Filter and communication equipment

Abstract

The invention provides a filter and communication equipment, the filter comprises a shell, a partition plate and a plurality of resonant cavities distributed at two sides of the partition plate are arranged in the shell, resonators are arranged in the resonant cavities, and the resonators distributed at two sides of the partition plate are respectively connected to the partition plate so as to be grounded through the partition plate. The partition plate is provided with a window, and the resonators corresponding to the two sides of the partition plate are capacitively coupled through the window. The resonant cavities are arranged on the two sides of the partition plate respectively, the high performance of the filter is kept, meanwhile, compactness and integration of the structure are achieved, the size and the weight of the filter can be reduced, and the filter can be better applied in a limited space. The reasonable layout of the internal structure of the filter helps to reduce electromagnetic interference and leakage, and improves the stability and reliability of the filter. This is particularly important for a filter working in a complex electromagnetic environment.

Description

Technical Field

[0001] The present invention belongs to the technical field of mobile communications, and in particular relates to a filter and a communication device equipped with the filter. Background Art

[0002] Filters play an important role in the field of mobile communications. As part of the RF front end, different forms of filters play an important role in filtering out unwanted signals in the frequency domain while retaining the desired signals in their respective systems.

[0003] The large-scale promotion and application of 5G, as well as the anticipated demand for 6G in the future, have forced the integration of various modules in base station equipment to continue to increase. The application of large-scale MIMO also requires the filters in base station equipment to be more compact. Therefore, customers' requirements for the comprehensive performance of filter devices continue to increase. This includes not only traditional electrical properties such as loss, suppression, power, and intermodulation, but also requirements such as volume, weight, and installation and matching methods are becoming increasingly important. Miniaturization and lightweight are increasingly becoming the mainstream technical direction of filters in this major technical context.

[0004] In order to meet the above needs, miniaturized metal filters have gradually become the mainstream choice in the industry. Based on different implementation forms, this type of filter can be further divided into miniaturized coaxial cavity filters, sheet metal filters and other types. However, conventional miniaturized filters have many difficulties in assembly and dimensional accuracy. In order to solve these problems, the industry has introduced integrated filter design and implementation methods.

[0005] Specifically, the integrated filter, while solving the assembly and dimensional accuracy problems of conventional miniaturized filters, also brings new technical problems. Due to the reduction of internal parts and the highly integrated design of the filter, it becomes more difficult to achieve complex topological structures and multiple cross-couplings. In addition, during the processing of the integrated filter, due to the limitations of the process flow, problems such as uneven local shrinkage and deformation are difficult to avoid. These problems not only affect the performance of the filter, but also bring great challenges to subsequent production and debugging. Summary of the invention

[0006] The primary objective of the present invention is to solve at least one of the above problems and provide a filter and a communication device.

[0007] In order to meet the various objectives of the present invention, the present invention adopts the following technical solutions:

[0008] A filter is provided to meet one of the purposes of the present invention, including a housing, a partition and a plurality of resonant cavities distributed on both sides of the partition are provided in the housing, a resonator is provided in the resonant cavity, each of the resonators distributed on both sides of the partition is respectively connected to the partition to be grounded through the partition, the partition is provided with a window, and the corresponding resonators on both sides of the partition are capacitively coupled through the window. Further, the resonator is provided with a grounding portion, the grounding portion is connected to the partition, the resonator is grounded through the grounding portion, and the grounding portions corresponding to each of the plurality of resonators are respectively provided on both sides of the partition.

[0009] In one embodiment, the spacing between two adjacent coupled resonators is less than half the height of the resonators.

[0010] In one embodiment, the resonant cavities of two adjacent and compatibly coupled resonators are located on the same side of the partition, and a partition bar is formed between the two resonators. The partition bar connects the partition plate and the inner wall of the shell to separate the two resonators.

[0011] In one embodiment, at least one window is provided on the partition, and two adjacent resonators disposed on both sides of the partition are inductively coupled via corresponding windows.

[0012] In one embodiment, the area and / or shape of the window is associated with the coupling strength between the two resonators.

[0013] In one embodiment, the plurality of resonant cavities sequentially constitute a first CQ structure, a CT structure, and a second CQ structure, and the partition is provided with at least one window corresponding to the first CQ structure, the CT structure, and the second CQ structure, respectively.

[0014] In one embodiment, when multiple resonators in the first CQ structure or the CT structure or the second CQ structure are coupled through the same window, the coupling strength between the multiple resonators is adjusted by adjusting the position of the central axis of the window.

[0015] In one embodiment, a first coupling adjustment structure is formed between the two resonators, and the first coupling adjustment structure is arranged on one side of the window.

[0016] In one embodiment, a second coupling adjustment structure is formed between the two resonators, and the second coupling adjustment structure includes a notch opened on the window.

[0017] In one embodiment, a third coupling adjustment structure is formed between the two resonators, and the third coupling adjustment structure is arranged on the corresponding windows of the two resonators.

[0018] In one embodiment, a coupling connecting piece is provided between two adjacent resonators that are located on the same side of the partition and are inductively coupled, and the coupling connecting piece connects the two resonators.

[0019] In one embodiment, the shell, the partition and the resonator are integrally formed.

[0020] In one embodiment, the resonator includes an extension arm and a resonant ring, one end of the extension arm forms the grounding portion, and the other end of the extension arm is connected to the resonant ring.

[0021] In one embodiment, the plurality of resonant cavities sequentially constitute a first CQ structure, a CT structure, and a second CQ structure, and the first CQ structure and the second CQ structure are electrically connected via the CT structure.

[0022] In one embodiment, the partition separates the shell to form two cavities, the first CQ structure includes four resonant cavities, and the four resonant cavities are evenly divided into the two cavities; the CT structure includes three resonant cavities, one of the three resonant cavities is arranged in one of the cavities, and the other two resonant cavities are arranged in the other cavity; the second CQ structure includes four resonant cavities, and the four resonant cavities are evenly divided into the two cavities.

[0023] In one embodiment, in the first CQ structure and / or the second CQ structure, two resonators arranged in the same cavity are inductively coupled or capacitively coupled, and two resonators arranged in different cavities are inductively coupled.

[0024] In one embodiment, in the CT structure, two resonators arranged in the same cavity are inductively coupled or capacitively coupled, and two resonators arranged in different cavities are inductively coupled or uncoupled.

[0025] In one embodiment, one of the resonators of the CT structure is coupled with a resonator of the first CQ structure or two resonators arranged in different cavities; another resonator of the CT structure is shared with the second CQ structure, and the other resonator is coupled with the other two resonators of the CT structure.

[0026] In order to meet one of the purposes of the present invention, a communication device is provided, comprising the filter as described in any one of the preceding purposes.

[0027] Compared with the prior art, the present invention has many advantages, including but not limited to:

[0028] For the first time, the present invention sets a partition in the shell and sets the resonant cavity on both sides of the partition. While maintaining high performance, the filter achieves compactness and integration in structure, which helps to reduce the volume and weight of the filter and enable it to be better applied in a limited space. The reasonable layout of the internal structure of the filter helps to reduce electromagnetic interference and leakage and improve the stability and reliability of the filter. This is especially important for filters working in complex electromagnetic environments.

[0029] Secondly, the resonator in each resonant cavity is grounded through the partition, which ensures a good ground connection, helps reduce signal interference and loss, and enhances the stability and filtering efficiency of the filter. The capacitive coupling between the resonators is achieved through the window on the partition. This non-direct contact coupling method can flexibly adjust the frequency response characteristics of the filter without adding additional losses, achieving a more refined filtering effect.

[0030] Furthermore, the partition and the window thereon help optimize the electromagnetic field distribution inside the filter, reduce electromagnetic leakage and interference, and thus enhance the electromagnetic compatibility of the filter. Moreover, directly connecting the resonator to the partition and coupling through the window helps simplify the filter assembly process and reduce manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0032] Figure 1 FIG. 4 is an exploded schematic diagram of a filter according to a typical embodiment of the present invention.

[0033] Figure 2 The figure is a schematic top view of a housing of a filter according to a typical embodiment of the present invention.

[0034] Figure 3 4 is a topological diagram of a filter according to a typical embodiment of the present invention.

[0035] Figure 4 It is a schematic structural diagram of a housing of a filter according to a typical embodiment of the present invention.

[0036] Figure 5 for Figure 4 Magnified view of part A.

[0037] Figure 6 for Figure 4 Magnified view of part B.

[0038] Figure 7 for Figure 4 Magnified view of part C.

[0039] Figure 8The figure is a cross-sectional schematic diagram of a housing of a filter according to a typical embodiment of the present invention.

[0040] Fig. 9 FIG. 4 is a topological diagram of a filter according to another embodiment of the present invention. DETAILED DESCRIPTION

[0041] The embodiments of the present invention 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 with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention and cannot be interpreted as limiting the present invention.

[0042] It will be understood by those skilled in the art that, unless expressly stated, the singular forms "one", "said", and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be an intermediate element. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0043] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art in the art to which the present invention belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as herein.

[0044] The present invention provides a filter, wherein a plurality of resonant cavities of the filter are arranged on both sides of a partition plate to facilitate miniaturization of the filter, and the plurality of resonant cavities constitute a CT structure and two CQ structures, so that the filter can realize a complex topological structure and optimize communication performance.

[0045] In an exemplary embodiment of the present invention, Figure 1 and Figure 2The filter 100 includes a housing 110, in which a partition 150 is disposed. The partition 150 is extended along the longitudinal axis of the housing 110 to divide the housing 110 into two, thereby forming two cavities 112. In this embodiment, the partition 150 extends along the central axis of the longitudinal direction of the housing 110 to equally divide the housing 110, so that the two cavities 112 have the same shape and size.

[0046] A plurality of resonant cavities 120 are formed in the housing 110, and a resonator 121 is disposed in each resonant cavity 120. The plurality of resonant cavities 120 are disposed in the two cavities 112, that is, each cavity 112 is provided with a plurality of resonant cavities 120, and the plurality of resonant cavities 120 in the cavity 112 are sequentially arranged along the longitudinal axis.

[0047] Combination Figure 4 The resonator 121 is provided with a grounding portion 122, and the grounding portion 122 is connected to the partition 150, and the resonator 121 is grounded through the grounding portion 122. The multiple resonators 121 in the housing 110 are arranged on both sides of the partition 150 to facilitate miniaturization of the filter 100.

[0048] The multiple resonant cavities 120 of the shell 110 constitute a CT structure and two CQ structures. Specifically, the two CQ structures are a first CQ structure and a second CQ structure. The CT structure is disposed between the first CQ structure and the second CQ structure, and the first CQ structure and the second CQ structure are electrically connected via the CT structure.

[0049] In this embodiment, combined with Figure 2 and Figure 3 The first CQ structure includes four resonant cavities 120, which are respectively called a first resonant cavity 131, a second resonant cavity 132, a third resonant cavity 133 and a fourth resonant cavity 134, wherein the resonator in the first resonant cavity 131 is called a first resonator 1311, the resonator in the second resonant cavity 132 is called a second resonator 1321, the resonator in the third resonant cavity 133 is called a third resonator 1331, and the resonator in the fourth resonant cavity 134 is called a fourth resonator 1341.

[0050] In this embodiment, the two cavities 112 are referred to as the first cavity 113 and the second cavity 114, wherein the first resonant cavity 131 and the fourth resonant cavity 134 are arranged in the first cavity 113, and it can be understood that the first resonator 1311 and the fourth resonator 1341 are also correspondingly arranged in the first cavity 113; the second resonant cavity 132 and the third resonant cavity 133 are arranged in the second cavity 114, and it can be understood that the second resonator 1321 and the third resonator 1331 are arranged in the second cavity 114.

[0051] The partition plate 150 is provided with a window 151 so that the resonator 121 in the first cavity 113 and the resonator 121 in the second cavity 114 can be coupled to each other.

[0052] Combination Figure 4 and Figure 8 The partition 150 is provided with a window corresponding to the first CQ structure (the window is referred to as the first window 152), the first resonator 1311 is inductively coupled with the second resonator 1321 and the third resonator 1331 respectively through the first window 152, and the third resonator 1331 can be inductively coupled with the first resonator 1311 and the fourth resonator 1341 respectively through the first window 152.

[0053] Furthermore, the first resonator 1311 and the fourth resonator 1341 disposed in the first cavity 113 are capacitively coupled, and the second resonator 1321 and the third resonator 1331 disposed in the second cavity 114 are capacitively coupled.

[0054] Combination Figure 2 and Figure 3 The CT structure includes three resonant cavities 120, which are respectively called a fifth resonant cavity 135, a sixth resonant cavity 136 and a seventh resonant cavity 137, wherein the resonator in the fifth resonant cavity 135 is called a fifth resonator 1351, the resonator in the sixth resonant cavity 136 is called a sixth resonator 1361, and the resonator in the seventh resonant cavity 137 is called a seventh resonator 1371.

[0055] The fifth resonant cavity 135 is disposed in the first cavity 113, and the fifth resonant cavity 135 is disposed adjacent to the fourth resonant cavity 134. It can be understood that the fifth resonator 1351 is disposed in the first cavity 113, and the fifth resonator 1351 is disposed adjacent to the fourth resonator 1341. The sixth resonant cavity 120 and the seventh resonant cavity 137 are disposed in the second cavity 114, and the fifth resonant cavity 135 is disposed adjacent to the third resonant cavity 133. It can be understood that the sixth resonator 1361 and the seventh resonator 1371 are disposed in the second cavity 114, and the sixth resonator 1361 is disposed adjacent to the third resonator 1331.

[0056] Combination Figure 4 and Figure 8 The partition 150 is provided with a window corresponding to the CT structure (the window is referred to as the second window 153), and the fifth resonator 1351 is inductively coupled with the sixth resonator 1361 and the seventh resonator 1371 respectively through the second window 153. Moreover, the fifth resonator 1351 is also inductively coupled with the fourth resonator 1341 of the first CQ structure. The sixth resonator 1361 and the seventh resonator 1371 disposed in the second cavity 114 are capacitively coupled.

[0057] Combination Figure 2 and Figure 3 The second CQ structure includes four resonant cavities 120, one of which is the seventh resonant cavity 137, that is, the second CQ structure and the CT structure share the seventh resonant cavity 137. The remaining three resonant cavities 120 of the second CQ structure are the eighth resonant cavity 138, the ninth resonant cavity 139, and the tenth resonant cavity 141. The resonator in the eighth resonant cavity 138 is called the eighth resonator 1381, the resonator in the ninth resonant cavity 139 is called the ninth resonator 1391, and the resonator in the tenth resonant cavity 141 is called the tenth resonator 1411.

[0058] The eighth resonant cavity 138 and the ninth resonant cavity 139 are disposed in the first cavity 113 , the eighth resonant cavity 138 and the fifth resonant cavity 135 are disposed adjacent to each other, and the seventh resonant cavity 137 and the tenth resonant cavity 141 are disposed in the second cavity 114 .

[0059] In this embodiment, combined with Figure 4 and Figure 8A third window 154 is formed on the partition 150 , and the third window 154 is disposed between the seventh resonator 1371 and the eighth resonator 1381 , so that the seventh resonator 1371 and the eighth resonator 1381 are inductively coupled via the third window 154 .

[0060] The partition plate 150 is also provided with a fourth window 155 , which is disposed between the eighth resonator 1381 , the ninth resonator 1391 and the tenth resonator 1411 , so that the tenth resonator 1411 is inductively coupled with the eighth resonator 1381 and the ninth resonator 1391 through the fourth window 155 .

[0061] The eighth resonator 1381 and the ninth resonator 1391 disposed in the first cavity 113 are capacitively coupled, and the seventh resonator 1371 and the tenth resonator 1411 disposed in the second cavity 114 are inductively coupled.

[0062] Combination Figure 3 The filter 100 is further provided with an input port 161 and an output port 162. The input port 161 is used to introduce an external signal into the filter 100, and the output port 162 is used to output the filtered signal to the outside. In this embodiment, the input port 161 is connected to the first resonator 1311, and the output port 162 is connected to the tenth resonator 1411.

[0063] Thus, the first CQ structure and the second CQ structure are electrically connected through the CT structure, providing a flexible electrical connection path. The CT structure is not only a part of the electrical connection, but can also be used to adjust the degree of coupling between the two CQ structures, thereby further adjusting the performance of the filter 100. Moreover, the resonant cavity 120 in the filter 100 is arranged in the order of the first CQ structure, the CT structure and the second CQ structure, so that the filter 100 has a better optimization effect on the frequency response. The CQ structure helps to provide a flat passband and a steep transition band, while the CT structure can adjust and optimize the frequency characteristics to meet the filtering requirements.

[0064] In a typical embodiment of the present invention, the housing 110 is made of a metal material, and the housing 110 and the partition 150 and the resonator 121 inside the housing 110 are integrally formed to improve the structural integrity of the housing 110, and improve the structural stability, avoid the generation of gaps, and thus optimize the communication performance of the filter 100. In this embodiment, it is recommended that the housing 110 is formed by cylindrical cutting to reduce the deformation generated during the integral processing, improve the structural stability of the housing 110, and avoid the generation of gaps.

[0065] In one embodiment, in combination Figure 2 , Figure 3 and Figure 4 All the resonators 121 have the same height. Among the multiple resonators 121 in the housing 110, the distance between two adjacent and coupled resonators 121 is less than half of the height of the resonator 121, so as to increase the volume of the resonant cavity 120 in disguised form, which is beneficial to the reduction of the resonant frequency. That is to say, compared with the traditional filter of the same frequency, the space required by the filter 100 of the present invention becomes smaller, thereby facilitating the miniaturization of the filter 100 of the present invention.

[0066] Specifically, when two adjacent resonators 121 in the same cavity 112 are coupled, the distance between the two resonators 121 is less than half the height of the resonator 121. For example, the distance between the second resonator 1321 and the third resonator 1331 is less than half the height of the resonator 121. For another example, the distance between the seventh resonator 1371 and the tenth resonator 1411 is less than half the height of the resonator 121.

[0067] When two adjacent resonators 121 in different cavities 112 are coupled, the distance between the two resonators 121 is also less than half the height of the resonator 121 . For example, the distance between the first resonator 1311 and the third resonator 1331 is less than half the height of the resonator 121 .

[0068] In one embodiment, in combination Figure 2 , Figure 3 and Figure 4 Among the multiple resonators 121 in the housing 110, two adjacent and compatibly coupled resonators 121 are located in the same cavity 112, so that the two resonators 121 are compatibly coupled. For example, the second resonator 1321 and the third resonator 1331 located in the first cavity 113 are capacitively coupled. Figure 8 A coupling portion 123 is also formed on the top of the resonator 121, and the coupling portion 123 is protruded toward the resonator 121 with which it is capacitively coupled, so that the two resonators 121 with capacitive coupling can implement capacitive coupling through their respective coupling portions 123 to improve coupling efficiency. In this embodiment, a bending surface 1231 is also formed on the coupling portion 123 to increase the coupling area through the bending surface 1231 and improve the capacitive coupling efficiency.

[0069] In a further embodiment, in combination Figure 4 and Figure 8A partition bar 124 is formed between two adjacent and compatibly coupled resonators 121, one end of the partition bar 124 is connected to the partition plate 150, and the other end is connected to the inner wall of the housing 110 to separate the two adjacent and compatibly coupled resonators 121. The partition bar 124 can hinder the inductive coupling transmission without affecting the capacitive coupling, so as to optimize the capacitive coupling performance between the two capacitively coupled resonators 121.

[0070] Furthermore, the spacer 124 can enhance the structural strength of the shell 110 , support the internal structure of the shell 110 , and reduce deformation of the shell 110 during one-piece processing, so as to enhance the structural strength of the filter 100 , thereby enhancing the communication performance of the filter 100 .

[0071] In one embodiment, in combination Figure 4 and Figure 8 , the area and / or shape of the window 151 can be controlled to control the coupling strength between the two resonators 121 inductively coupled through the window 151. By controlling the shape of the window 151, the blocking between the two resonators 121 inductively coupled through the window 151 can be reduced, thereby improving the inductive coupling strength. When the area of ​​the window 151 increases, the blocking between the two resonators 121 inductively coupled through the window 151 is reduced, thereby improving the coupling strength; conversely, when the area of ​​the window 151 decreases, the inductive coupling strength decreases. For example, the area of ​​the first window 152 is increased to improve the inductive coupling strength between the first resonator 1311 and the third resonator 1331.

[0072] In a further embodiment, when three or more resonators 121 are coupled through the same window 151, the coupling strength between the three or more resonators 121 can be adjusted by adjusting the position of the central axis of the window 151. For ease of description, this embodiment is described by taking the first window 152 as an example. The four resonators 121 of the first CQ structure are coupled through the first window 152, wherein the inductive coupling between the first resonator 1311 and the second resonator 1321 is relatively small, while the inductive coupling between the first resonator 1311 and the third resonator 1331 is relatively large, and the inductive coupling between the third resonator 1331 and the fourth resonator 1341 is relatively large. The central axis of the first window 152 is offset toward the position of the fourth resonator 1341 to increase the inductive coupling strength between the first resonator 1311 and the second resonator 1321, thereby optimizing the communication performance of the filter 100.

[0073] In one embodiment, in combination Figure 4 and Figure 5A first coupling adjustment structure 171 is provided between two adjacent and inductively coupled resonators 121 disposed in different cavities 112, and the first coupling adjustment structure 171 is provided on one side of the corresponding window 151. By providing the first coupling adjustment structure 171, the inductive coupling strength between the two resonators 121 can be increased, and the communication performance of the filter 100 can be optimized. In this embodiment, it is recommended that the first coupling adjustment structure 171 be a triangular-like structure, but this should not be understood as a limitation to the present invention.

[0074] The following describes this embodiment by taking the first coupling adjustment structure 171 disposed between the seventh resonator 1371 and the eighth resonator 1381 as an example, but it should not be understood as limiting the invention. The seventh resonator 1371 and the eighth resonator 1381 are inductively coupled through the third window 154, and the first coupling adjustment structure 171 is disposed on one side of the third window 154. In this embodiment, the first coupling adjustment structure 171 is disposed on the side of the third window 154 close to the seventh resonator 1371. The first coupling adjustment structure 171 can increase the inductive coupling strength between the seventh resonator 1371 and the eighth resonator 1381, thereby optimizing the communication performance of the filter 100.

[0075] In one embodiment, in combination Figure 4 and Figure 6 A second coupling adjustment structure 172 is provided between two adjacent and inductively coupled resonators 121 disposed in different cavities 112. The second coupling adjustment structure 172 includes a notch 1721 provided on the corresponding window 151. The second coupling adjustment structure 172 is used to reduce the inductive coupling strength between the two resonators 121 to prevent the inductive coupling from being too strong. In this embodiment, the window 151 is disconnected by the second coupling adjustment structure 172, so that the window 151 is divided into two.

[0076] The following describes this embodiment by taking the second coupling adjustment structure 172 disposed on the first window 152 as an example, but it should not be understood as limiting the present invention. The inductive coupling strength between the first resonator 1311 and the third resonator 1331 is too large, and the second coupling adjustment structure 172 is disposed on the first window 152, and the first window 152 is disconnected by the second coupling adjustment structure 172 to reduce the inductive coupling strength between the first resonator 1311 and the third resonator 1331, thereby optimizing the communication performance of the filter 100.

[0077] In one embodiment, in combination Figure 4 and Figure 7A third coupling adjustment structure 173 is provided between two adjacent and inductively coupled resonators 121 disposed in different cavities 112, and the third coupling adjustment structure 173 is disposed on the windows 151 corresponding to the two resonators 121. Specifically, the third coupling adjustment structure 173 is protruded from the windows 151 toward the top of the housing 110 to block the inductive coupling between the two resonators 121, reduce the inductive coupling strength, avoid excessive inductive coupling strength, and optimize the communication performance of the filter 100. In this embodiment, it is recommended that the third coupling adjustment structure 173 is in a strip shape, but this is not to be construed as a limitation to the present invention.

[0078] The present embodiment is described below by taking the third coupling adjustment structure 173 disposed on the fourth window 155 as an example, but it should not be understood as limiting the present invention. The inductive coupling strength between the eighth resonator 1381 and the tenth resonator 1411 is too large, and the third coupling adjustment structure 173 is disposed on the fourth window 155 to block the inductive coupling between the eighth resonator 1381 and the tenth resonator 1411, so as to reduce the inductive coupling between the eighth resonator 1381 and the tenth resonator 1411, thereby optimizing the communication performance of the filter 100.

[0079] In one embodiment, in combination Figure 4 and Figure 8 A coupling connecting piece 174 is provided between two adjacent and inductively coupled resonators 121 arranged in the same cavity 112, and the two ends of the coupling connecting piece 174 are respectively connected to the two resonators 121. The two resonators 121 are directly connected through the coupling connecting piece 174 to reduce the inductive coupling between the two resonators 121, avoid excessive inductive coupling strength, and optimize the communication performance of the filter 100.

[0080] The following describes this embodiment by taking the two ends of the coupling connecting piece 174 as connecting the seventh resonator 1371 and the tenth resonator 1411, but it should not be understood as limiting the present invention. The inductive coupling between the seventh resonator 1371 and the tenth resonator 1411 is too strong, and one end of the coupling connecting piece 174 is connected to the seventh resonator 1371, and the other end is connected to the tenth resonator 1411, thereby reducing the inductive coupling strength between the seventh resonator 1371 and the tenth resonator 1411, and optimizing the communication performance of the filter 100.

[0081] In an exemplary embodiment of the present invention, Figure 1The filter 100 further includes a top cover 181, a bottom cover 182 and a plurality of tuning screws 183. The top cover 181 covers the top opening of the shell 110, and the bottom cover 182 covers the bottom opening of the shell 110. In the present embodiment, it is recommended that the bottom cover 182 and the shell 110 be integrally formed, but this should not be construed as a limitation to the present invention.

[0082] The top of the resonator 121 faces the top cover 181 , and the multiple tuning screws 183 are arranged corresponding to the multiple resonators 121 in the shell 110 . The adjusting screw passes through the top cover 181 and is inserted into the corresponding resonator 121 to tune the working frequency of the resonator 121 through the tuning screw 183 .

[0083] In one embodiment, in combination Figure 8 The resonator 121 includes an extension arm 125 and a resonant ring 126, wherein one end of the extension arm 125 forms the grounding portion 122, and the grounding portion 122 is connected to the partition 150 to achieve grounding. The other end of the extension arm 125 is connected to the resonant ring 126, and the resonant ring 126 is located above the grounding portion 122. The adjusting screw is inserted into the resonant ring 126 to tune the operating frequency of the filter 121.

[0084] In another embodiment, the resonator 121 is a column structure.

[0085] In one embodiment, in combination Fig. 9 , the arrangement of the ten resonant cavities 120 in the housing 110 is changed to form another topological structure. The first resonant cavity 131, the second resonant cavity 132, the third resonant cavity 133 and the fourth resonant cavity 134 form a first CQ structure, the first resonant cavity 131 and the second resonant cavity 132 are arranged in the first cavity 113, the third resonant cavity 133 and the fourth resonator 1341 are arranged in the second cavity 114, the second resonator 1321 is inductively coupled with the first resonator 1311, the third resonator 1331 and the fourth resonator 1341 respectively, the fourth resonator 1341 is also inductively coupled with the first resonator 1311, and the third resonator 1331 is capacitively coupled with the fourth resonator 1341.

[0086] The fifth resonant cavity 135, the sixth resonant cavity 136 and the seventh resonant cavity 137 form a CT structure. The fifth resonant cavity 135 and the sixth resonant cavity 136 are disposed in the second cavity 114, the seventh resonant cavity 137 is disposed in the first cavity 113, and the sixth resonator 1361 is inductively coupled to the fifth resonator 1351 and the seventh resonator 1371 respectively.

[0087] The sixth resonant cavity 136, the eighth resonant cavity 138, the ninth resonant cavity 139 and the tenth resonant cavity 141 constitute a second CQ structure. The sixth resonant cavity 136 and the tenth resonant cavity 141 are arranged in the second cavity 114, the eighth resonant cavity 138 and the ninth resonant cavity 139 are arranged in the first cavity 113, the eighth resonator 1381 is inductively coupled with the sixth resonator 1361 and the tenth resonator 1411 respectively, the eighth resonator 1381 is also capacitively coupled with the seventh resonator 1371 and the ninth resonator 1391 respectively, and the tenth resonator 1411 is inductively coupled with the eighth resonator 1381 and the ninth resonator 1391 respectively.

[0088] The input port 161 is connected to the first resonator 1311 , and the output port 162 is connected to the tenth resonator 1411 .

[0089] Therefore, the filter 100 of the present invention can form different topological structures to achieve corresponding communication functions.

[0090] The present invention further provides a communication device, wherein the communication device comprises the filter 100 described above.

[0091] In one embodiment, the communication device is a duplexer, and the filter 100 described above is built in the duplexer.

[0092] In one embodiment, the communication device is a combiner, and the filter 100 described above is built in the combiner.

[0093] In one embodiment, the communication device is an antenna, and the filter 100 described above is disposed in the antenna.

[0094] In summary, the filter of the present invention is provided with multiple resonant cavities, which are arranged on both sides of the partition, and the multiple resonant cavities constitute a CT structure and two CQ structures to optimize the communication performance of the filter, and the shell of the filter is integrally formed to facilitate production.

[0095] The above description is only a preferred embodiment of the present invention and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present invention is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the above features are replaced with the technical features with similar functions invented in the present invention (but not limited to) to form a technical solution.

[0096] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

Claims

1. A filter, characterized in that: The invention comprises a shell, wherein a partition and a plurality of resonant cavities distributed on both sides of the partition are arranged in the shell, a resonator is arranged in the resonant cavity, and each of the resonators distributed on both sides of the partition is respectively connected to the partition to be grounded through the partition, and the partition is provided with a window, and capacitive coupling is achieved between the corresponding resonators on both sides of the partition through the window.

2. The filter according to claim 1, characterized in that The resonator is provided with a grounding portion, the grounding portion is connected to the partition, the resonator is grounded via the grounding portion, and the grounding portions corresponding to the multiple resonators are respectively arranged on both sides of the partition.

3. The filter according to claim 1, characterized in that The distance between two adjacent and coupled resonators is less than half of the height of the resonators.

4. The filter according to claim 1, characterized in that The resonant cavities of the two adjacent and compatibly coupled resonators are located on the same side of the partition, and a partition bar is formed between the two resonators. The partition bar connects the partition plate and the inner wall of the shell to separate the two resonators.

5. The filter according to claim 1, characterized in that At least one window is provided on the partition, and two adjacent resonators disposed on both sides of the partition are inductively coupled via corresponding windows.

6. The filter according to claim 5, characterized in that The area and / or shape of the window is related to the coupling strength between the two resonators.

7. The filter according to claim 5, characterized in that The multiple resonant cavities sequentially constitute a first CQ structure, a CT structure, and a second CQ structure, and the partition is provided with at least one window corresponding to the first CQ structure, the CT structure, and the second CQ structure, respectively.

8. The filter according to claim 7, characterized in that When multiple resonators in the first CQ structure or the CT structure or the second CQ structure are coupled via the same window, the coupling strength between the multiple resonators is adjusted by adjusting the position of the central axis of the window.

9. The filter according to claim 5, characterized in that A first coupling adjustment structure is formed between the two resonators, and the first coupling adjustment structure is arranged on one side of the window.

10. The filter according to claim 5, characterized in that A second coupling adjustment structure is formed between the two resonators, and the second coupling adjustment structure includes a notch opened on the window.

11. The filter according to claim 5, characterized in that A third coupling adjustment structure is formed between the two resonators, and the third coupling adjustment structure is arranged on the corresponding windows of the two resonators.

12. The filter according to claim 1, characterized in that A coupling connecting plate is provided between two adjacent and inductively coupled resonators located on the same side of the partition, and the coupling connecting plate connects the two resonators.

13. The filter according to claim 1, characterized in that: The shell, the partition and the resonator are integrally formed.

14. The filter according to claim 2, characterized in that The resonator comprises an extension arm and a resonant ring, one end of the extension arm forms the grounding portion, and the other end is connected to the resonant ring.

15. The filter according to any one of claims 1 to 14, characterized in that: The multiple resonant cavities sequentially constitute a first CQ structure, a CT structure, and a second CQ structure, and the first CQ structure and the second CQ structure are electrically connected via the CT structure.

16. The filter according to claim 15, characterized in that The partition separates the shell to form two cavities, the first CQ structure includes four resonant cavities, and the four resonant cavities are evenly divided in the two cavities; the CT structure includes three resonant cavities, one of the three resonant cavities is arranged in one of the cavities, and the other two resonant cavities are arranged in the other cavity; the second CQ structure includes four resonant cavities, and the four resonant cavities are evenly divided in the two cavities.

17. The filter according to claim 16, characterized in that In the first CQ structure and / or the second CQ structure, two resonators arranged in the same cavity are inductively coupled or capacitively coupled, and two resonators arranged in different cavities are inductively coupled.

18. The filter according to claim 16, characterized in that In the CT structure, two resonators arranged in the same cavity are inductively coupled or capacitively coupled, and two resonators arranged in different cavities are inductively coupled or uncoupled.

19. The filter according to claim 18, characterized in that One of the resonators of the CT structure is coupled with a resonator of the first CQ structure or two resonators arranged in different cavities; another resonator of the CT structure is shared by the second CQ structure, and the other resonator is coupled with the other two resonators of the CT structure.

20. A communication device, characterized in that: Comprising a filter as claimed in any one of claims 1 to 19.

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