A cavity filter coupler

Abstract

The application provides a cavity filter coupler, and relates to the technical field of communication equipment.The cavity filter coupler comprises a cylindrical waveguide base body, the inside of the cylindrical waveguide base body has a cavity, and a plurality of through holes that are in communication with the cavity are formed in the peripheral wall of the cylindrical waveguide base body; a resonant piece is connected with the cylindrical waveguide base body and is located in the cavity; and at least two feeders are arranged at one end of the cylindrical waveguide base body in the axial direction and at the other end of the cylindrical waveguide base body in the axial direction.The cavity filter coupler provided by the application solves the problems of single function, poor use performance and difficulty in miniaturization design of a filter or a coupler in the prior art.

Description

Technical Field

[0001] This application relates to the field of communication equipment technology, and in particular to a cavity filter coupler. Background Technology

[0002] In communication equipment, the radio frequency front-end system is the core signal conversion and transmission hub connecting the baseband signal processing unit and the antenna.

[0003] In related technologies, the radio frequency front-end system includes a filtering and coupling device, which includes independently configured filters and couplers to jointly meet the filtering and coupling requirements of the radio frequency front-end system.

[0004] However, in the above-mentioned filtering coupling device, the filter and coupler are both designed independently, which is not conducive to the miniaturization design of the overall filtering coupling device. Summary of the Invention

[0005] This application provides a cavity filter coupler to solve the problems of single filters or couplers in related technologies having limited functions, poor performance, and being unfavorable for miniaturization design of filter coupling devices.

[0006] This application provides a cavity filter coupler, comprising:

[0007] A cylindrical waveguide substrate, wherein the cylindrical waveguide substrate has a cavity inside, and a plurality of through holes communicating with the cavity are formed on the peripheral wall of the cylindrical waveguide substrate;

[0008] The resonator is connected to the cylindrical waveguide substrate and is located within the cavity.

[0009] At least two feed elements, at least one of the feed elements is disposed at one axial end of the cylindrical waveguide substrate, and at least one of the feed elements is disposed at the other axial end of the cylindrical waveguide substrate.

[0010] In one possible implementation, the resonator includes:

[0011] An annular segment is connected to the cylindrical waveguide substrate and is coaxially located inside the cavity.

[0012] At least two strip segments are located inside the annular segment, and both ends of the strip segments are connected to the annular segment, with the strip segments distributed intersectingly.

[0013] In one possible implementation, two strip segments are provided, and the two strip segments extend in perpendicular directions.

[0014] In one possible implementation, at least two of the vias are evenly spaced along the circumference of the cylindrical waveguide substrate, forming a via group;

[0015] At least two sets of through holes are provided, and the at least two sets of through holes are distributed at intervals along the axial direction of the cylindrical waveguide substrate.

[0016] In one possible implementation, the through hole is a rectangular hole.

[0017] In one possible implementation, the length of the through hole is 2.5mm-3.5mm, and the width of the through hole is 1mm-2mm.

[0018] In one possible implementation, the spacing between two adjacent through-hole groups is 9.5mm-11.5mm;

[0019] And / or, the distance between the via groups located at both ends of the via group distribution direction and the corresponding end of the cylindrical waveguide substrate is 4.25mm-6.25mm.

[0020] In one possible implementation, at least eight feed elements are provided, at least four of the feed elements are provided at one end of the cylindrical waveguide substrate in the axial direction, and at least four feed elements are provided at the other end of the cylindrical waveguide substrate in the axial direction.

[0021] The feed elements located at the same end of the cylindrical waveguide substrate are symmetrically arranged, and the projections of the feed elements at both ends of the cylindrical waveguide substrate on the axial direction of the cylindrical waveguide substrate are staggered.

[0022] In one possible implementation, the power supply element is an SMA connector power supply probe.

[0023] In one possible implementation, the cylindrical waveguide substrate includes a photopolymer resin waveguide substrate and a conductive metal layer disposed on the surface of the photopolymer resin waveguide substrate.

[0024] This application provides a cavity filter coupler, comprising: a cylindrical waveguide substrate having a cavity inside, and multiple through holes communicating with the cavity being formed on the peripheral wall of the cylindrical waveguide substrate; a resonator connected to the cylindrical waveguide substrate and located inside the cavity; and at least two feeders, at least one feeder being disposed at one axial end of the cylindrical waveguide substrate and at least one feeder being disposed at the other axial end of the cylindrical waveguide substrate. Therefore, during operation, the signal is input through the feed element at one end of the cylindrical waveguide substrate along the axial direction, and output through the feed element at the other end of the cylindrical waveguide substrate along the axial direction. Then, multimode resonance is excited through the cylindrical waveguide substrate and the resonators inside it, achieving the filtering function. Simultaneously, multiple through-holes enhance the electromagnetic coupling between the cylindrical waveguide substrate and the external environment, optimizing bandwidth and common-mode rejection performance. Thus, by utilizing multiple resonant modes within the cylindrical waveguide substrate, filtering, coupling, and balancing functions are integrated, resulting in advantages such as small size, superior performance, and strong common-mode rejection capability. This solves the problems of single filters or couplers in related technologies having limited functionality, poor performance, and hindering the miniaturization design of filtering and coupling devices. Attached Figure Description

[0025] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0026] Figure 1 This is a schematic diagram of the structure of a cavity filter coupler provided in an embodiment of this application;

[0027] Figure 2 for Figure 1 Schematic diagram of the structure of the resonant element;

[0028] Figure 3 for Figure 1 A schematic diagram of the through-hole configuration on a cylindrical waveguide substrate;

[0029] Figure 4 for Figure 1 A schematic diagram of the distribution of the feed components at one end of the axial direction of the cylindrical waveguide substrate;

[0030] Figure 5 for Figure 1 A schematic diagram of the distribution of the feed components at the other end of the axial direction of the cylindrical waveguide substrate;

[0031] Figure 6 S-parameter simulation and testing of a cavity filter coupler provided in this application embodiment Figure 1 ;

[0032] Figure 7 S-parameter simulation and testing of a cavity filter coupler provided in this application embodiment Figure 2;

[0033] Figure 8 Simulation and test diagrams of isolation and matching S-parameters of a cavity filter coupler provided in this application embodiment;

[0034] Figure 9 Phase simulation results of a cavity filter coupler provided in the embodiments of this application.

[0035] Explanation of reference numerals in the attached figures:

[0036] 100-Cylindrical waveguide substrate;

[0037] 200 - Resonator; 210 - Ring segment; 220 - Strip segment;

[0038] 300 - Through hole group; 310 - Through hole;

[0039] 400 - Power supply component; 401 - First power supply component; 402 - Second power supply component; 403 - Third power supply component; 404 - Fourth power supply component; 405 - Fifth power supply component; 406 - Sixth power supply component; 407 - Seventh power supply component; 408 - Eighth power supply component.

[0040] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0041] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0042] In related technologies, in communication equipment, the radio frequency front-end system is the core signal conversion and transmission hub connecting the "baseband signal processing unit" and the "antenna".

[0043] The radio frequency front-end system includes a filtering and coupling device, which consists of independently configured filters and couplers, and the filters and couplers are arranged in a cascaded manner to meet basic filtering and coupling requirements.

[0044] However, in the aforementioned filtering and coupling devices, both the filter and the coupler are independently designed, which hinders the overall miniaturization of the filtering and coupling device. Furthermore, individual filters or couplers often suffer from limited functionality and poor performance. In other words, it is difficult to simultaneously meet the requirements of high performance, miniaturization, and multifunctional integration in a single device. Especially in high-frequency applications, these filtering and coupling devices often suffer from high insertion loss and poor common-mode rejection.

[0045] Therefore, this application provides a cavity filter coupler, including: a cylindrical waveguide substrate, the cylindrical waveguide substrate having a cavity inside, and a plurality of through holes communicating with the cavity being formed on the peripheral wall of the cylindrical waveguide substrate; a resonator connected to the cylindrical waveguide substrate and located inside the cavity; and at least two feeders, at least one feeder being disposed at one axial end of the cylindrical waveguide substrate and at least one feeder being disposed at the other axial end of the cylindrical waveguide substrate. Therefore, during operation, the signal is input through the feed element at one end of the cylindrical waveguide substrate along the axial direction, and output through the feed element at the other end of the cylindrical waveguide substrate along the axial direction. Then, multimode resonance is excited through the cylindrical waveguide substrate and the resonators inside it, achieving the filtering function. Simultaneously, multiple through-holes enhance the electromagnetic coupling between the cylindrical waveguide substrate and the external environment, optimizing bandwidth and common-mode rejection performance. Thus, by utilizing multiple resonant modes within the cylindrical waveguide substrate, filtering, coupling, and balancing functions are integrated, resulting in advantages such as small size, superior performance, and strong common-mode rejection capability. This solves the problems of single filters or couplers in related technologies having limited functionality, poor performance, and hindering the miniaturization design of filtering and coupling devices.

[0046] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0047] like Figure 1 As shown in the embodiment of this application, a cavity filter coupler includes:

[0048] The cylindrical waveguide substrate 100 has a cavity inside, and multiple through holes 310 connecting the cavity are opened on the peripheral wall of the cylindrical waveguide substrate 100.

[0049] Resonator 200 is connected to cylindrical waveguide substrate 100 and is located within the cavity.

[0050] At least two feed elements 400, at least one feed element 400 is disposed at one end of the cylindrical waveguide substrate 100 in the axial direction, and at least one feed element 400 is disposed at the other end of the cylindrical waveguide substrate 100 in the axial direction.

[0051] It should be noted that the cylindrical waveguide substrate 100 is a cylindrical shell, and the shell is hollow inside and closed at both ends, thus forming a cavity inside the shell. Secondly, the cylindrical waveguide substrate 100 has a resonator 200 inside, which is connected to the inner peripheral wall of the cylindrical waveguide substrate 100.

[0052] In this embodiment, the cylindrical waveguide substrate 100 includes a photopolymer resin waveguide substrate and a conductive metal layer disposed on the surface of the photopolymer resin waveguide substrate. The conductive metal layer can be made of copper, silver, or other conductive metals, and can be deposited on the photopolymer resin waveguide substrate by electroplating or other methods to form the entire cylindrical waveguide substrate 100. Furthermore, the thickness of the conductive metal layer is not limited, but is preferably 10 μm.

[0053] Therefore, the cylindrical waveguide substrate 100 can be manufactured in the above manner, which is easier to achieve overall lightweighting and control costs compared to the method of using conductive metal to form the cylindrical waveguide substrate 100.

[0054] Of course, in other embodiments, the cylindrical waveguide substrate 100 may also be made of copper, silver or other conductive metals.

[0055] Multiple through holes 310 are provided on the peripheral wall of the cylindrical waveguide substrate 100, and the through holes 310 penetrate the peripheral wall of the cylindrical waveguide substrate 100 along the wall thickness direction.

[0056] Secondly, at least one feed element 400 is disposed at one axial end of the cylindrical waveguide substrate 100, and at least one feed element 400 is disposed at the other axial end of the cylindrical waveguide substrate 100. This is so that a signal is input through the feed element 400 at one axial end of the cylindrical waveguide substrate 100, and a signal is output through the feed element 400 at the other axial end of the cylindrical waveguide substrate 100.

[0057] Therefore, during operation, a signal is input through the feed element 400 at one end of the cylindrical waveguide substrate 100 along the axial direction, and a signal is output through the feed element 400 at the other end of the cylindrical waveguide substrate 100 along the axial direction. Then, a multimode resonant mode (such as TE / TM mode) is excited through the cylindrical waveguide substrate 100 and the resonator 200 disposed within it, thus achieving the filtering function. Simultaneously, multiple through-holes 310 enhance the electromagnetic coupling between the cylindrical waveguide substrate 100 and the external environment, optimizing bandwidth and common-mode rejection performance.

[0058] Therefore, by utilizing multiple resonant modes within the cylindrical waveguide substrate 100, the integration of filtering, coupling, and balancing functions is achieved. Compared to the approach of simultaneously setting up filters and couplers in related technologies, this approach has advantages such as relatively small size, superior performance, and strong common-mode rejection capability. It solves the problem that separate filters or couplers in related technologies have limited functionality and poor performance, which is detrimental to the miniaturization design of filtering and coupling devices.

[0059] In some embodiments, such as Figure 1 and Figure 2 As shown, the resonator 200 includes:

[0060] Ring segment 210 is connected to cylindrical waveguide substrate 100 and is coaxially located inside the cavity.

[0061] There are at least two strip segments 220, which are located inside the ring segment 210. Both ends of the strip segment 220 are connected to the ring segment 210, and the strip segments 220 are distributed in an intersecting manner.

[0062] In this embodiment, two strip segments 220 are provided, and the extension directions of the two strip segments 220 are perpendicular to each other.

[0063] Thus, the two segments 220 within the annular segment 210 can jointly form a cross-shaped structure, enabling multimode resonance to be excited through the cylindrical waveguide substrate 100 and the cross-shaped resonator 200. Furthermore, through multimode resonance coupling, a single device (i.e., the cavity filter coupler in this application) integrates filtering, coupling, and balancing functions. Simultaneously, it facilitates reducing the size of the cavity filter coupler, lowering insertion loss, and improving the common-mode rejection ratio.

[0064] In implementation, the annular segment 210 and the strip segment 220 can be integrally formed, or they can be connected by welding or other means. In other embodiments, the strip segment 220 can be set to other quantities, and the included angle between each strip segment 220 can be set to other sizes, such as 30 degrees, 60 degrees, etc.

[0065] In some embodiments, such as Figure 3 As shown, at least two through holes 310 are evenly spaced along the circumference of the cylindrical waveguide substrate 100, forming a through hole group 300.

[0066] At least two sets of through-hole groups 300 are provided, and the at least two sets of through-hole groups 300 are distributed at intervals along the axial direction of the cylindrical waveguide substrate 100. In this embodiment, there is an even number of through-hole groups 300, and multiple through-hole groups 300 are symmetrically distributed on both sides of the resonator 200 in the axial direction of the cylindrical waveguide substrate 100.

[0067] Specifically, two sets of through-hole groups 300 are provided, and the two sets of through-hole groups 300 are distributed at intervals along the axial direction of the cylindrical waveguide substrate 100. It should be noted that the two sets of through-hole groups 300 are respectively located on both sides of the resonator 200 in the axial direction of the cylindrical waveguide substrate 100, and are arranged symmetrically. Within the same through-hole group 300, there are eight through holes 310, and the eight through holes 310 are evenly distributed at intervals along the circumference of the cylindrical waveguide substrate 100.

[0068] Thus, by setting 16 through holes 310, the electromagnetic coupling between the cylindrical waveguide substrate 100 and the external environment is enhanced, the bandwidth matching and common-mode suppression performance are optimized, and the symmetry is better.

[0069] In some embodiments, such as Figure 3 As shown, through hole 310 is a rectangular hole.

[0070] The length of the through hole 310 is 2.5mm-3.5mm, and the width of the through hole 310 is 1mm-2mm.

[0071] The spacing between two adjacent through-hole groups 300 is 9.5mm-11.5mm;

[0072] And / or, the distance between the via groups 300 located at both ends of the distribution direction of the via group 300 and the corresponding end of the cylindrical waveguide substrate 100 is 4.25mm-6.25mm.

[0073] In this embodiment, the through hole 310 is a rectangular hole with a length of 3 mm and a width of 1.5 mm. It should be noted that the length direction of the through hole 310 is parallel to the axial direction of the cylindrical waveguide substrate 100.

[0074] The spacing W2 between two adjacent via groups 300 is 10.5 mm. The distance W1 between the via groups 300 located at both ends of the distribution direction of the via groups 300 and the corresponding ends of the cylindrical waveguide substrate 100 is 5.25 mm.

[0075] In other words, when the cylindrical waveguide substrate 100 extends vertically, the two via groups 300 are distributed vertically at intervals. At this time, the distance W1 between the upper via group 300 and the upper end of the cylindrical waveguide substrate 100 is 5.25 mm; the distance W1 between the lower via group 300 and the lower end of the cylindrical waveguide substrate 100 is also 5.25 mm.

[0076] Therefore, the distributed parameters of via 310 are further configured to further improve bandwidth expansion, common-mode rejection ratio, and port isolation during implementation.

[0077] In other embodiments, the number of through-hole groups 300 can also be set to other quantities, such as one group, three groups, etc. Other numbers of through holes 310 can be provided within the same through-hole group 300, such as two, four, six, etc. Of course, the shape of the through holes 310 can also be a circular hole, a strip hole, or other shapes; there are no limitations on this.

[0078] In some embodiments, such as Figure 1 , Figure 4 and Figure 5 As shown, at least eight feeders 400 are provided, at least four feeders 400 are provided at one end of the cylindrical waveguide substrate 100 in the axial direction, and at least four feeders 400 are provided at the other end of the cylindrical waveguide substrate 100 in the axial direction.

[0079] The feed elements 400 located at the same end of the cylindrical waveguide substrate 100 are symmetrically arranged, and the projections of the feed elements 400 at both ends of the cylindrical waveguide substrate 100 on the axial direction of the cylindrical waveguide substrate 100 are staggered.

[0080] In this embodiment, the feed element 400 is electrically connected to the cylindrical waveguide substrate 100. Eight feed elements 400 are provided, and are symmetrically distributed at one end of the cylindrical waveguide substrate 100 in the axial direction as follows: the first feed element 401, the eighth feed element 408, the second feed element 402, and the seventh feed element 407; and symmetrically distributed at the other end of the cylindrical waveguide substrate 100 in the axial direction as follows: the third feed element 403, the sixth feed element 406, the fourth feed element 404, and the fifth feed element 405.

[0081] Secondly, in the axial projection of the cylindrical waveguide substrate 100, the four feed elements 400 located at one end of the cylindrical waveguide substrate 100 and the four feed elements 400 at the other end are staggered around the axis of the cylindrical waveguide substrate 100.

[0082] In other words, in the projection of the cylindrical waveguide substrate 100 along its axial direction, the first feed element 401, the sixth feed element 406, the eighth feed element 408, the fourth feed element 404, the second feed element 402, the fifth feed element 405, the seventh feed element 407, and the third feed element 403 are distributed sequentially around the axis of the cylindrical waveguide substrate 100.

[0083] During operation, a signal can be input from a feed element 400 at one end of the cylindrical waveguide substrate 100 along the axial direction and output from a feed element 400 at the other end of the cylindrical waveguide substrate 100 along the axial direction. For example, the signal can be input through any one or both of the first feed element 401, the eighth feed element 408, the second feed element 402, and the seventh feed element 407, and then output through any one or both of the third feed element 403, the sixth feed element 406, the fourth feed element 404, and the fifth feed element 405. This excites multimode resonance through the cylindrical waveguide substrate 100 and the cross-shaped resonator 200.

[0084] In addition, the eight power supply components 400 adopt a differential symmetrical layout to achieve differential mode signal transmission and common mode noise cancellation, thereby facilitating the improvement of differential mode signal transmission efficiency and common mode noise rejection ratio.

[0085] Furthermore, each feed element 400 is a (SubMiniature version A, SMA) connector feed probe. This is to standardize the RF interface and improve versatility. In other embodiments, the feed element 400 may also be other types of probes or microstrip lines.

[0086] For example, such as Figure 6 and Figure 7 As shown, Figure 6 The differential and common-mode response results are shown when the signal is input from the first feeder 401 and the second feeder 402, and output in phase from the third feeder 403 and the fourth feeder 404, and the fifth feeder 405 and the sixth feeder 406. It can be seen that the in-band return loss is higher than 20dB, the insertion loss is about 3dB, and the in-band common-mode rejection is good.

[0087] Figure 7 The differential-mode and common-mode response results are shown when the signal is input from the seventh feeder 407 and the eighth feeder 408, and outputs in reverse phase from the third feeder 403 and the seventh feeder 407, and the fifth feeder 405 and the sixth feeder 406. It can be seen that the in-band return loss is higher than 20dB, the insertion loss is about 3dB, and the in-band common-mode rejection is good.

[0088] like Figure 8 As shown, Figure 8 Simulation and test results of the S-parameters for isolation and matching of cavity filter couplers. Figure 8 It can be seen that the port isolation is higher than 40dB, and the port matching is good.

[0089] like Figure 9 As shown, Figure 9 The phase simulation results are for the cavity filter coupler. Figure 9 It can be seen that the output port can achieve a phase difference of 0° and 180° in both in-phase and out-of-phase operating states.

[0090] In summary, the cavity filter coupler provided in this application operates by receiving a signal through a feeder 400 at one axial end of the cylindrical waveguide substrate 100 and outputting a signal through a feeder 400 at the other axial end of the cylindrical waveguide substrate 100. Furthermore, multimode resonance is excited by the cylindrical waveguide substrate 100 and the resonator 200 disposed within it, thereby achieving the filtering function. Simultaneously, multiple through-holes 310 enhance the electromagnetic coupling between the cylindrical waveguide substrate 100 and the external environment, optimizing bandwidth and common-mode rejection performance.

[0091] Furthermore, by utilizing multiple resonant modes within the cylindrical waveguide substrate 100, the integration of filtering, coupling, and balancing functions is achieved. Compared to the approach of simultaneously setting up filters and couplers in related technologies, it has advantages such as relatively small size, superior performance, and strong common-mode rejection capability. This solves the problem that individual filters or couplers in related technologies have limited functionality and poor performance, which is detrimental to the miniaturization design of filtering and coupling devices.

[0092] For example, the cavity filter coupler provided in this application embodiment can be applied to fields such as:

[0093] Satellite communication systems: This cavity filter coupler can be used for multi-band signal separation and synthesis, such as in Ka / Ku band transponders, to achieve highly selective filtering and low-loss power distribution.

[0094] 5G / 6G millimeter-wave communication: In millimeter-wave base stations (such as 28GHz, 39GHz), this cavity filter coupler is used in the feed network of phased array antennas to achieve signal distribution and interference suppression.

[0095] Millimeter-wave radar: In 77GHz vehicle-mounted radar or other radars, high-Q cylindrical waveguide cavities can provide precise filtering, while this balanced coupler supports multi-channel signal synthesis and interference suppression.

[0096] Quantum Computing and Superconducting Circuits: In superconducting quantum processors, cryogenically compatible in-cavity filter couplers are used for microwave signal routing and noise isolation.

[0097] Medical Imaging: In terahertz biodetection or cancer imaging, this cavity filter coupler is used for signal purity control.

[0098] The following application methods can also be used:

[0099] Frequency selection and frequency adjustment: The passband frequency can be adjusted in real time by adjusting the resonant structure of the cylindrical waveguide substrate 100 (such as an adjustable screw or MEMS (microelectromechanical system) device).

[0100] Signal enhancement and attenuation: In some cases, it is necessary to enhance or attenuate signals within a specific frequency range. Utilizing the directional nature of this cavity filter coupler (such as a 90° or 180° phase difference output), the signal is enhanced at one port, while interference is attenuated at the other.

[0101] Interference suppression: The symmetrical structure of this cavity filter coupler can cancel common-mode noise, and the differential port outputs a clean signal, ensuring the stability and reliability of the system.

[0102] Spectrum analysis and signal recognition: This cavity filter coupler distributes the input signal to multiple filter branches, and each branch extracts specific frequency band components.

[0103] This application provides a method for molding a cavity filter coupler, used to mold the cavity filter coupler in any of the above embodiments, comprising the following steps:

[0104] Fabricate a cylindrical waveguide substrate 100 in a cavity filter coupler, and make the interior of the cylindrical waveguide substrate 100 have a cavity;

[0105] A resonant element 200 is installed in the cavity filter coupler inside the cavity;

[0106] A through-hole 310 and a power supply component 400 are provided on the cylindrical waveguide substrate 100 for the cavity filter coupler.

[0107] It should be noted that the fabrication of the cylindrical waveguide substrate 100 includes: using stereolithography (SLA) 3D printing technology with photopolymer resin as the material to create a photopolymer resin waveguide substrate; then electroplating a 10μm thick layer of copper, silver, or other conductive metal material onto the photopolymer resin waveguide substrate; other thicknesses are also possible. It is important to note that when using other conductive metal materials, it is not necessary to readjust the structural parameters of the polymer resin waveguide substrate to meet the required operating frequency band and bandwidth requirements.

[0108] Therefore, 3D printing technology can be used to achieve integrated packaging, reduce assembly errors, lower manufacturing costs, and eliminate the need for subsequent adjustments, making it suitable for radio frequency front-end modules in modern wireless communication systems.

[0109] Finally, it should be noted that other embodiments of the invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of the invention is limited only by the appended claims.

Claims

1. A cavity filter coupler, characterized in that, include: A cylindrical waveguide substrate (100) has a cavity inside, and a plurality of through holes (310) communicating with the cavity are opened on the peripheral wall of the cylindrical waveguide substrate (100). A resonator (200) is connected to the cylindrical waveguide substrate (100) and is located within the cavity. At least eight feed elements (400), at least four of the feed elements (400) are disposed at one end of the cylindrical waveguide substrate (100) in the axial direction, and at least four of the feed elements (400) are disposed at the other end of the cylindrical waveguide substrate (100) in the axial direction; The feed elements (400) located at the same end of the cylindrical waveguide substrate (100) are symmetrically arranged, and the projections of the feed elements (400) at both ends of the cylindrical waveguide substrate (100) on the axial direction of the cylindrical waveguide substrate (100) are staggered. The resonator (200) includes: A ring segment (210) is connected to the cylindrical waveguide substrate (100), and the ring segment (210) is coaxially located inside the cavity; At least two strip segments (220) are located inside the annular segment (210), and both ends of the strip segment (220) are connected to the annular segment (210). The strip segments (220) are distributed intersectingly. At least two of the vias (310) are evenly spaced along the circumference of the cylindrical waveguide substrate (100) and form a via group (300). At least two sets of through-hole groups (300) are provided, and the at least two sets of through-hole groups (300) are distributed at intervals along the axial direction of the cylindrical waveguide substrate (100).

2. The cavity filter coupler according to claim 1, characterized in that, Two strip segments (220) are provided, and the extension directions of the two strip segments (220) are perpendicular to each other.

3. The cavity filter coupler according to claim 1, characterized in that, The number of through-hole groups (300) is even, and multiple through-hole groups (300) are symmetrically distributed on both sides of the resonator (200) on the axial direction of the cylindrical waveguide substrate (100).

4. The cavity filter coupler according to claim 1, characterized in that, The through hole (310) is a rectangular hole.

5. The cavity filter coupler according to claim 4, characterized in that, The length of the through hole (310) is 2.5mm-3.5mm, and the width of the through hole (310) is 1mm-2mm.

6. The cavity filter coupler according to claim 1, characterized in that, The spacing between two adjacent through-hole groups (300) is 9.5mm-11.5mm; And / or, the distance between the via groups (300) located at both ends of the distribution direction of the via group (300) and the corresponding end of the cylindrical waveguide substrate (100) is 4.25mm-6.25mm.

7. The cavity filter coupler according to any one of claims 1-6, characterized in that, The power supply component (400) is an SMA connector power supply probe.

8. The cavity filter coupler according to any one of claims 1-6, characterized in that, The cylindrical waveguide substrate (100) includes a photopolymer resin waveguide substrate and a conductive metal layer disposed on the surface of the photopolymer resin waveguide substrate.

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