Broadband miniaturized cavity filter
Through the arc-shaped parallel equidistant coupling design of the U-shaped coupling plate and the resonator, the problem of size increase in traditional filters under wide bandwidth and high suppression is solved, miniaturization and stability are achieved, and production difficulty and cost are reduced.
Patent Information
- Application Number
- CN202422354470.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-26
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-09-26
AI Technical Summary
Under the requirements of wide bandwidth and high suppression, traditional metal cavity filters have increased in size and high production difficulty, and have difficulty in tolerance control, resulting in low product pass rate and increased cost.
The design of the U-shaped coupling plate and the resonator is equidistantly coupled in arc shape, and the coupling amount is adjusted by adjusting the U-shaped port size or the coupling plate thickness, combined with the insulated support seat and the removable coupling fly rod, miniaturization and stability are achieved.
The filter is miniaturized, the product stability and consistency is improved, the sensitivity is reduced, the production is easy to make, assemble and debug, and the production cost is reduced.
Smart Images
Figure CN223066438U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of filters, in particular to a broadband miniaturized cavity filter. Background Art
[0002] Microwave filters are important components in radio frequency communication systems and are important devices for combining and separating various different frequency signals. After entering the 21st century, microwave filters have gradually become a research hotspot in China. In addition, in recent years, with the rapid development of digital cellular systems and personal communication systems worldwide, the competition is extremely fierce. The utilization of the frequency range is getting larger and larger, the available spectrum resources are becoming increasingly tense, and the interval between frequency bands is getting smaller and smaller. Therefore, the market's requirements for filtering devices are getting higher and higher, not only for low-cost production, but also for low insertion loss, high out-of-band rejection, and high selectivity filter performance. Modern wireless communication systems have put forward increasingly stringent requirements for the size of passive devices. Reducing the size of filters is of great significance for reducing the size of the entire system and even the cost. Traditional metal cavity filters generally increase the number of resonant cavities and introduce single or multiple cross-couplings between two non-adjacent resonant cavities to achieve high rejection indexes. The most commonly used is the flybar. However, using a flybar for cross-coupling also has its limitations: when the product bandwidth requirement is wide and the rejection requirement is high, it will lead to an increase in the number of cavities and an increase in volume; or the flybar disk is very large and very close to the resonance distance, the tolerance is difficult to control, the assembly is troublesome during production, the consistency of the rejection zero point is greatly affected, the product debugging is difficult, resulting in a poor pass rate of the product and an increase in production costs. Summary of the Utility Model
[0003] The purpose of the present utility model is to provide a broadband miniaturized cavity filter to overcome the deficiencies in the prior art.
[0004] To achieve the above purpose, the present utility model provides the following technical solutions:
[0005] The embodiment of this application discloses a broadband miniaturized cavity filter, which is characterized in that: it includes a cavity, a first resonator and a second resonator are arranged in the cavity, an insulating support seat is arranged between the first resonator and the second resonator, a coupling flybar is arranged on the insulating support seat, the coupling flybar includes a first coupling part arranged between the first resonator and the insulating support seat and a second coupling part arranged between the second resonator and the insulating support seat, a first U-shaped coupling piece is arranged at one end of the first coupling part facing the first resonator, and a second U-shaped coupling piece is arranged at one end of the second coupling part facing the second resonator.
[0006] Preferably, in the above broadband miniaturized cavity filter, the first U-shaped coupling piece is arranged to semi-surround the first resonator, and the second U-shaped coupling piece is arranged to semi-surround the second resonator.
[0007] Preferably, in the above-mentioned broadband miniaturized cavity filter, the coupling fly rod is plated with a metallic material.
[0008] Preferably, in the above-mentioned broadband miniaturized cavity filter, the coupling fly rod is detachably arranged on the insulating support seat.
[0009] Compared with the prior art, the advantages of the present utility model are as follows:
[0010] The coupling part of the U-shaped coupling sheet and the resonator is arc-shaped parallel and equally spaced for coupling. On the premise of keeping the coupling distance unchanged, the coupling amount is adjusted by adjusting the size of the U-shaped opening or the thickness of the coupling sheet. The capacitance component has a large dimensional tolerance rate, and the product has high stability and consistency, is easy to manufacture, assemble and debug. Moreover, the arc-shaped parallel coupling area is large, and for the same coupling amount, the dimensional spacing can be widened, reducing sensitivity, and the material tolerance is large. Description of the Drawings
[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.
[0012] Figure 1 Shown is a top view structural schematic diagram of the broadband miniaturized cavity filter in a specific embodiment of the present utility model. Detailed Embodiments
[0013] The following will combine the drawings in the embodiments of the present utility model to describe the technical solutions in the embodiments of the present utility model in detail. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.
[0014] Refer Figure 1As shown in the figure, the broadband miniaturized cavity filter in this embodiment includes a cavity 1. A first resonator 2 and a second resonator 3 are arranged in the cavity 1. An insulating support 4 is arranged between the first resonator 2 and the second resonator 3. A coupling flybar 5 is arranged on the insulating support 4. The coupling flybar 5 includes a first coupling part 501 arranged between the first resonator 2 and the insulating support 4 and a second coupling part 502 arranged between the second resonator 3 and the insulating support 4. A first U-shaped coupling piece 503 is arranged at one end of the first coupling part 501 facing the first resonator 2, and a second U-shaped coupling piece 504 is arranged at one end of the second coupling part 502 facing the second resonator 3.
[0015] Further, the first U-shaped coupling piece 503 is arranged to semi-surround the first resonator 2, and the second U-shaped coupling piece 504 is arranged to semi-surround the second resonator 3.
[0016] Further, the coupling flybar 5 is plated with a metallic material.
[0017] Further, the coupling flybar 5 is detachably arranged on the insulating support 4.
[0018] In this technical solution, the coupling part between the U-shaped coupling piece and the resonator is in arc-shaped parallel equidistant coupling. On the premise of keeping the coupling distance unchanged, the coupling amount is adjusted by adjusting the size of the U-shaped opening or the thickness of the coupling piece. The capacitance component has a large dimensional tolerance rate, and the product has high stability and consistency, is easy to manufacture, assemble and debug. Moreover, the arc-shaped parallel coupling area is large. For the same coupling amount, the dimensional spacing can be widened, the sensitivity is reduced, and the material tolerance is large.
[0019] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.
[0020] The above are only specific embodiments of the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.
Claims
1. A broadband miniaturized cavity filter, characterized in that: It includes a cavity, in which a first resonator and a second resonator are provided. An insulating support seat is arranged between the first resonator and the second resonator. A coupling flybar is provided on the insulating support seat. The coupling flybar includes a first coupling part arranged between the first resonator and the insulating support seat and a second coupling part arranged between the second resonator and the insulating support seat. A first U-shaped coupling piece is provided at one end of the first coupling part facing the first resonator, and a second U-shaped coupling piece is provided at one end of the second coupling part facing the second resonator.
2. The broadband miniaturized cavity filter according to claim 1, characterized in that: The first U-shaped coupling piece is arranged to semi-surround the first resonator, and the second U-shaped coupling piece is arranged to semi-surround the second resonator.
3. The broadband miniaturized cavity filter according to claim 1, wherein: The coupling flybar is plated with a metallic material.
4. A broadband miniaturized cavity filter according to claim 1, characterized in that: The coupling flybar is detachably arranged on the insulating support seat.