Filter

Abstract

The utility model provides a filter comprising a body which is provided with a plurality of resonant cavity bodies arranged at intervals along the length direction. A first coupling window is arranged between two adjacent resonant cavity bodies; the filter further comprises at least one pole cavity body protruding outwards from the body, one pole cavity body is arranged on any side of any resonant cavity body in the width direction and aligned with the corresponding resonant cavity body, and the pole cavity body is coupled with the corresponding resonant cavity body through a second coupling window. The filter body protrudes outwards to form the pole cavity body, the pole cavity body and the resonant cavity body are coupled through the second coupling window, and the pole cavity body can generate redundant frequency, so that poles are added outside a filter band, the out-of-band rejection is improved, and a high-rejection environment is met. In addition, the filter can obtain excellent insertion loss and out-of-band rejection performance by adjusting the arrangement positions and the number of the pole cavity bodies, and the comprehensive performance of the filter is improved.

Description

Technical Field

[0001] This utility model belongs to the field of mobile communications, and in particular relates to a filter. Background Technology

[0002] With the development of mobile communications, filters have become indispensable frequency selection devices. Sometimes, filters are required to have low insertion loss but high suppression. Therefore, most filters incorporate "cross-coupling" to meet this requirement, but this places high demands on the filter's design and makes the overall design difficult. Utility Model Content

[0003] The technical objective of this utility model is to provide a filter that addresses the technical problems of high design requirements and overall design difficulty in related technologies.

[0004] To solve the above-mentioned technical problems, this utility model is implemented as follows: a filter includes a body, the body being provided with a plurality of resonant cavities spaced apart along the length direction; a first coupling window is provided between two adjacent resonant cavities; the filter further includes at least one pole cavity protruding outward from the body, one pole cavity being disposed on any side of any of the resonant cavities along the width direction and aligned with the corresponding resonant cavity, the pole cavity being coupled to the corresponding resonant cavity through a second coupling window.

[0005] Furthermore, in some embodiments, the body has a first enclosing wall and a first base plate, the first enclosing wall is arranged circumferentially, and the first enclosing wall and the first base plate form a first enclosing space; a plurality of resonant cavity bodies are spaced apart within the first enclosing space; the first coupling window is formed in the first enclosing space, and the pole cavity body protrudes outside the first enclosing wall.

[0006] Furthermore, in some embodiments, a plurality of second enclosing walls protrude outward from the first enclosing wall, and a plurality of second bottom plates protrude outward from the first bottom plate. The second enclosing walls and the second bottom plates correspond one-to-one, and the second enclosing walls and the second bottom plates form a second enclosing space. The first enclosing space and the second enclosing space are connected. The pole cavity is provided in the second enclosing space, and the pole cavity corresponds one-to-one with the second enclosing space.

[0007] Furthermore, in some embodiments, the first enclosing wall includes a first sidewall and a second sidewall disposed along the width direction, the first sidewall having a plurality of second enclosing walls protruding outward, and / or the second sidewall having a plurality of second enclosing walls protruding outward.

[0008] Furthermore, in some embodiments, the pole cavity includes a circular cavity, a square cavity, or an irregularly shaped cavity.

[0009] Furthermore, in some embodiments, the body includes a first resonant cavity, a second resonant cavity, a third resonant cavity, a fourth resonant cavity, a fifth resonant cavity, and a sixth resonant cavity arranged sequentially along the length direction. The body has a first pole cavity and a second pole cavity protruding outward from one side along the width direction. The first pole cavity and the second resonant cavity are aligned along the width direction, and the second pole cavity and the fifth resonant cavity are aligned along the width direction.

[0010] Furthermore, in some embodiments, the body has a third pole cavity protruding outward along the other side of the width direction, wherein the third pole cavity and the fourth resonant cavity are aligned along the width direction.

[0011] Furthermore, in some embodiments, the body has a third pole cavity and a fourth pole cavity protruding outward along the other side of the width direction, wherein the third pole cavity and the third resonant cavity are aligned along the width direction, and the fourth pole cavity and the fifth resonant cavity are aligned along the width direction.

[0012] Furthermore, in some embodiments, the body has a third pole cavity, a fourth pole cavity, and a fifth pole cavity protruding outward along the other side of the width direction, wherein the third pole cavity and the second resonant cavity are aligned along the width direction, the fourth pole cavity and the third resonant cavity are aligned along the width direction, and the fifth pole cavity and the fourth resonant cavity are aligned along the width direction.

[0013] Furthermore, in some embodiments, ports are provided at both ends of the body along its length.

[0014] The filter in this invention has the following advantages compared to related technologies:

[0015] In this invention, each resonant cavity has a different resonant frequency. Through coupling via a first coupling window, the frequencies of the resonant cavities can interact, forming new resonant modes and enabling fine-tuning of the filter's resonant frequency. Furthermore, the transmission bandwidth can be widened or narrowed by adjusting the coupling strength to meet specific signal processing requirements. By forming pole cavities protruding outwards from the filter body, and coupling the pole cavities and resonant cavities through a second coupling window, the pole cavities can generate redundant frequencies in practical applications, adding poles to the filter's out-of-band signal and improving out-of-band rejection. This satisfies the requirements of high-suppression environments and meets the filter's usage needs. Since the pole cavities are not part of the filter's own resonant cavity, they do not affect the filter's Q value, thus significantly improving the filter's insertion loss and out-of-band performance. Moreover, the number of pole cavities and their placement next to the resonant cavities are not limited. Therefore, by adjusting the placement and number of pole cavities, the filter can achieve excellent insertion loss and out-of-band rejection performance, improving the overall performance of the filter. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the filter structure in an embodiment of this utility model;

[0018] Figure 2 This is a schematic diagram of the response bandwidth of the filter in an embodiment of this utility model.

[0019] In the accompanying drawings, the reference numerals represent: 1. Body; 11. Resonant cavity; 12. First coupling window; 13. First enclosing wall; 14. First base plate; 2. Pole cavity; 3. Second coupling window; 4. Second enclosing wall; 5. Second base plate; 6. Port. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0021] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] Please see Figures 1-2 This utility model provides a filter, including a body 1, which is provided with a plurality of resonant cavities 11 arranged at intervals along the length direction; a first coupling window 12 is provided between two adjacent resonant cavities 11; the filter also includes at least one pole cavity 2 protruding outward from the body 1, the pole cavity 2 is disposed on any side of any resonant cavity 11 along the width direction and is aligned with the corresponding resonant cavity 11, and the pole cavity 2 is coupled to the corresponding resonant cavity 11 through a second coupling window 3.

[0024] In this embodiment of the invention, each resonant cavity 11 has a different resonant frequency. Coupled through the first coupling window 12, the frequencies of the resonant cavities 11 can interact, thereby forming new resonant modes. This allows for fine adjustment of the filter's resonant frequency. Furthermore, the transmission bandwidth can be widened or narrowed by adjusting the coupling strength to meet specific signal processing requirements. By forming a pole cavity 2 protruding outward from the filter body 1, and coupling the pole cavity 2 and the resonant cavity 11 through the second coupling window 3, the pole cavity 2 can generate redundant frequencies in practical applications, adding poles to the filter outside the band, thus improving out-of-band rejection and meeting the requirements of high-suppression environments. Since the pole cavity 2 is not part of the filter's own resonant cavity 11, it does not affect the filter's Q value, thus greatly improving the filter's insertion loss performance and out-of-band performance. Furthermore, the number of pole cavities 2 and their placement next to the resonant cavity 11 are not limited. Thus, by adjusting the placement and number of pole cavities 2, the filter can achieve excellent insertion loss and out-of-band rejection performance, thereby improving the overall performance of the filter.

[0025] Furthermore, in some embodiments, the body 1 has a first enclosing wall 13 and a first base plate 14. The first enclosing wall 13 is arranged along the circumferential direction, and the first enclosing wall 13 and the first base plate 14 form a first enclosing space. A plurality of resonant cavity bodies 11 are spaced apart in the first enclosing space. A first coupling window 12 is formed in the first enclosing space, and the pole cavity body 2 protrudes out of the first enclosing wall 13.

[0026] Specifically, the main body 1 can be primarily rectangular in shape, with an opening at the top. The perimeter of the main body 1 can be a first enclosing wall 13, and the bottom panel of the main body 1 can be a first base plate 14. The connection between the first enclosing wall and the first base plate 14 forms a first enclosed space. Within the first enclosed space, multiple resonant cavity chambers 11 can be arranged at intervals along the length of the main body 1. Furthermore, within the first enclosed space, the air passage between two adjacent resonant cavity chambers 11 can form a first coupling window 12, allowing coupling between the multiple resonant cavity chambers 11 through the first coupling window 12. Outside the first enclosed space, pole chambers 2 protruding from the first enclosing wall 13 are provided. This allows out-of-band poles to be generated outside the main body 1, enabling the filter to achieve excellent insertion loss and out-of-band rejection performance.

[0027] Furthermore, in some embodiments, a plurality of second enclosing walls 4 protrude outward from the first enclosing wall 13, and a plurality of second bottom plates 5 protrude outward from the first bottom plate 14. The second enclosing walls 4 and the second bottom plates 5 correspond one-to-one, and the second enclosing walls 4 and the second bottom plates 5 form a second enclosing space. The first enclosing space and the second enclosing space are connected. An pole cavity 2 is provided in the second enclosing space, and the pole cavity 2 corresponds one-to-one with the second enclosing space.

[0028] Specifically, each pole cavity 2 corresponds to a second enclosing wall 4 and a second base plate 5, forming a second enclosing space. The second enclosing wall 4 can be mainly U-shaped and connected to the first enclosing wall 13. At the connection point with the first enclosing wall 13, the first enclosing wall 13 has an opening, thus enabling communication between the second enclosing space and the first enclosing space. This allows an air channel to exist between the pole cavity 2 and the corresponding resonant cavity 11 located in the second enclosing space. This air channel is the second coupling window 3 between the pole cavity 2 and the resonant cavity 11, allowing the pole cavity 2 and the resonant cavity 11 to be coupled together through the second coupling window 3.

[0029] Furthermore, in some embodiments, the first enclosing wall 13 includes a first sidewall and a second sidewall disposed along the width direction, and a plurality of second enclosing walls 4 protruding outward from the first sidewall, and / or a plurality of second enclosing walls 4 protruding outward from the second sidewall.

[0030] Specifically, along the width direction, the two sides of the first enclosing wall 13 are respectively the first sidewall and the second sidewall. The first and second sidewalls can both be connected to the second enclosing wall 4, or only the first sidewall can be connected to the second enclosing wall 4, or only the second sidewall can be connected to the second enclosing wall 4. That is, the pole cavity 2 can be located on any side of the body 1 along the width direction, as long as the pole cavity 2 and the resonant cavity 11 are aligned along the width direction. In other words, the pole cavity 2 can be located next to any resonant cavity, thus allowing the position of the pole cavity 2 to be unrestricted, enriching the filter design. By changing the position of the pole cavity 2, the frequency of the pole cavity 2 can be changed, thereby changing the out-of-band pole of the filter and enhancing the filter's practicality. Furthermore, the number of pole cavities 2 is not limited. Thus, by changing the number of pole cavities 2, the frequency of the pole cavity 2 can also be changed, thereby changing the out-of-band pole of the filter and further enhancing the filter's practicality.

[0031] Furthermore, in some embodiments, the pole cavity 2 includes a circular cavity, a square cavity, or an irregularly shaped cavity. Specifically, by changing the shape of the pole cavity 2, the frequency generated by the pole cavity 2 can also be changed, thereby altering the out-of-band poles of the filter and enhancing the practicality of the filter.

[0032] Furthermore, in some embodiments, the body 1 includes a first resonant cavity, a second resonant cavity, a third resonant cavity, a fourth resonant cavity, a fifth resonant cavity, and a sixth resonant cavity arranged sequentially along the length direction. The body 1 has a first pole cavity and a second pole cavity protruding outward from one side along the width direction, wherein the first pole cavity and the second resonant cavity are aligned along the width direction, and the second pole cavity and the fifth resonant cavity are aligned along the width direction.

[0033] Specifically, the filter body 1 is provided with six resonant cavity bodies 11, and a first pole cavity body is provided on one side of the second resonant cavity body along its width direction; simultaneously, a second pole cavity body is provided next to the fifth resonant cavity. This allows the filter body 1 to generate poles outside the band, which can greatly improve the filter's insertion loss performance and out-of-band performance. This configuration enables the filter of this embodiment to have a passband of 1800MHz and easily achieve high-frequency suppression greater than 80dB at 1860MHz, wherein the filter response bandwidth is as follows... Figure 2 As shown, compared with traditional filters, this embodiment of the invention adds poles outside the band, improving out-of-band rejection by 40dB, resulting in superior overall filter performance.

[0034] In other embodiments, the second pole cavity and the first pole cavity can be located on different sides of the body 1 along the width direction. In this way, the frequency of the pole cavity 2 can be changed by changing the position of the pole cavity 2, thereby changing the out-of-band pole of the filter and enhancing the practicality of the filter.

[0035] Furthermore, in some specific embodiments, the body 1 includes a first resonant cavity, a second resonant cavity, a third resonant cavity, a fourth resonant cavity, a fifth resonant cavity, and a sixth resonant cavity arranged sequentially along the length direction. A first pole cavity and a second pole cavity protrude outward from one side of the body 1 along the width direction, wherein the first pole cavity and the second resonant cavity are aligned along the width direction, and the second pole cavity and the fifth resonant cavity are aligned along the width direction. A third pole cavity protrudes outward from the other side of the body 1 along the width direction, wherein the third pole cavity and the fourth resonant cavity are aligned along the width direction.

[0036] Specifically, in addition to the six resonant cavities, the first pole cavity, and the second pole cavity, the main body 1 also has a third pole cavity on the side opposite the first pole cavity along the width direction. The third pole cavity can be aligned with the fourth resonant cavity along the width direction. Similarly, this allows the filter body 1 to generate poles outside the band, significantly improving the filter's insertion loss and out-of-band performance. Furthermore, by increasing the number of pole cavities 2, the frequency of the pole cavities 2 can be changed, thereby altering the filter's out-of-band poles and further enhancing the filter's practicality.

[0037] In other embodiments, the third pole cavity can be located on the same side of the first pole cavity along the width direction. Thus, by changing the position of pole cavity 2, the frequency of pole cavity 2 can be changed, thereby altering the out-of-band poles of the filter and enhancing its practicality.

[0038] Furthermore, in some specific embodiments, the body 1 includes a first resonant cavity, a second resonant cavity, a third resonant cavity, a fourth resonant cavity, a fifth resonant cavity, and a sixth resonant cavity arranged sequentially along the length direction. A first pole cavity and a second pole cavity protrude outward from one side of the body 1 along the width direction, wherein the first pole cavity and the second resonant cavity are aligned along the width direction, and the second pole cavity and the fifth resonant cavity are aligned along the width direction. A third pole cavity and a fourth pole cavity protrude outward from the other side of the body 1 along the width direction, wherein the third pole cavity and the third resonant cavity are aligned along the width direction, and the fourth pole cavity and the fifth resonant cavity are aligned along the width direction.

[0039] Specifically, in addition to the six resonant cavities, the first pole cavity, and the second pole cavity, the main body 1 also has a third pole cavity and a fourth pole cavity on the side opposite to the first pole cavity along the width direction. The third pole cavity can be aligned with the third resonant cavity along the width direction; the fourth pole cavity can be aligned with the fifth resonant cavity along the width direction. Similarly, this allows the filter body 1 to generate poles outside the band, which can greatly improve the filter's insertion loss performance and out-of-band performance. Furthermore, by increasing the number of pole cavities 2, the frequency of the pole cavities 2 can be changed, thereby altering the out-of-band poles of the filter and further enhancing the filter's practicality.

[0040] In other embodiments, the third pole cavity can be located on the same side of the first pole cavity along the width direction. Thus, by changing the position of pole cavity 2, the frequency of pole cavity 2 can be changed, thereby altering the out-of-band poles of the filter and enhancing its practicality.

[0041] Furthermore, in some specific embodiments, the body 1 includes a first resonant cavity, a second resonant cavity, a third resonant cavity, a fourth resonant cavity, a fifth resonant cavity, and a sixth resonant cavity arranged sequentially along the length direction. A first pole cavity and a second pole cavity protrude outward from one side of the body 1 along the width direction, wherein the first pole cavity and the second resonant cavity are aligned along the width direction, and the second pole cavity and the fifth resonant cavity are aligned along the width direction. A third pole cavity, a fourth pole cavity, and a fifth pole cavity protrude outward from the other side of the body 1 along the width direction, wherein the third pole cavity and the second resonant cavity are aligned along the width direction, the fourth pole cavity and the third resonant cavity are aligned along the width direction, and the fifth pole cavity and the fourth resonant cavity are aligned along the width direction.

[0042] Specifically, in addition to the six resonant cavities, the first pole cavity, and the second pole cavity, the main body 1 also has a third pole cavity, a fourth pole cavity, and a fifth pole cavity on the side opposite the first pole cavity along the width direction. The third pole cavity can be aligned with the second resonant cavity along the width direction; the fourth pole cavity can be aligned with the third resonant cavity along the width direction; and the fifth pole cavity can be aligned with the fourth resonant cavity along the width direction. Similarly, this allows the filter body 1 to generate poles outside the band, which can greatly improve the filter's insertion loss performance and out-of-band performance. Furthermore, by increasing the number of pole cavities 2, the frequency of the pole cavities 2 can be changed, thereby changing the out-of-band poles of the filter and further enhancing the filter's practicality.

[0043] In other embodiments, the fourth pole cavity may be located on the same side of the first pole cavity along the width direction; and / or, the fifth pole cavity may be located on the same side of the first pole cavity along the width direction. Thus, by changing the position of the pole cavity 2, the frequency of the pole cavity 2 can be changed, thereby altering the out-of-band poles of the filter and enhancing its practicality.

[0044] Understandably, in addition to the number and positional relationship of the pole cavity 2 in the above embodiments, the number and position of the pole cavity 2 can be adjusted according to actual needs, thereby changing the frequency of the pole cavity 2, thereby changing the out-of-band poles of the filter and enhancing the practicality of the filter.

[0045] Furthermore, in some embodiments, the number of resonant cavity 11 can be 2, 3, 4, 5, 7, 8, 9 or 10, etc., so that the pole cavity 2 can have more configuration forms, enhancing the practicality of the filter.

[0046] Furthermore, in some embodiments, ports 6 are respectively provided at both ends of the body 1 along its length. The signal transmission of the filter can be realized through the ports 6.

[0047] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0048] The above is a description of the technical solution provided by this utility model. For those skilled in the art, based on the ideas of the embodiments of this utility model, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A filter, characterized in that, The filter includes a body, which has a plurality of resonant cavities spaced apart along its length; a first coupling window is provided between two adjacent resonant cavities; the filter also includes at least one pole cavity protruding outward from the body, the pole cavity being disposed on any side of any of the resonant cavities along its width and aligned with the corresponding resonant cavity, and the pole cavity being coupled to the corresponding resonant cavity through a second coupling window.

2. The filter according to claim 1, characterized in that, The body has a first enclosing wall and a first bottom plate. The first enclosing wall is arranged along the circumferential direction, and the first enclosing wall and the first bottom plate form a first enclosing space. A plurality of the resonant cavities are spaced apart within the first enclosed space; the first coupling window is formed in the first enclosed space, and the pole cavity protrudes outside the first enclosed wall.

3. The filter according to claim 2, characterized in that, The first enclosing wall has several second enclosing walls protruding outwards, and the first base plate has several second base plates protruding outwards. The second enclosing walls and the second base plates correspond one-to-one. The second enclosing walls and the second base plates form a second enclosing space. The first enclosing space and the second enclosing space are connected. The pole cavity is provided in the second enclosing space. The pole cavity corresponds one-to-one with the second enclosing space.

4. The filter according to claim 3, characterized in that, The first enclosing wall includes a first sidewall and a second sidewall arranged along the width direction, and a plurality of second enclosing walls protrude outward from the first sidewall, and / or a plurality of second enclosing walls protrude outward from the second sidewall.

5. The filter according to claim 1, characterized in that, The pole cavity includes a circular cavity, a square cavity, or an irregularly shaped cavity.

6. The filter according to claim 1, characterized in that, The main body includes a first resonant cavity, a second resonant cavity, a third resonant cavity, a fourth resonant cavity, a fifth resonant cavity, and a sixth resonant cavity arranged sequentially along the length direction. A first pole cavity and a second pole cavity protrude outward from one side of the main body along the width direction. The first pole cavity and the second resonant cavity are aligned along the width direction, and the second pole cavity and the fifth resonant cavity are aligned along the width direction.

7. The filter according to claim 6, characterized in that, The body has a third pole cavity protruding outward along the other side of the width direction, wherein the third pole cavity and the fourth resonant cavity are aligned along the width direction.

8. The filter according to claim 6, characterized in that, The main body has a third pole cavity and a fourth pole cavity protruding outward along the other side of the width direction, wherein the third pole cavity and the third resonant cavity are aligned along the width direction, and the fourth pole cavity and the fifth resonant cavity are aligned along the width direction.

9. The filter according to claim 6, characterized in that, The main body has a third pole cavity, a fourth pole cavity, and a fifth pole cavity protruding outward along the other side of the width direction. The third pole cavity and the second resonant cavity are aligned along the width direction, the fourth pole cavity and the third resonant cavity are aligned along the width direction, and the fifth pole cavity and the fourth resonant cavity are aligned along the width direction.

10. The filter according to claim 1, characterized in that, The main body has ports at both ends along its length.

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