Filter

Abstract

The utility model provides a filter which comprises a body, the body is provided with a first side and a second side which are opposite to each other, a plurality of resonant cavities are formed in the body, part of the resonant cavities are located on the first side, and the other part of the resonant cavities are located on the second side; the first side or the second side protrudes outwards to form at least one non-resonant zero setting cavity; the body is also provided with a first coupling window and a second coupling window, and two adjacent resonant cavities and two opposite resonant cavities are coupled through the first coupling window; the resonant cavity is coupled with the non-resonant zeroing cavity through the second coupling window. The resonant frequencies of the resonant cavities are different, fine adjustment of the resonant frequency of the filter is achieved through coupling and frequency interaction between the resonant cavities, and specific signal processing requirements are met. Besides, the outside of the first side or the outside of the second side protrudes to form a non-resonant zeroing cavity, and the non-resonant zeroing cavity generates redundant frequency, so that poles are added outside a filter band, the out-of-band rejection is improved, and the use requirement of the filter is met.

Description

Technical Field

[0001] The utility model belongs to the technical field of satellite communications, and in particular relates to a filter. Background Art

[0002] With the development of satellite communications, filters have become an indispensable frequency selection device. Currently, waveguide filters are mostly used at high frequencies (frequencies greater than 8GHz). Most of these waveguide filters use waveguide TE10 mode transmission and use filters of different orders to meet customers' needs for out-of-band suppression. Due to the limited size of the filter, this type of filter is only suitable for low-suppression environments, which limits the use of the filter. Utility Model Content

[0003] The technical purpose of the utility model is to provide a filter, aiming to solve the technical problem that the filter in the related art is only suitable for low-suppression environment.

[0004] In order to solve the above technical problems, the utility model is implemented as follows: a filter comprises: a body, the body having a first side and a second side opposite to each other, a plurality of resonant cavities formed inside the body, part of the resonant cavities being located on the first side, and another part of the resonant cavities being located on the second side; the first side or the second side protrudes outward to form at least one non-resonant zeroing cavity; the body further comprises a first coupling window and a second coupling window, two adjacent resonant cavities and two opposite resonant cavities are coupled through the first coupling window; the resonant cavity is coupled to the non-resonant zeroing cavity through the second coupling window.

[0005] Furthermore, the filter includes two non-resonant zeroing cavities, and the body also has a third coupling window, and the two non-resonant zeroing cavities are coupled through the third coupling window; the two non-resonant zeroing cavities are both located on the first side, or the two non-resonant zeroing cavities are both located on the second side.

[0006] Furthermore, the shape of the non-resonant nulling cavity includes square or cylindrical.

[0007] Further, the non-resonant zeroing cavity is located in the middle of the first side, or the non-resonant zeroing cavity is located in the middle of the second side.

[0008] Further, the first side and the second side are parallel, and the first side and the second side have the same length.

[0009] Furthermore, the length of the first side is 80-100 mm.

[0010] Furthermore, the filter is connected to an external test device via a waveguide port or a wave-to-copper converter.

[0011] Furthermore, six resonant cavities are disposed on the first side; and six resonant cavities are disposed on the second side.

[0012] Compared with the related art, the filter in the utility model has the following beneficial effects:

[0013] In the utility model, a plurality of resonant cavities are formed inside the body, wherein some of the resonant cavities are located on the first side of the body, and another part of the resonant cavities are located on the second side of the body. In the first side, two adjacent resonant cavities are coupled through a first coupling window; in the second side, two adjacent resonant cavities are also coupled through the first coupling window; in the first side and the second side, two opposite resonant cavities are also coupled through the first coupling window. The resonant frequency of each resonant cavity is different. Through coupling, the frequencies between the resonant cavities can interact with each other, thereby forming a new resonant mode, realizing fine adjustment of the resonant frequency of the filter, and at the same time, the transmission bandwidth can be widened or narrowed by adjusting the coupling strength to meet specific signal processing requirements. In addition, in the utility model, a non-resonant zeroing cavity is also protruding from the outside of the first side or the outside of the second side. The non-resonant zeroing cavity and the resonant cavity are coupled through a second coupling window. In actual application, the non-resonant zeroing cavity can generate redundant frequencies, so that the filter adds poles outside the band, thereby improving the out-of-band suppression, which can meet the high suppression environment and meet the use requirements of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic diagram of the structure of the filter in the embodiment of the utility model;

[0016] Figure 2 It is a schematic diagram of the response bandwidth of the filter in the embodiment of the utility model.

[0017] In the drawings, the reference numerals represent: 1. first side; 2. second side; 3. resonant cavity; 4. non-resonant nulling cavity; 5. first coupling window; 6. second coupling window. DETAILED DESCRIPTION

[0018] The embodiments of the utility model are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the utility model, and cannot be understood as limiting the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the utility model.

[0019] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "circumferential", "radial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0020] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0021] See also Figure 1 The utility model provides a filter, including: a body, the body having a first side 1 and a second side 2 opposite to each other, a plurality of resonant cavities 3 formed inside the body, part of the resonant cavities 3 being located on the first side 1, and another part of the resonant cavities 3 being located on the second side 2; at least one non-resonant zeroing cavity 4 is formed by protruding outward on the first side 1 or the second side 2; the body also has a first coupling window 5 and a second coupling window 6, two adjacent resonant cavities 3 and two opposite resonant cavities 3 are coupled through the first coupling window 5; the resonant cavity 3 is coupled to the non-resonant zeroing cavity 4 through the second coupling window 6.

[0022] In the embodiment of the utility model, a plurality of resonant cavities 3 are formed inside the body, wherein some of the resonant cavities 3 are located on the first side 1 of the body, and another part of the resonant cavities 3 are located on the second side 2 of the body. In the first side 1, two adjacent resonant cavities 3 are coupled through the first coupling window 5; in the second side 2, two adjacent resonant cavities 3 are also coupled through the first coupling window 5; in the first side 1 and the second side 2, two opposite resonant cavities 3 are also coupled through the first coupling window 5. The resonant frequency of each resonant cavity 3 is different. Through coupling, the frequencies between the resonant cavities 3 can interact with each other, thereby forming a new resonant mode, realizing fine adjustment of the resonant frequency of the filter, and at the same time, the transmission bandwidth can be widened or narrowed by adjusting the coupling strength to meet specific signal processing requirements. In addition, in the embodiment of the utility model, a non-resonant zeroing cavity 4 is also protrudingly formed outside the first side 1 or the second side 2, and the non-resonant zeroing cavity 4 and the resonant cavity 3 are coupled through the second coupling window 6. In actual application, the non-resonant zeroing cavity 4 can generate redundant frequencies, so that the filter adds poles outside the band, thereby improving the out-of-band suppression, which can meet the high suppression environment and meet the use requirements of the filter.

[0023] Furthermore, the filter includes two non-resonant zeroing cavities 4, and the body also has a third coupling window, and the two non-resonant zeroing cavities 4 are coupled through the third coupling window; the two non-resonant zeroing cavities 4 are both located on the first side 1, or, the two non-resonant zeroing cavities 4 are both located on the second side 2.

[0024] Specifically, in some embodiments, the filter has two non-resonant zeroing cavities 4 protruding from the outside of the first side 1, the two non-resonant zeroing cavities 4 are coupled through a third coupling window, and the two non-resonant zeroing cavities 4 are also coupled to the resonant cavity 3 of the first side 1 through a second coupling window 6. Since two non-resonant zeroing cavities 4 are provided, the frequency generated by the non-resonant zeroing cavities 4 can be changed in actual application, the out-of-band pole of the filter can be changed, the high suppression environment can be met, and the practicality of the filter is improved.

[0025] In some embodiments, the filter has two non-resonant zeroing cavities 4 protruding from the outside of the second side 2, the two non-resonant zeroing cavities 4 are coupled by a third coupling window, and the two non-resonant zeroing cavities 4 are also coupled to the resonant cavity 3 of the second side 2 through a second coupling window 6. Similarly, since two non-resonant zeroing cavities 4 are provided, the frequency generated by the non-resonant zeroing cavities 4 can be changed in actual application, the out-of-band pole of the filter can be changed, the environment of high suppression can be met, and the practicality of the filter can be improved.

[0026] In some embodiments, the filter may include one non-resonant zeroing cavity 4, or three non-resonant zeroing cavities 4, or four non-resonant zeroing cavities 4, etc. By changing the number of non-resonant zeroing cavities 4, the frequency generated by the non-resonant zeroing cavity 4 is changed, thereby changing the out-of-band pole of the filter and improving the practicality of the filter.

[0027] Furthermore, the shape of the non-resonant zeroing cavity 4 includes a square or a cylindrical shape. By changing the shape of the non-resonant zeroing cavity 4, the frequency generated by the non-resonant zeroing cavity 4 can also be changed, thereby changing the out-of-band pole of the filter and improving the practicality of the filter. It can be understood that in some embodiments, the non-resonant zeroing cavity 4 can also be a deformed, irregular structure. The utility model does not limit the specific shape of the non-resonant zeroing filter.

[0028] Further, the non-resonant zeroing cavity 4 is located in the middle of the first side 1 , or the non-resonant zeroing cavity 4 is located in the middle of the second side 2 .

[0029] In some embodiments, the non-resonant zeroing cavity 4 is formed by protruding outward from the middle of the first side 1, so that the non-resonant zeroing cavity 4 is located in the middle of all the resonant cavities 3 on the first side 1. The non-resonant zeroing cavity 4 is arranged in the middle of all the resonant cavities 3 on the first side 1, so the non-resonant zeroing cavity 4 and the resonant cavity 3 located in the middle of the first side 1 are coupled through the second coupling window 6.

[0030] In some embodiments, the non-resonant zeroing cavity 4 is formed by protruding outward from the middle of the second side 2, so that the non-resonant zeroing cavity 4 is located in the middle of all the resonant cavities 3 on the second side 2. The non-resonant zeroing cavity 4 is arranged in the middle of all the resonant cavities 3 on the second side 2, so the non-resonant zeroing cavity 4 and the resonant cavity 3 located in the middle of the second side 2 are coupled through the second coupling window 6.

[0031] In some other embodiments, the non-resonant zeroing cavity 4 can be set at other positions of the main body, such as the left part of the first side 1, the right part of the first side 1, the left part of the second side 2, the right part of the second side 2, etc. By changing the setting position of the non-resonant zeroing cavity 4 in the main body, the non-resonant zeroing cavity 4 can be coupled with different resonant cavities 3, and the resonant frequencies of different resonant cavities 3 are different. Therefore, the non-resonant zeroing cavity 4 can generate different frequencies and different poles to meet the high suppression environment and improve the practicability of the filter.

[0032] Further, the first side 1 is parallel to the second side 2, and the lengths of the first side 1 and the second side 2 are the same. Specifically, the first side 1 and the second side 2 in the body are parallel to each other, and the lengths of the first side 1 and the second side 2 are the same. Therefore, in the body, except for the non-resonant zeroing cavity 4 protruding outward, the first side 1 and the second side 2 can form a rectangular cavity, and the resonant cavity 3 is formed in the rectangular cavity.

[0033] Further, the length of the first side 1 is 80-100 mm. Specifically, the length of the first side 1 can be 80, 82, 85, 88, 90, 92, 95, 98, 100 mm, etc. The length of the first side 1 is equal to the length of the second side 2 and equal to the length of the rectangular cavity, and the filter is mainly formed by the rectangular cavity. Therefore, the length of the rectangular cavity can be the length dimension of the filter, so that the length dimension of the filter can be in the range of 80-100 mm. Compared with the length of the filter of 120 mm in the related art, the embodiment of the utility model can reduce the size of the filter.

[0034] Furthermore, the filter is connected to an external test device through a waveguide port or a wave-to-copper converter. The input and output ports of the test filter are standard interfaces. When testing the filter, the filter can be connected to an external test device through a waveguide port or a wave-to-copper converter for testing.

[0035] Furthermore, in some specific embodiments, six resonant cavities 3 are disposed on the first side 1 , and six resonant cavities 3 are disposed on the second side 2 .

[0036] Specifically, six resonant cavities 3 are sequentially arranged from left to right on the first side 1, and five partition walls are also sequentially arranged. For the four resonant cavities 3 in the middle, each resonant cavity 3 is formed by two partition walls; for the leftmost resonant cavity 3, it is formed by the leftmost partition wall and the free end of the first side 1; for the rightmost resonant cavity 3, it is formed by the rightmost partition wall and the free end of the first side 1. Six resonant cavities 3 are sequentially arranged from left to right on the second side 2, and five partition walls are also sequentially arranged. For the four resonant cavities 3 in the middle, each resonant cavity 3 is formed by two partition walls; for the leftmost resonant cavity 3, it is formed by the leftmost partition wall and the free end of the second side 2; for the rightmost resonant cavity 3, it is formed by the rightmost partition wall and the free end of the second side 2. There is an air channel between the first side 1 and the second side 2 to form a first coupling window 5. In addition, a non-resonant zeroing cavity 4 is formed in the middle of the first side 1 and protrudes outward. There is also an air channel between the non-resonant nulling cavity 4 and the resonant cavity 3 to form a second coupling window 6. With such an arrangement, the embodiment of the utility model can easily achieve 41.5dB suppression of the out-of-band 24000MHz attenuation, wherein the filter response bandwidth is as follows: Figure 2 As shown, compared with the traditional filter, the embodiment of the utility model has an extra-band pole, which improves the out-of-band suppression by 25.5dB. At the same time, the length of the filter is 90mm, and the embodiment of the utility model can also reduce the size by 30mm, so that the comprehensive performance of the filter can be more excellent.

[0037] It can be understood that the embodiment of the utility model does not specifically limit the number of resonant cavities 3 on the first side 1 and the second side 2. For example, the first side 1 can be provided with six resonant cavities 3, and the second side 2 can be provided with seven resonant cavities 3; the first side 1 can be provided with six resonant cavities 3; the second side 2 can be provided with four resonant cavities 3; and so on. The number and setting positions of the resonant cavities 3 can be adjusted according to actual needs, so that the waveguide filter can obtain high out-of-band suppression.

[0038] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0039] The above is a description of the technical solution provided by the utility model. For technicians in this field, according to the ideas of the embodiments of the utility model, there will be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as a limitation on the utility model.

Claims

1. A filter, characterized in that: include: ontology, The body has a first side and a second side opposite to each other, and a plurality of resonant cavities are formed inside the body. Part of the resonant cavity is located on the first side, and another part of the resonant cavity is located on the second side; The first side or the second side protrudes outward to form at least one non-resonant zeroing cavity; The body also has a first coupling window and a second coupling window, and two adjacent resonant cavities and two opposite resonant cavities are coupled through the first coupling window; the resonant cavity is coupled with the non-resonant nulling cavity through the second coupling window.

2. The filter according to claim 1, characterized in that The filter comprises two non-resonant nulling cavities, the body further comprises a third coupling window, and the two non-resonant nulling cavities are coupled through the third coupling window; the two non-resonant nulling cavities are both located on the first side, or the two non-resonant nulling cavities are both located on the second side.

3. The filter according to claim 1, characterized in that The shape of the non-resonant nulling cavity includes a square or a cylinder.

4. The filter according to claim 1, characterized in that The non-resonant nulling cavity is located in the middle of the first side, or the non-resonant nulling cavity is located in the middle of the second side.

5. The filter according to claim 1, characterized in that The first side and the second side are parallel, and the first side and the second side have the same length.

6. The filter according to claim 5, characterized in that The length of the first side is 80-100 mm.

7. The filter according to claim 1, characterized in that The filter is connected to an external test device via a waveguide port or a wave-to-copper converter.

8. The filter according to claim 1, characterized in that The first side is provided with six resonant cavities; the second side is provided with six resonant cavities.

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