direction of the shell (1); a fixing plate (4) is arranged between the end part of the core (2) and the end part of the shell (1).

3. A coaxial hermetic cavity filter as claimed in claim 1, wherein the upper cover plate (22) is provided with a plurality of upper cover plate tuning screws (26).

4. A coaxial hermetic cavity filter as claimed in claim 1, wherein the outer lateral wall of the core cavity (21) is provided with a plurality of side tuning screws (27) in one-to-one correspondence with the positions of the resonant rods (29).

5. A coaxial hermetic cavity filter as in claim 1 or 2 or 3 or 4, wherein the resonating rod (29) comprises an end resonating rod (291); the end resonant rod (291) is arranged at the end of the resonant cavity (28); the end resonant rod (291) has an L shape.

6. A coaxial hermetic cavity filter as claimed in claim 2, wherein a plurality of first screws (3) are provided between the fixing plate (4) and the core (2) and between the fixing plate (4) and the fixing connection rib (6).

7. A coaxial hermetic cavity filter according to claim 1, wherein a plurality of second screws (25) are arranged between the core cavity (21) and the upper cover plate (22) and between the core cavity (21) and the lower cover plate (23).