Zero-cavity filter
By using a four-cavity resonant structure and zero-cavity design, the problem of high insertion loss in existing filters when generating four transmission zeros is solved, achieving high-efficiency filtering effect and low-cost production across the frequency band.
Patent Information
- Application Number
- CN202423082415.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-12
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2034-12-12
AI Technical Summary
Existing filters require six resonant cavities and multiple flybars to generate four transmission zeros, resulting in high insertion loss and a large number of flybars.
A four-resonant cavity structure is adopted. By setting the first and second zero cavities and using the design of the fly rod and spacer ribs, four transmission zeros in the frequency band are realized. The frequency band parameters are adjusted by adjusting the screw, reducing the amount of fly rod used.
It achieves a frequency band with four transmission zeros, low insertion loss, low number of fly rods, simple structure, low cost, and is easy to produce and promote.
Smart Images
Figure CN223665640U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of filter technology, and more specifically to a zero-cavity filter. Background Technology
[0002] A filter is a device that selectively responds to input signals of different frequencies and outputs the desired signal.
[0003] There is a filter, such as Figure 1 As shown, the device includes a housing 90, which has a first resonant cavity 91, a second resonant cavity 92, a third resonant cavity 93, and a fourth resonant cavity 94. The housing 90 also has a partition rib 901, on which a boom rod 95 is mounted. The cavities on both sides of the partition rib 901 are the first resonant cavity 91 and the second resonant cavity 92. It should be noted that by setting the boom rod 95, the frequency band will generate... Figure 2 The two transmission zeros 96 shown are problematic. When four transmission zeros are needed in the frequency band, it is difficult to achieve this with just four resonant cavities. The current approach is to set up six resonant cavities in the filter and use multiple flybars 95 to obtain four transmission zeros. However, six resonant cavities mean that the input signal needs to pass through six cavities before it is output, which results in a large insertion loss. At the same time, arranging multiple flybars 95 also leads to a large number of flybars 95.
[0004] Therefore, there is a need for a zero-cavity filter with only four resonant cavities, four transmission zeros in the frequency band, low insertion loss, and a small number of flybars. Utility Model Content
[0005] The application aims to provide a zero-cavity filter, which comprises a shell and a cover plate, the shell has a concave cavity, the two side walls in the length direction of the concave cavity are respectively provided with two first interval ribs, two second interval ribs and a third interval rib, the two side walls in the width direction of the concave cavity are respectively provided with a first partition rib and a second partition rib, the first partition rib and the second partition rib are spaced apart by a predetermined distance, the third interval rib is connected with the first partition rib or the second partition rib, the first partition rib and the second partition rib are located between the first interval rib and the second interval rib in the width direction of the concave cavity, the first partition rib is provided with a fly bar, the first partition rib and the second partition rib divide the concave cavity into a left chamber and a right chamber, the first interval rib and the second interval rib further divide the left chamber and the right chamber into three chambers, the chambers on the two sides of the first partition rib are a first resonant cavity and a second resonant cavity, the chambers on the two sides of the second partition rib are a first zero cavity and a second zero cavity, the chamber between the two first interval ribs is a third resonant cavity, and the chamber between the two second interval ribs is a fourth resonant cavity, a resonator is arranged in each of the first resonant cavity, the second resonant cavity, the third resonant cavity, the fourth resonant cavity, the first zero cavity and the second zero cavity, the cover plate is located on the side of the shell with the concave cavity, the cover plate is connected with the shell and seals the cavity opening of the concave cavity, by arranging the first zero cavity and the second zero cavity, only four resonant cavities are realized, the frequency band has four transmission zeros, the insertion loss is small, and the amount of fly bar is small.
[0006] Another purpose of the application is to provide a zero-cavity filter, which further comprises five second adjusting screws, each of the five second adjusting screws is arranged on the cover plate in the height direction of the cover plate, and one of the second adjusting screws is arranged between the first partition rib and the second partition rib, and one of the second adjusting screws is arranged on the side of each of the first interval rib and the second interval rib close to the first partition rib or the second partition rib, so as to adjust the return loss and other parameters of the frequency band.
[0007] In order to achieve at least one of the above-mentioned purposes, the application provides a zero-cavity filter, which comprises:
[0008] A housing, the housing has a cavity, the cavity has two side walls in length direction, each of the side walls has two first interval ribs, two second interval ribs and a third interval rib arranged at intervals, the cavity has two side walls in width direction, each of the side walls has a first partition rib and a second partition rib, the first partition rib and the second partition rib are arranged at a predetermined distance, the third interval rib is connected with the first partition rib or the second partition rib, the first partition rib and the second partition rib are arranged between the first interval rib and the second interval rib in the width direction of the cavity, the first partition rib is provided with a flying rod, the first partition rib and the second partition rib divide the cavity into a left chamber and a right chamber, the first interval rib and the second interval rib divide the left chamber and the right chamber into three chambers, the chambers on both sides of the first partition rib are a first resonant cavity and a second resonant cavity, the chambers on both sides of the second partition rib are a first zero cavity and a second zero cavity, the chamber between the first interval rib is a third resonant cavity, the chamber between the second interval rib is a fourth resonant cavity, each of the first resonant cavity, the second resonant cavity, the third resonant cavity, the fourth resonant cavity, the first zero cavity and the second zero cavity is provided with a resonator; and
[0009] A cover plate, the cover plate is arranged on the side of the housing with the cavity, the cover plate is connected with the housing and seals the cavity.
[0010] In one or more embodiments of the present application, the zero cavity filter further comprises two transmission connecting rods, the two transmission connecting rods are arranged in the first resonant cavity and the second resonant cavity respectively.
[0011] In one or more embodiments of the present application, the zero cavity filter further comprises six first adjusting screws, the six first adjusting screws are arranged on the cover plate in the height direction of the cover plate, and the first adjusting screws correspond to the resonators one by one, one end of each first adjusting screw penetrates through the cover plate and extends into the cavity by a predetermined distance, and is located above the corresponding resonator.
[0012] In one or more embodiments of the present application, the zero cavity filter further comprises five second adjusting screws, the five second adjusting screws are arranged on the cover plate in the height direction of the cover plate, one of the second adjusting screws is arranged between the first partition rib and the second partition rib, and one of the second adjusting screws is arranged on one side of each of the first interval rib and the second interval rib close to the first partition rib or the second partition rib.
[0013] In one or more embodiments of the present application, the first partitioning rib has a clamping groove, the zero-cavity filter further comprises a clamping block, the clamping block is clamped into the clamping groove, the clamping block has a through hole, and the fly rod rod passes through the through hole.
[0014] In one or more embodiments of the present application, both sides of the first spacing rib, the second spacing rib and the third spacing rib have transition arc surfaces.
[0015] In the embodiments of the present application, the zero-cavity filter comprises a shell and a cover plate, the shell has a concave cavity, the two side walls in the length direction of the concave cavity are respectively provided with two spaced first spacing ribs, two spaced second spacing ribs and a third spacing rib, the two side walls in the width direction of the concave cavity are respectively provided with a first partitioning rib and a second partitioning rib, the first partitioning rib and the second partitioning rib are spaced apart by a predetermined distance, the third spacing rib is connected with the first partitioning rib or the second partitioning rib, the first partitioning rib and the second partitioning rib are located between the first spacing rib and the second spacing rib in the width direction of the concave cavity, the first partitioning rib is provided with a fly rod rod, and the first partitioning rib and the second partitioning rib divide the concave cavity into a left chamber and a right chamber, respectively, and the first spacing rib and the second spacing rib further divide the left chamber and the right chamber into three chambers, respectively, the chambers on both sides of the first partitioning rib are a first resonant cavity and a second resonant cavity, respectively, the chambers on both sides of the second partitioning rib are a first zero-cavity and a second zero-cavity, respectively, the chamber between the two first spacing ribs is a third resonant cavity, and the chamber between the two second spacing ribs is a fourth resonant cavity, a resonator is arranged in each of the first resonant cavity, the second resonant cavity, the third resonant cavity, the fourth resonant cavity, the first zero-cavity and the second zero-cavity, the cover plate is located on the side of the shell having the concave cavity, the cover plate is connected with the shell and seals the cavity opening of the concave cavity, by arranging the first zero-cavity and the second zero-cavity, only four resonant cavities are realized, the frequency band has four transmission zeros, the insertion loss is small, and the amount of fly rod rod used is small. BRIEF DESCRIPTION OF DRAWINGS
[0016] These and / or other aspects and advantages of the present application will become more apparent and more readily appreciated from the following detailed description of the embodiments of the present application, taken in conjunction with the accompanying drawings in which:
[0017] Figure 1 Fig. 1 shows a structural schematic diagram of a filter according to the prior art;
[0018] Figure 2 Fig. 2 shows a frequency band schematic diagram of a filter according to the prior art having double transmission zeros;
[0019] Figure 3 Fig. 3 shows a structural schematic diagram of a zero-cavity filter according to the present application;
[0020] Figure 4 Fig. 4 shows a structural schematic diagram of the shell;
[0021] Figure 5A structural schematic diagram at the cover plate is shown;
[0022] Figure 6 A frequency band schematic diagram of a zero-cavity filter with four transmission zero points according to the present application is shown. DETAILED DESCRIPTION
[0023] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but are merely used to enable a clear and complete understanding of the application. Accordingly, it should be apparent to those skilled in the art that the following description of various embodiments of the present application is provided for illustration purpose only and not for the purpose of limiting the application as defined by the appended claims and their equivalents.
[0024] It is understood that the term "one" should be construed to "at least one" or "one or more," that is, in one embodiment, the number of a component can be one, and in another embodiment, the number of the component can be more than one, and the term "one" should not be construed as limiting the number.
[0025] Although ordinal numbers such as "first," "second," etc., will be used to describe various components, the components are not limited by the ordinal numbers. The ordinal numbers are used merely to distinguish one component from another. For example, a first component can be referred to as a second component, and similarly, a second component can also be referred to as a first component without departing from the teachings of the present inventive concept. The term "and / or" used herein includes any and all combinations of one or more associated listed items.
[0026] The terms used herein are merely used to describe various embodiments and are not intended to limit the application. As used herein, the singular form is 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 "has," when used in this specification, specify the presence of stated features, numbers, steps, operations, components, elements, or a combination thereof, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, elements, or groups thereof.
[0027] A schematic zero-cavity filter, referring to Figures 3 to 6 A zero-cavity filter according to a preferred embodiment of the present application includes a housing 10 and a cover plate 20.
[0028] Specifically, as Figure 4As shown, the shell 10 has a concave cavity 101, the two side walls of the concave cavity 101 in the length direction are respectively provided with two spaced first spacing ribs 1011, two spaced second spacing ribs 1012 and a third spacing rib 1013, the two side walls of the concave cavity 101 in the width direction are respectively provided with a first partition rib 1014 and a second partition rib 1015, the first partition rib 1014 and the second partition rib 1015 are spaced apart by a predetermined distance, the first partition rib 1014 and the second partition rib 1015 are both located between the first spacing rib 1011 and the second spacing rib 1012 in the width direction of the concave cavity 101, the third spacing rib 1013 is connected with the first partition rib 1014 or the second partition rib 1015, in the embodiment of the application, the third spacing rib 1013 is connected with the second partition rib 1015, and the connection mode is preferably injection molding; the first partition rib 1014 and the second partition rib 1015 divide the concave cavity 101 into left and right chambers, and the first spacing rib 1011 and the second spacing rib 1012 further divide the left and right chambers into three chambers, the chambers on both sides of the first partition rib 1014 are a first resonant cavity 1021 and a second resonant cavity 1022, the chambers on both sides of the second partition rib 1015 are a first zero cavity 1025 and a second zero cavity 1026, the chamber between the two first spacing ribs 1011 is a third resonant cavity 1023, and the chamber between the two second spacing ribs 1012 is a fourth resonant cavity 1024, the first resonant cavity 1021, the second resonant cavity 1022, the third resonant cavity 1023, the fourth resonant cavity 1024, the first zero cavity 1025 and the second zero cavity 1026 are all provided with a resonator 40.
[0029] In addition, as shown in the drawings, Figures 2 to 4 As shown, the cover plate 20 is located on the side of the shell 10 having the concave cavity 101, the cover plate 20 is connected with the shell 10 and closes the cavity opening of the concave cavity 101, specifically, the side of the shell 10 having the concave cavity 101 has several threaded holes on four sides, the cover plate 20 is threadedly connected with the corresponding threaded holes on the shell 10 through threaded fasteners 201, so as to realize detachable connection of the cover plate 20 and the shell 10.
[0030] It should be noted that, due to the flow between the third resonant cavity 1023 and the fourth resonant cavity 1024, and the first zero cavity 1025 and the second zero cavity 1026 are completely blocked by the second partitioning rib 1015, the first resonant cavity 1021 and the second resonant cavity 1022 are completely blocked by the first partitioning rib 1014, the input signal can only flow from the first resonant cavity 1021 to the third resonant cavity 1023 to the fourth resonant cavity 1024, and output from the second resonant cavity 1022; It should be noted that, by providing the flying rod 30 on the first partitioning rib 1014, two transmission zeros are generated in the frequency band, and it should be noted that the flying rod 30 is equivalent to a flat plate capacitor, and the flying rod can be used to filter out unwanted signals outside the passband, by adjusting the length of the flying rod 30 or the area size of the two ends of the flying rod 30, the position of the transmission zero corresponding to the frequency relative to the passband can be adjusted; In addition, by providing the first zero cavity 1025 and the second zero cavity 1026, the frequency band generates a frequency band as shown in Figure 6 The first zero cavity 1025 and the second zero cavity 1026 have two transmission zeros 70, and because the resonant frequency of the first zero cavity 1025 and the second zero cavity 1026 is outside the passband when the filter is working, the first zero cavity 1025 and the second zero cavity 1026 will not affect the insertion loss of the passband, but will only generate two transmission zeros outside the passband, and improve the out-of-band rejection performance of the filter. It can be seen that, compared with the prior art which needs to set six resonant cavities, the input signal needs to pass through six cavities to output, and a plurality of flying rods 30 are provided to obtain a plurality of transmission zeros, the present application has the advantages of only four resonant cavities, and the frequency band has four transmission zeros, the insertion loss is small, and the amount of flying rod is less.
[0031] Further, for the convenience of signal input and output, as shown in Figure 4 The zero cavity filter further comprises two transmission connecting rods 50, and the two transmission connecting rods 50 are respectively arranged in the first resonant cavity 1021 and the second resonant cavity 1022.
[0032] Further, for adjusting the resonator 40, as shown in Figure 3As shown, the zero-cavity filter further includes six first adjusting screws 601. All six first adjusting screws 601 are movable on the cover plate 20 in the height direction, and each first adjusting screw 601 corresponds one-to-one with a resonator 40. One end of each first adjusting screw 601 passes through the cover plate 20 and extends a predetermined distance into the cavity 101, positioned above the corresponding resonator 40. Specifically, six first nuts 602 are fixedly connected to the cover plate 20, and the fixing method includes, but is not limited to, welding. The cover plate 20 also has an insertion hole (not shown in the figure). Each first adjusting screw 601 is threadedly connected to the corresponding first nut 602 and passes through the insertion hole. When the first adjusting screw 601 is rotated, the first adjusting screw 601 further extends into the cavity 101 or gradually disengages from the cavity 101.
[0033] Similarly, to fine-tune the return loss, insertion loss, etc., at the resonant frequency, such as... Figure 5 As shown, the zero-cavity filter further includes five second adjusting screws 603. All five second adjusting screws 603 are movable on the cover plate 20 in the height direction. Their height adjustment method is the same as that of the first adjusting screw 601. A second adjusting screw 603 is provided between the first partition rib 1014 and the second partition rib 1015. A second adjusting screw 603 is provided on the side of each first partition rib 1011 and the second partition rib 1012 near the first partition rib 1014 or the second partition rib 1015.
[0034] Furthermore, to enable the flying rod 30 to be installed on the first partition rib 1014, as follows: Figure 4 As shown, the first partition rib 1014 has a slot 10141, and the zero cavity filter also includes a block 10142. The block 10142 is inserted into the slot 10141. The block 10142 has a through hole (not shown in the figure), and the flying rod 30 passes through the through hole.
[0035] Furthermore, to facilitate processing and shaping, such as Figure 4 As shown, the first spacer 1011, the second spacer 1012 and the third spacer 1013 all have transition arc surfaces 10111 on both sides.
[0036] In summary, the zero-cavity filter described in the embodiments of this application is explained, which provides the zero-cavity filter with only four resonant cavities and four transmission zeros in the frequency band, and has advantages such as low insertion loss and less flying rod usage.
[0037] It is worth mentioning that, in the embodiment of the present application, the zero-cavity filter has simple structure, does not involve complex manufacturing process and expensive materials, and has high economy. Meanwhile, for the manufacturer, the zero-cavity filter provided by the present application is easy to produce and has low cost, which is more conducive to controlling the production cost, and is further conducive to product promotion and use.
[0038] It should be understood by those skilled in the art that the above description and the embodiments of the present application shown in the drawings are only examples and do not limit the present application. The purpose of the present application has been fully and effectively achieved. The function and structural principle of the present application have been shown and described in the embodiments, and the implementation of the present application can be any deformation or modification without departing from the principle.
Claims
1. A zero-cavity filter characterized by: The zero-cavity filter comprises a housing, the housing has a concave cavity, two side walls of the concave cavity in the length direction are respectively provided with two spaced first spacing ribs, two spaced second spacing ribs and a third spacing rib, two side walls of the concave cavity in the width direction are respectively provided with a first partition rib and a second partition rib, the first partition rib and the second partition rib are spaced apart by a predetermined distance, the third spacing rib is connected with the first partition rib or the second partition rib, the first partition rib and the second partition rib are located between the first spacing rib and the second spacing rib in the width direction of the concave cavity, the first partition rib is provided with a fly rod, the first partition rib and the second partition rib divide the concave cavity into left and right chambers, the first spacing rib and the second spacing rib further divide the left and right chambers into three chambers, the chambers on both sides of the first partition rib are a first resonant cavity and a second resonant cavity, the chambers on both sides of the second partition rib are a first zero cavity and a second zero cavity, the chamber between the two first spacing ribs is a third resonant cavity, and the chamber between the two second spacing ribs is a fourth resonant cavity; and a cover plate, the cover plate is located on the side of the housing with the concave cavity, the cover plate is connected with the housing and closes the cavity opening of the concave cavity.
2. The all-cavity filter of claim 1, wherein: The zero-cavity filter further comprises two transmission connecting rods, the two transmission connecting rods are respectively arranged in the first resonant cavity and the second resonant cavity.
3. The all-cavity filter of claim 2, wherein: The zero-cavity filter further comprises six first adjusting screws, the six first adjusting screws are movably arranged on the cover plate in the height direction of the cover plate, and the first adjusting screws correspond to the resonators one by one, one end of each first adjusting screw penetrates through the cover plate and extends into the concave cavity by a predetermined distance, and is located above the corresponding resonator.
4. The all-cavity filter of claim 3, wherein: The zero-cavity filter further comprises five second adjusting screws, the five second adjusting screws are movably arranged on the cover plate in the height direction of the cover plate, one of the second adjusting screws is arranged between the first partition rib and the second partition rib, and one of the second adjusting screws is arranged on one side of each of the first spacing rib and the second spacing rib close to the first partition rib or the second partition rib.
5. The all-cavity filter of claim 4, wherein: The first partition rib has a clamping groove, the zero-cavity filter further comprises a clamping block, the clamping block is clamped into the clamping groove, the clamping block has a through hole, and the fly rod rod penetrates through the through hole.
6. The all-pass filter according to any one of claims 1 to 5, characterized in that: Both sides of the first spacing rib, the second spacing rib and the third spacing rib have a transition arc surface.