Resonant filter
By designing a metal resonant plate without bending and distributing it in the same plane, the problems of miniaturization and processing difficulty of existing resonant filters are solved, and the flat design and efficient processing of resonant filters are realized.
Patent Information
- Application Number
- CN202420408820.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-04
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-03-04
AI Technical Summary
The existing resonant filters are not conducive to miniaturization design due to the multi-row arrangement of resonant parts, and the resonant parts including bending parts have problems such as high processing difficulty and low dimensional accuracy.
A resonant filter is designed that includes a plurality of metal resonant plates that do not need to bend, are essentially located in the same plane and are distributed in an opposite direction, forming a signal connection by coupling between two adjacent metal resonant plates.
The flat design of the resonant filter is realized, which is conducive to the development of miniaturization, simplifies the processing process, and avoids the problems of high processing difficulty and low dimensional accuracy.
Smart Images
Figure CN222654318U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of filters, and in particular to a resonant filter. Background Art
[0002] A filter is a frequency selective device used to filter out useless frequency band signals (i.e., attenuate signals outside the passband) and retain signals in the useful frequency band (i.e., allow signals within the passband to pass).
[0003] The existing resonant filter mainly includes a shell with a cavity and an opening, a cover plate covering the opening, and a resonant component arranged in the cavity. The resonant components are generally arranged in multiple rows and include bent components, multiple metal resonant sheets, and combinations thereof. Among them, the resonant components arranged in multiple rows occupy a large space in the cavity, which is not conducive to the miniaturization design of the resonant filter; the resonant components including bent components have the problems of high processing difficulty and low dimensional accuracy.
[0004] Therefore, there is an urgent need to provide a resonant filter to solve the above problems. Utility Model Content
[0005] The embodiment of the present application provides a resonant filter, which can solve the problem that the existing resonant filter is not conducive to the miniaturization design of the resonant filter due to the multi-row arrangement of the resonant components, and the problem that the existing resonant filter has great processing difficulty and low dimensional accuracy due to the resonant components including bent parts.
[0006] In order to solve the above technical problems, this application is implemented as follows:
[0007] The present application provides a resonant filter, which includes: a shell, a plurality of metal resonant plates, an input port and an output port, wherein the shell has a housing cavity and a first inner surface and a second inner surface arranged opposite to each other, and is provided with a first through hole and a second through hole communicating with the housing cavity; the plurality of metal resonant plates are located in the housing cavity and are arranged on the first inner surface and the second inner surface, the plurality of metal resonant plates are substantially located in the same plane and are distributed opposite to each other, and coupling is generated between the plurality of metal resonant plates to form a signal connection; the input port is engaged with the first through hole and is connected to one of the plurality of metal resonant plates; the output port is engaged with the second through hole and is connected to another of the plurality of metal resonant plates.
[0008] In the resonant filter of the embodiment of the present application, the multiple metal resonant plates do not need to be bent, which has the advantage of simple processing; the multiple metal resonant plates are substantially located in the same plane and are distributed in opposite directions, realizing a flat design of the resonant filter (that is, the length of the resonant filter in a direction perpendicular to the arrangement direction of the multiple metal resonant plates is significantly reduced), which is conducive to the miniaturization of the resonant filter; coupling is generated between two adjacent metal resonant plates to form a signal connection, and there is no need to design a bending part, so there is no problem of high processing difficulty and low dimensional accuracy. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are configured to explain the present application and do not constitute an improper limitation on the present application. In the drawings:
[0010] Figure 1 is a three-dimensional diagram of an embodiment of a resonant filter according to the present application;
[0011] Figure 2 for Figure 1 An exploded schematic diagram of an embodiment of a resonant filter;
[0012] Figure 3 for Figure 2 A cross-sectional schematic diagram of a resonant filter;
[0013] Figure 4 is a three-dimensional diagram of another embodiment of a resonant filter according to the present application;
[0014] Figure 5 for Figure 4 An exploded schematic diagram of an embodiment of a resonant filter;
[0015] Figure 6 for Figure 5 A cross-sectional schematic diagram of a resonant filter;
[0016] Figure 7 for Figure 1 An exploded schematic diagram of another embodiment of a resonant filter;
[0017] Figure 8 for Figure 7 A cross-sectional schematic diagram of a resonant filter;
[0018] Fig. 9 for Figure 3 The resonant filter and Figure 8 The passband insertion loss curve of the resonant filter;
[0019] Fig.10 A three-dimensional diagram of another embodiment of a resonant filter according to the present application;
[0020] Fig.11 for Fig.10 An exploded schematic diagram of an embodiment of a resonant filter;
[0021] Fig.12 for Fig.11 A cross-sectional schematic diagram of a resonant filter;
[0022] Fig.13 for Fig.10An exploded schematic diagram of another embodiment of a resonant filter; and
[0023] Fig.14 for Fig.13 Schematic cross-section of a resonant filter. DETAILED DESCRIPTION
[0024] The following will be used in conjunction with the accompanying drawings to illustrate the embodiments of the present utility model. In these drawings, the same reference numerals represent the same or similar components or method flows.
[0025] It must be understood that the words "comprise", "include", etc. used in this specification are configured to indicate the existence of specific technical features, values, method steps, job processing and / or components, but do not exclude the addition of more technical features, values, method steps, job processing, components, or any combination of the above.
[0026] It should be understood that when a component is described as being "connected" or "coupled" to another component, it may be directly connected or coupled to the other component, and intermediate components may be present. Conversely, when a component is described as being "directly connected" or "directly coupled" to another component, there are no intermediate components.
[0027] In addition, although the terms “first”, “second”, etc. are used herein to describe different elements, such terms are merely used to distinguish elements or operations described with the same technical terms.
[0028] See also Figures 1 to 3 , Figure 1 is a three-dimensional diagram of an embodiment of a resonant filter according to the present application, Figure 2 for Figure 1 An exploded schematic diagram of an embodiment of a resonant filter, Figure 3 for Figure 2 The cross-sectional diagram of the resonant filter. Figures 1 to 3As shown, the resonant filter 100 is applicable to a frequency band above 5.5 GHz, and comprises: a housing 110, a plurality of metal resonant plates 120, an input port 130 and an output port 140. The housing 110 has a receiving cavity 111 and a first inner surface 112 and a second inner surface 113 disposed opposite to each other, and is provided with a first through hole 114 and a second through hole 115 communicating with the receiving cavity 111. The plurality of metal resonant plates 120 are located in the receiving cavity 111 and are disposed on the first inner surface 112 and the second inner surface 113 (i.e., the plurality of metal resonant plates 120 are distributed in two rows). The plurality of metal resonant plates 120 are substantially located in the same plane and are distributed opposite to each other. The plurality of metal resonant plates 120 are coupled to each other to form a signal connection. The input port 130 is coupled to the first through hole 114 and is connected to one of the plurality of metal resonant plates 120. The output port 140 is coupled to the second through hole 115 and is connected to another of the plurality of metal resonant plates 120.
[0029] Each of the plurality of metal resonant sheets 120 may be, but not limited to, a sheet material with a metal surface or a metal sheet. Therefore, the plurality of metal resonant sheets 120 do not need to be bent, and have the advantage of simple processing. Since the plurality of metal resonant sheets 120 are substantially located in the same plane and are distributed opposite to each other, a flat design of the resonant filter 100 is achieved (i.e., the length of the resonant filter 100 along the first direction F is significantly reduced, and the first direction F is perpendicular to the arrangement direction C of the plurality of metal resonant sheets 120), which is conducive to the miniaturization of the resonant filter 100. In addition, coupling is generated between two adjacent metal resonant sheets 120 to form a signal connection, and the design of a bending part is not required, so there is no problem of high processing difficulty and low dimensional accuracy. In addition, the thickness of the metal resonant sheet 120 may be, but not limited to, 0.5 millimeters (mm) to 3 mm. The thickness of each of the plurality of metal resonant sheets 120 is usually consistent. If not consistent, the difference in thickness may be, but not limited to, less than 50%; the thickness of the metal resonant sheet 120 is related to the size and index requirements of the resonant filter 100. Furthermore, the shape of the metal resonant plate 120 can be designed according to its frequency and the coupling requirements with the adjacent metal resonant plates 120, while ensuring that the size is as small as possible. In addition, the plurality of metal resonant plates 120 can be fixed on the first inner surface 112 or the second inner surface 113 by laser welding, solder paste welding or brazing.
[0030] In one embodiment, the material of the plurality of metal resonant plates 120 may be, but not limited to, iron or iron alloy, and the processing method may be, but not limited to, laser cutting, wire cutting, and sheet metal stamping.
[0031] In one embodiment, a plurality of metal resonant plates 120 may be alternately arranged on the first inner surface 112 and the second inner surface 113 .
[0032] In one embodiment, each of the plurality of metal resonant plates 120 may include a vertical section 121, an extension section 123 extending from one end of the vertical section 121, and a coupling section 125 extending from one end of the extension section 123 away from the vertical section 121, one end of the vertical section 121 away from the extension section 123 is fixed on the first inner surface 112 or the second inner surface 113, and the coupling section 125 of each of the plurality of metal resonant plates 120 is close to the coupling section 125 of the adjacent metal resonant plate 120. The two adjacent metal resonant plates 120 may be two metal resonant plates 120 arranged opposite to each other or two metal resonant plates 120 arranged along the arrangement direction C.
[0033] In one embodiment, the plurality of metal resonant plates 120 are not physically connected. In one example, the plurality of metal resonant plates 120 fixed on the first inner surface 112 are arranged at intervals, and the plurality of metal resonant plates 120 fixed on the second inner surface 113 are arranged at intervals; the spacing between two adjacent metal resonant plates 120 fixed on the first inner surface 112 and the second inner surface 113 is related to the size and index requirements of the resonant filter 100.
[0034] In one embodiment, the housing 110 is further provided with a plurality of partition ribs 116, and the plurality of partition ribs 116 divide the accommodating cavity 111 into a plurality of resonant cavities 117 distributed in two rows, and a plurality of metal resonant plates 120 are disposed in the plurality of resonant cavities 117, and two adjacent resonant cavities 117 are connected. Specifically, the adjacent upper and lower rows of resonant cavities 117 are connected, and the plurality of metal resonant plates 120 are disposed in the plurality of resonant cavities 117, so that coupling can be generated between the two metal resonant plates 120 disposed in opposite directions to form a signal connection. Among them, one resonant cavity 117 can be provided with one or more metal resonant plates 120, and the number and corresponding setting relationship of the resonant cavities 117 and the metal resonant plates 120 can be designed according to actual needs.
[0035] In one embodiment, the housing 110 may include a bottom plate 118, a shell 119 and a cover plate 127, the shell 119 has a first opening 1191 and a second opening 1192 that are arranged opposite to each other, the bottom plate 118 is arranged at the first opening 1191, the cover plate 127 is arranged at the second opening 1192, the bottom plate 118, the shell 119 and the cover plate 127 surround and form a receiving cavity 111, the bottom plate 118 has a first inner surface 112, and the cover plate 127 has a second inner surface 113. The materials of the bottom plate 118, the shell 119 and the cover plate 127 may be, but not limited to, aluminum or aluminum alloy, and the processing method of the shell 119 may be, but not limited to, CNC machine tools (Computer numerical control, CNC), die casting, or extrusion molding.
[0036] In one embodiment, the first through hole 114 and the second through hole 115 are arranged on the bottom plate 118 or the cover plate 127, the input port 130 includes a first support seat 132, the metal resonance plate 120 connected to the input port 130 passes through the first support seat 132 through the first tap plate 120a and then extends out of the housing 110, and the first tap plate 120a and the metal resonance plate 120 connected to the input port 130 are formed as one piece; the output port 140 includes a second support seat 142, the metal resonance plate 120 connected to the output port 140 passes through the second support seat 142 through the second tap plate 120b and then extends out of the housing 110, and the second tap plate 120b and the metal resonance plate 120 connected to the output port 140 are formed as one piece. Among them, the material of the first support seat 132 and the second support seat 142 can be but not limited to engineering plastics, for example: polytetrafluoroethylene (PTFE), perfluoropropyl vinyl ether (PFA), polyphenylene sulfide (PPS); the processing method of the first support seat 132 and the second support seat 142 can be but not limited to CNC, injection molding, powder sintering; the first support seat 132 and the second support seat 142 can be connected to the first through hole 114 and the second through hole 115 by an adhesive; the first tap piece 120a is used to feed the signal into the resonant filter 100; the second tap piece 120b is used to feed the signal out of the resonant filter 100; the number of the first tap piece 120a and the second tap piece 120b is related to the number of channels of the resonant filter 100. In this embodiment, the resonant filter 100 is a single-channel filter, so the number of the first tap piece 120a and the second tap piece 120b is one each.
[0037] See also Figures 4 to 6 , Figure 4 is a three-dimensional diagram of another embodiment of a resonant filter according to the present application, Figure 5 for Figure 4 An exploded schematic diagram of an embodiment of a resonant filter, Figure 6 for Figure 5 The cross-sectional diagram of the resonant filter. Figures 4 to 6 As shown, it can be seen Figures 4 to 6 Examples and Figures 1 to 3 The difference between the embodiments of the present invention lies in the arrangement positions of the first through hole 114 and the second through hole 115 and the design of the input port 130 and the output port 140. Figures 4 to 6In the embodiment, the first through hole 114 and the second through hole 115 may be arranged on the same side wall of the shell 119, and the same side wall may be the side wall 1193 of the shell 119 parallel to the arrangement direction C of the metal resonance plate 120; the input port 130 may include a first port conductor 134 and a first base 136, one end of the first port conductor 134 is connected to a metal resonance plate 120, the first base 136 engages the first through hole 114, and the other end of the first port conductor 134 passes through the first base 136 and then extends out of the shell 110; the output port 140 may include a second port conductor 144 and a second base 146, one end of the second port conductor 144 is connected to another metal resonance plate 120, the second base 146 engages the second through hole 115, and the other end of the second port conductor 144 passes through the second base 146 and then extends out of the shell 110. Among them, the material of the first base 136 and the second base 146 can be but not limited to engineering plastics; the processing method of the first base 136 and the second base 146 can be but not limited to CNC, injection molding, and powder sintering; the first base 136 and the second base 146 can be connected to the first through hole 114 and the second through hole 115 by an adhesive; the first port conductor 134 is used to feed the signal into the resonant filter 100; the second port conductor 144 is used to feed the signal out of the resonant filter 100; the number of the input port 130 and the output port 140 is related to the number of channels of the resonant filter 100. In this embodiment, the resonant filter 100 is a single-channel filter, so the number of the input port 130 and the output port 140 is one each.
[0038] In one embodiment, the first through hole 114 and the second through hole 115 may be disposed on different side walls of the housing 119, and the different side walls may be two corresponding side walls of the housing 119 parallel to the arrangement direction C of the metal resonant plate 120; the input port 130 may include a first port conductor 134 and a first base 136, one end of the first port conductor 134 is connected to one metal resonant plate 120, the first base 136 engages the first through hole 114, and the other end of the first port conductor 134 passes through the first base 136 and then extends out of the housing 110; the output port 140 may include a second port conductor 144 and a second base 146, one end of the second port conductor 144 is connected to another metal resonant plate 120, the second base 146 engages the second through hole 115, and the other end of the second port conductor 144 passes through the second base 146 and then extends out of the housing 110. In other words, the arrangement positions of the input port 130 and the output port 140 are more flexible and can meet different design requirements.
[0039] See also Figures 1 to 3The plurality of metal resonant plates 120 include a first resonant plate 122, a second resonant plate 124, a third resonant plate 126 and a fourth resonant plate 128 which are signal-connected in sequence. The first resonant plate 122 and the fourth resonant plate 128 are spaced apart on the second inner surface 113, the second resonant plate 124 and the third resonant plate 126 are spaced apart on the first inner surface 112, the first resonant plate 122 and the fourth resonant plate 128 are disposed in different resonant cavities 117, and the second resonant plate 124 and the third resonant plate 126 are disposed in the same resonant cavity 117. The signal transmission path is sequentially the first resonant plate 122, the second resonant plate 124, the third resonant plate 126 and the fourth resonant plate 128; each time the signal passes through a metal resonant plate 120, the phase of the signal will change by -90°; inductive coupling can be generated between the first resonant plate 122 and the second resonant plate 124, inductive coupling can be generated between the second resonant plate 124 and the third resonant plate 126, and inductive coupling can be generated between the third resonant plate 126 and the fourth resonant plate 128, and the inductive coupling is used to enhance the high-end suppression of the resonant filter 100; the coupling amount generated between the first resonant plate 122 and the third resonant plate 126 is extremely small, and the coupling amount generated between the second resonant plate 124 and the fourth resonant plate 128 is extremely small, and therefore, it has no effect on the realization of the resonant filter 100.
[0040] In one embodiment, the input port 130 and the output port 140 are connected to the first resonant plate 122 and the fourth resonant plate 128 respectively.
[0041] See also Figure 7 and Figure 8 , Figure 7 for Figure 1 An exploded schematic diagram of another embodiment of a resonant filter, Figure 8 for Figure 7 The cross-sectional diagram of the resonant filter. Figure 7 and Figure 8 As shown, it can be seen Figure 7 and Figure 8 Examples and Figures 1 to 3 The difference between the embodiments is that the first resonant plate 122 and the fourth resonant plate 128 are disposed in different resonant cavities 117 that are interconnected, and capacitive cross coupling can be generated between the first resonant plate 122 and the fourth resonant plate 128.
[0042] See also Figure 3 , Figure 8 and Fig. 9 , Fig. 9 for Figure 3 The resonant filter and Figure 8 The passband insertion loss curve of the resonant filter; Fig. 9In the figure, the horizontal axis is the frequency, in megahertz (MHz); the vertical axis is the insertion loss, in decibels (dB); the solid line is the resonant filter 100 (i.e., when the first resonant plate 122 and the fourth resonant plate 128 are arranged in different resonant cavities 117 that are interconnected) when Figure 8 The dotted line is the resonant filter 100 (ie, the resonant filter 100) when the first resonant plate 122 and the fourth resonant plate 128 are arranged in separate resonant cavities 117. Figure 3 The passband insertion loss curve of the resonant filter 100). Fig. 9 It can be seen that when the first resonant plate 122 and the fourth resonant plate 128 are arranged in their respective independent resonant cavities 117, the first resonant plate 122 and the fourth resonant plate 128 are blocked by the partition rib 116, and no cross-coupling occurs, so that the out-of-band signal suppression capability of the resonant filter 100 is relatively poor (slow attenuation); when the first resonant plate 122 and the fourth resonant plate 128 are arranged in different resonant cavities 117 that are interconnected, capacitive cross-coupling can be generated between the first resonant plate 122 and the fourth resonant plate 128, so that the phase of the signal changes by +90°, and symmetrical zero points are achieved on the left and right sides of the passband insertion loss curve of the resonant filter 100 (i.e., a capacitive zero point is generated on the left side of the passband to enhance the low-end suppression of the resonant filter 100; an inductive zero point is generated on the right side of the passband to enhance the high-end suppression of the resonant filter 100), thereby significantly increasing the out-of-band signal suppression capability of the resonant filter 100.
[0043] In one embodiment, when the first resonant plate 122 and the fourth resonant plate 128 are disposed in different resonant cavities 117 that are interconnected, the resonant filter 100 may further include a first connecting rib 150, wherein the first connecting rib 150 and the first resonant plate 122 are substantially located on the same plane, and the first connecting rib 150 connects the first resonant plate 122 and the fourth resonant plate 128 (such as Figure 8 The first connecting rib 150, the first resonant plate 122 and the fourth resonant plate 128 may be formed in one piece but are not limited to being formed in one piece. The first connecting rib 150 is used to strengthen the coupling amount of the capacitive cross coupling generated between the first resonant plate 122 and the fourth resonant plate 128.
[0044] In one embodiment, the resonant filter 100 may further include a second connecting rib 160, the second connecting rib 160 and the second resonant plate 124 are substantially located in the same plane, and the second connecting rib 160 connects the second resonant plate 124 and the third resonant plate 126 (such as Figure 8 The second connecting rib 160 , the second resonant plate 124 and the third resonant plate 126 may be formed in one piece but are not limited to being formed in one piece. The second connecting rib 160 is used to strengthen the electromagnetic coupling between the second resonant plate 124 and the third resonant plate 126 .
[0045] In one embodiment, when other factors remain unchanged, the smaller the distance between the end of the second resonant plate 124 away from the first inner surface 112 and the end of the third resonant plate 126 away from the first inner surface 112 (i.e., the smaller the distance between the coupling section 125 of the second resonant plate 124 and the coupling section 125 of the third resonant plate 126), the smaller the distance between the second connecting rib 160 and the first inner surface 112; the larger the distance between the end of the second resonant plate 124 away from the first inner surface 112 and the end of the third resonant plate 126 away from the first inner surface 112 (i.e., the larger the distance between the coupling section 125 of the second resonant plate 124 and the coupling section 125 of the third resonant plate 126), the larger the distance between the second connecting rib 160 and the first inner surface 112. The larger the distance between the second connecting rib 160 and the first inner surface 112, the stronger the coupling effect between the second resonant plate 124 and the third resonant plate 126.
[0046] See also Figures 10 to 12 , Fig.10 FIG. 1 is a three-dimensional diagram of another embodiment of a resonant filter according to the present application. Fig.11 for Fig.10 An exploded schematic diagram of an embodiment of a resonant filter, Fig.12 for Fig.11 The cross-sectional diagram of the resonant filter. Figures 10 to 12 As shown, it can be known that the first resonant plate 122, the second resonant plate 124, the third resonant plate 126 and the fourth resonant plate 128 can constitute a group of resonant plates 129, and the plurality of metal resonant plates 120 can include N groups of resonant plates 129 and N-1 intermediate resonant plates 170, an intermediate resonant plate 170 is arranged between two adjacent groups of resonant plates 129, N is an integer greater than or equal to 2, and each of the N-1 intermediate resonant plates 170 is arranged on the first inner surface 112 or the second inner surface 113 and is coupled with the fourth resonant plate 128 and the first resonant plate 122 adjacent to the two sides (that is, the fourth resonant plate 128 of the previous group of resonant plates 129 and the first resonant plate 122 of the next group of resonant plates 129, the previous group of resonant plates 129 and the next group of resonant plates 129 are defined by the front and back order of signal transmission) to form a signal connection. In this embodiment, N may be, but is not limited to, 2. Therefore, the resonant filter 100 includes two groups of resonant plates 129 and an intermediate resonant plate 170. The intermediate resonant plate 170 may be disposed on the first inner surface 112. The resonant filter 100 may generate two capacitive zero points and two inductive zero points due to the two groups of resonant plates 129. It should be noted that the intermediate resonant plate 170 will not couple with the third resonant plate 126 of the previous group of resonant plates 129 and the second resonant plate 124 of the next group of resonant plates 129. Therefore, the intermediate resonant plate 170 may be disposed on the first inner surface 112 or the second inner surface 113.
[0047] In one embodiment, the input port 130 and the output port 140 are connected to the first resonant plate 122 of the first group of resonant plates 129 and the fourth resonant plate 128 of the Nth group of resonant plates 129, respectively. Fig.12 The input port 130 and the output port 140 are respectively connected to the first group of resonant plates 129 (i.e. Fig.12 The first resonant plate 122 of the leftmost group of resonant plates 129 in the figure and the second group of resonant plates 129 (i.e. Fig.12 Therefore, the signal transmission path is sequentially the first resonant plate 122, the second resonant plate 124, the third resonant plate 126 and the fourth resonant plate 128 of the first resonant plate 129, the middle resonant plate 170, and the first resonant plate 122, the second resonant plate 124, the third resonant plate 126 and the fourth resonant plate 128 of the second resonant plate 129.
[0048] In one embodiment, the middle resonant plate 170 disposed on the second inner surface 113 and the fourth resonant plate 128 and the first resonant plate 122 adjacent to the middle resonant plate 170 on both sides thereof are disposed in the same resonant cavity 117 .
[0049] See also Fig.10 , Fig.13 and Fig.14 , Fig.13 for Fig.10 An exploded schematic diagram of another embodiment of a resonant filter, Fig.14 for Fig.13 The cross-sectional diagram of the resonant filter. Fig.13 and Fig.14 As shown, it can be seen Fig.13 and Fig.14 Examples and Fig.11 and Fig.12 The difference between the embodiments is that Fig.13 and Fig.14 The middle resonant plate 170 is disposed on the first inner surface 112, and the middle resonant plate 170 disposed on the first inner surface 112 and the adjacent second resonant plate 124 and third resonant plate 126 (i.e., the third resonant plate 126 of the previous group of resonant plates 129 and the second resonant plate 124 of the next group of resonant plates 129) are disposed in different resonant cavities 117.
[0050] In summary, in the resonant filter of the embodiment of the present application, multiple metal resonant plates do not need to be bent, which has the advantage of simple processing; multiple metal resonant plates are substantially located in the same plane and are distributed oppositely, and the length of the resonant filter in a direction perpendicular to the arrangement direction of the multiple metal resonant plates is significantly reduced, which is conducive to the miniaturization of the resonant filter; coupling is generated between two adjacent metal resonant plates to form a signal connection, and there is no need to design a bending part, so there is no problem of high processing difficulty and low dimensional accuracy. In addition, the resonant filter of the embodiment of the present application can be a single-layer stacked, drawer-type design with a compact structure. This architecture provides convenience for the subsequent expansion of the multiplexer. In addition, the resonant filter of the embodiment of the present application is suitable for frequency bands above 5.5 GHz. Furthermore, the setting positions of the input port and output port of the resonant filter of the embodiment of the present application are more flexible to meet different design requirements.
[0051] Although the present invention is described using the above embodiments, it should be noted that these descriptions are not configured to limit the present invention. On the contrary, the present invention covers obvious modifications and similar arrangements that are obvious to those skilled in the art. Therefore, the scope of the claims should be interpreted in the broadest way to include all obvious modifications and similar arrangements.
Claims
1. A resonant filter, characterized in that: include: The housing has a housing cavity and a first inner surface and a second inner surface that are oppositely disposed, and is provided with a first through hole and a second through hole that are communicated with the housing cavity; A plurality of metal resonant plates, located in the accommodating cavity and disposed on the first inner surface and the second inner surface, the plurality of metal resonant plates are substantially located in the same plane and are distributed opposite to each other, and coupling is generated between the plurality of metal resonant plates to form a signal connection; an input port engaging the first through hole and connected to one of the plurality of metal resonant plates; as well as The output port is engaged with the second through hole and connected to another metal resonance plate among the plurality of metal resonance plates.
2. The resonant filter according to claim 1, wherein: The shell is further provided with a plurality of partition ribs, which divide the accommodating cavity into a plurality of resonant cavities distributed in two rows. The plurality of metal resonant plates are arranged in the plurality of resonant cavities, and two adjacent and opposite resonant cavities are connected.
3. The resonant filter according to claim 2, wherein: The multiple metal resonant plates include a first resonant plate, a second resonant plate, a third resonant plate and a fourth resonant plate which are sequentially signal-connected, the first resonant plate and the fourth resonant plate are spaced apart on the second inner surface, the second resonant plate and the third resonant plate are spaced apart on the first inner surface, the first resonant plate and the fourth resonant plate are disposed in different resonant cavities, and the second resonant plate and the third resonant plate are disposed in the same resonant cavity.
4. The resonant filter according to claim 3, wherein: The input port and the output port are connected to the first resonant plate and the fourth resonant plate respectively.
5. The resonant filter according to claim 3, characterized in that The different resonant cavities are connected, and capacitive cross coupling is generated between the first resonant plate and the fourth resonant plate.
6. The resonant filter according to claim 5, characterized in that It also includes a first connecting rib, wherein the first connecting rib and the first resonant plate are substantially located in the same plane, and the first connecting rib connects the first resonant plate and the fourth resonant plate.
7. The resonant filter according to claim 3, characterized in that It also includes a second connecting rib, wherein the second connecting rib and the second resonant plate are substantially located in the same plane, and the second connecting rib connects the second resonant plate and the third resonant plate.
8. The resonant filter according to claim 7, wherein: The smaller the distance between one end of the second resonant plate away from the first inner surface and one end of the third resonant plate away from the first inner surface, the smaller the distance between the second connecting rib and the first inner surface; the larger the distance between one end of the second resonant plate away from the first inner surface and one end of the third resonant plate away from the first inner surface, the larger the distance between the second connecting rib and the first inner surface.
9. The resonant filter according to claim 3, characterized in that The first resonant plate, the second resonant plate, the third resonant plate and the fourth resonant plate constitute a group of resonant plates, the multiple metal resonant plates include N groups of resonant plates and N-1 intermediate resonant plates, an intermediate resonant plate is arranged between two adjacent groups of resonant plates, N is an integer greater than or equal to 2, and each of the N-1 intermediate resonant plates is arranged on the first inner surface or the second inner surface and is coupled with the fourth resonant plate and the first resonant plate adjacent to both sides to form a signal connection.
10. The resonant filter according to claim 9, characterized in that The input port and the output port are respectively connected to the first resonant plate of the first group of resonant plates and the fourth resonant plate of the Nth group of resonant plates.
11. The resonant filter according to claim 9, wherein The middle resonance plate arranged on the second inner surface and the fourth resonance plates and the first resonance plates adjacent to the middle resonance plate on both sides thereof are arranged in the same resonance cavity.
12. The resonant filter according to claim 9, wherein: The middle resonance plate arranged on the first inner surface and the adjacent second resonance plate and the third resonance plate are arranged in different resonance cavities.
13. The resonant filter according to claim 1, wherein: The shell includes a base plate, a shell and a cover plate, the shell has a first opening and a second opening arranged opposite to each other, the base plate is arranged at the first opening, the cover plate is arranged at the second opening, the base plate, the shell and the cover plate surround and form the accommodating cavity, the base plate has the first inner surface, and the cover plate has the second inner surface.
14. The resonant filter according to claim 13, wherein: The first through hole and the second through hole are arranged on the bottom plate or the cover plate.
15. The resonant filter according to claim 14, wherein: The input port includes a first support seat, and the metal resonance plate connected to the input port passes through the first support seat through a first tap plate and then extends out of the housing, and the first tap plate and the metal resonance plate connected to the input port are formed as one piece; the output port includes a second support seat, and the other metal resonance plate connected to the output port passes through the second support seat through a second tap plate and then extends out of the housing, and the second tap plate and the other metal resonance plate connected to the output port are formed as one piece.
16. The resonant filter according to claim 13, wherein: The first through hole and the second through hole are arranged on the same side wall or different side walls of the housing.
17. The resonant filter according to claim 16, wherein: The input port comprises a first port conductor and a first base, one end of the first port conductor is connected to the one metal resonance plate, the first base engages the first through hole, and the other end of the first port conductor passes through the first base and then extends out of the housing; the output port comprises a second port conductor and a second base, one end of the second port conductor is connected to the other metal resonance plate, the second base engages the second through hole, and the other end of the second port conductor passes through the second base and then extends out of the housing.
18. The resonant filter according to claim 1, wherein: Each of the multiple metal resonant plates includes a vertical section, an extension section extending from one end of the vertical section, and a coupling section extending from one end of the extension section away from the vertical section, one end of the vertical section away from the extension section is fixed on the first inner surface or the second inner surface, and the coupling section of each of the multiple metal resonant plates is close to the coupling section of the adjacent metal resonant plate.
19. The resonant filter according to claim 1, wherein: Each of the plurality of metal resonance plates is a sheet material having a metal surface or is a metal sheet.
20. The resonant filter according to claim 1, wherein The plurality of metal resonance plates are not physically connected to each other.