A gap waveguide cavity filter power divider

Abstract

The embodiment of the present application provides a gap waveguide cavity filter power divider, belonging to the technical field of filter power dividers. The gap waveguide cavity filter power divider includes a device body, a first slot, at least two second slots and a cover plate. Among them, the device body is provided with an input waveguide interface and at least two output waveguide interfaces; the first slot is arranged on the device body and is connected to the input waveguide interface; at least two second slots are arranged on the device body, and the second slots are respectively and correspondingly connected to the output waveguide interfaces. The first slot is respectively connected to each second slot, and the opening directions of the first slot and the second slots are located on the same side of the device body; the cover plate is arranged on the device body and is configured to enclose a first waveguide resonance cavity with the first slot and enclose a second waveguide resonance cavity with the second slots. The gap waveguide cavity filter power divider provided by the embodiment of the present application has a simple structure, can reduce the insertion loss, and has good stopband performance.

Description

Technical Field

[0001] This application relates to communication antenna technology, and particularly to a gap waveguide cavity filter power divider. Background Art

[0002] As a new type of radio frequency front-end device that integrates filtering and signal energy distribution functions, the filter power divider is more in line with the development trend of low cost and miniaturization in modern communication due to its characteristics of integration and multi-functionality.

[0003] In related technologies, the filter power divider is implemented based on different transmission line technologies and structures, including different types of transmission methods such as microstrip lines, dielectric cavities, and substrate integrated waveguides. However, the above filter power dividers are less applied in millimeter waves and have large dielectric losses, making it difficult to meet the requirements of high power capacity and low loss. Summary of the Invention

[0004] This application provides a gap waveguide cavity filter power divider to solve the technical problem of large dielectric losses of the filter power divider in related technologies.

[0005] This application provides a gap waveguide cavity filter power divider, including:

[0006] A device body, provided with an input waveguide interface and at least two output waveguide interfaces;

[0007] A first slot, disposed on the device body, and the first slot is connected to the input waveguide interface;

[0008] At least two second slots, disposed on the device body, the second slots are respectively and correspondingly connected to the output waveguide interfaces, the first slot is respectively connected to each of the second slots, and the opening directions of the first slot and the second slots are on the same side of the device body;

[0009] A cover plate, covering the device body, and the cover plate is configured to form a first waveguide resonance cavity with the first slot and form a second waveguide resonance cavity with the second slot.

[0010] In some possible implementation manners, it further includes:

[0011] A first coupling channel, connecting the input waveguide interface and the first slot, and configured to couple an input signal and operate in a transverse electric wave resonance mode;

[0012] A second coupling channel, connecting the output waveguide interface and the second slot, and configured to couple an output signal and operate in a transverse electric wave resonance mode.

[0013] In some possible embodiments, along the opening direction of the first slot, the size of the first coupling channel or the second coupling channel is a first length, the size of the first slot or the second slot is a second length, and the first length is less than the second length.

[0014] In some possible embodiments, at least one of the input waveguide interface and the output waveguide interface is provided with a groove, and the groove is used to generate a null in the out-of-band frequency band.

[0015] In some possible embodiments, a first groove is formed on one side of the input waveguide interface close to the first coupling channel, and the surface where the opening of the first groove is located is flush with the bottom surface of the input waveguide interface;

[0016] A second groove is formed on one side of the output waveguide interface close to the second coupling channel, and the surface where the opening of the second groove is located is flush with the bottom surface of the output waveguide interface.

[0017] In some possible embodiments, it further includes:

[0018] At least two coupling windows, the output ends of which are respectively connected to at least two of the second slots in one-to-one correspondence, and the input ends of the at least two coupling windows are commonly connected to the first slot.

[0019] In some possible embodiments, a partition plate is provided on the device body, and the partition plate is used to separate the first slot and the second slot; the coupling window is an opening groove formed on the partition plate, and the surface where the opening of the opening groove is located is flush with the surfaces where the openings of the first slot and the second slot are located.

[0020] In some possible embodiments, a plurality of metal connection posts are arranged in an array on the side of the cover plate facing the device body. When the cover plate is buckled to the device body, there is a gap between the metal connection posts and the first slot and the second slot.

[0021] In some possible embodiments, the distance between any one of the first slot and the second slot and the metal connection post is less than 1 / 4λ; λ is the wavelength corresponding to the center frequency of the gap waveguide cavity filter power divider.

[0022] In some possible embodiments, a plurality of support posts are prominently formed on the device body, and the support posts are used to support the cover plate, and the height of the support posts is not less than the height of the metal connection posts.

[0023] The gap waveguide cavity filter power divider provided by the embodiment of the present application utilizes the first slot and the second slot opened on the device body. The cover plate is arranged on the device body. The cover plate and the first slot enclose and form a first waveguide resonance cavity, and the cover plate and the second slot enclose and form a second waveguide resonance cavity. The input signal enters the first slot of the device body and propagates to the first waveguide resonance cavity through the gap waveguide, so as to filter the frequency of the input signal by using the first waveguide resonance cavity and remove unnecessary frequency components. The second slot is connected to the output waveguide interface, and the filtered signal is distributed to different output waveguide interfaces in a required manner to achieve the power division effect. By precisely controlling the size of the gap, the signal of a specific frequency is selectively adjusted, the filtering performance is optimized, the contact loss and electromagnetic leakage are reduced, and the reliable transmission of high-frequency signals is ensured. Description of the Drawings

[0024] The drawings herein are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0025] Figure 1 It is a schematic diagram of the overall structure of the gap waveguide cavity filter power divider in the embodiment of the present application;

[0026] Figure 2 is Figure 1 a perspective view of the device body of the gap waveguide cavity filter power divider;

[0027] Figure 3 is Figure 1 a perspective view of a partial structure of the gap waveguide cavity filter power divider;

[0028] Figure 4 is Figure 3 the schematic diagram of the A-A cross-section in;

[0029] Figure 5 is Figure 1 a perspective view of a partial structure of the device body of the gap waveguide cavity filter power divider;

[0030] Figure 6 It is the connection topology diagram of the gap waveguide cavity filter power divider in the embodiment of the present application;

[0031] Figure 7a It is the trend diagram of the scattering parameters of the broadband filter power divider in the embodiment of the present application;

[0032] Figure 7b It is the schematic diagram of the amplitude difference and phase difference of the broadband filter power divider in the embodiment of the present application;

[0033] Figure 8a It is the trend diagram of the scattering parameters of the dual-band filter power divider in the embodiment of the present application;

[0034] Figure 8b This is a schematic diagram of the amplitude difference and phase difference of the dual-band filter power divider in the embodiments of the present application.

[0035] Description of Reference Numerals

[0036] 100, device body; 101, input waveguide interface; 102, output waveguide interface; 103, partition board; 104, support column;

[0037] 200, first slot; 201, first coupling channel; 202, first groove; 203, coupling window; 300, second slot; 301, second coupling channel; 302, second groove;

[0038] 400, cover plate; 401, metal connection column.

[0039] Through the above-mentioned drawings, specific embodiments of the present application have been shown, and more detailed descriptions will be given later. These drawings and text descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Detailed Embodiments

[0040] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals denote the same or similar components or components with the same or similar functions throughout. The described embodiments are some, but not all, of the embodiments of the present application. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present application and should not be construed as limiting the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application. The embodiments of the present application will be described in detail below with reference to the drawings.

[0041] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "mounted", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, or an indirect connection through an intermediate medium, or the internal connection or interaction relationship of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0042] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0043] The terms "first", "second", "third", "fourth", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein.

[0044] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or apparatus.

[0045] As mentioned in the background technology, filtering power dividers are implemented based on different transmission line technologies and structures, including different types of transmission methods such as microstrip lines, dielectric cavities, and substrate integrated waveguides. However, the above-mentioned filtering power dividers are rarely used in millimeter waves, and the dielectric loss is large, making it difficult to meet the requirements of high power capacity and low loss.

[0046] Gap Waveguide is a new type of artificial electromagnetic material based on a non-contact electromagnetic bandgap (EBG) structure. Its core principle is to form an electromagnetic bandgap between parallel conductor plates through a periodic structure (such as a metal needle array, a "bed of nails" or a mushroom-shaped texture), thereby suppressing the propagation of electromagnetic waves in the parallel plate mode while allowing the wave to be transmitted in a low-loss manner along a specific path (such as a ridge, groove or microstrip line).

[0047] However, there are relatively few filter power divider structures that use the gap waveguide principle in related technologies, and their applications in the millimeter wave field are relatively weak. They usually face technical difficulties such as difficulty in balancing low insertion loss and small size, and lack of transmission zero points, and their application is greatly limited.

[0048] Based on the above description, the gap waveguide cavity filter power divider provided by the embodiments of the present application utilizes the first slot and the second slot opened on the device body. The cover plate is arranged on the device body, and the cover plate and the first slot enclose to form a first waveguide resonant cavity, and the cover plate and the second slot enclose to form a second waveguide resonant cavity. The input signal enters the first slot of the device body and propagates to the first waveguide resonant cavity through the gap waveguide, thereby filtering the frequency of the input signal by using the first waveguide resonant cavity to remove unnecessary frequency components. The second slot is connected to the output waveguide interface, and the filtered signal is distributed to different output waveguide interfaces in a required manner to achieve the power division effect. By precisely controlling the size of the gap, the signal of a specific frequency is selectively adjusted to optimize the filtering performance, reduce the contact loss and electromagnetic leakage, and ensure the reliable transmission of high-frequency signals.

[0049] The gap waveguide cavity filter power divider according to the embodiments of the present application will be described below with reference to the accompanying drawings.

[0050] As Figure 1 and Figure 2 shown, the gap waveguide cavity filter power divider according to the embodiments of the present application includes a device body 100, a first slot 200 provided on the device body 100, at least two second slots 300, and a cover plate 400 covering the device body 100.

[0051] Among them, the device body 100 is provided with an input waveguide interface 101 and at least two output waveguide interfaces 102; the first slot 200 is provided on the device body 100, and the first slot 200 is connected to the input waveguide interface 101; at least two second slots 300 are provided on the device body 100, the second slots 300 are connected to the output waveguide interfaces 102 in one-to-one correspondence, the first slot 200 is respectively connected to each of the second slots 300, and the opening directions of the first slot 200 and the second slots 300 are located on the same side of the device body 100; the cover plate 400 covers the device body 100 and is configured to enclose with the first slot 200 to form a first waveguide resonant cavity and enclose with the second slot 300 to form a second waveguide resonant cavity.

[0052] It can be seen from the above description that the gap waveguide cavity filter power divider provided by the embodiments of the present application utilizes the cover plate 400 to cover the first slot 200 and the second slot 300 to respectively form a first waveguide resonant cavity and a second waveguide resonant cavity. By regulating the size and shape of the waveguide resonant cavity, filtering can be performed for a specific frequency range, and it is ensured that the input signal is distributed to multiple output channels to achieve the filtering power division effect.

[0053] In addition, the cover plate 400 and the device body 100 together form a gap waveguide. The gap waveguide guides the transmission of electromagnetic waves in a non-contact manner, thereby effectively reducing electromagnetic loss. Moreover, traditional gap waveguide cavity filter power dividers generally require complex metal contact components and alignment accuracy. However, for the structure of the embodiment of the present application, the gap regulation between the cover plate 400 and the device body 100 can be achieved through a simple manufacturing process. The opening directions of the first slot 200 and the second slot 300 are on the same side, and the cover plate 400 can cover all the slots at one time, simplifying the manufacturing and assembly processes and reducing the manufacturing cost.

[0054] The device body 100 of the embodiment of the present application can be prepared by stereolithography 3D printing technology. The device body 100 is made of a photo-curable resin material and electroplated with a copper material of 10μm - 12μm. Exemplarily, after the device body 100 is printed and formed, a copper layer of 10μm is electroplated to reduce the surface resistance.

[0055] Since the gap waveguide does not rely on the traditional transmission method of metal-contact waveguides, but guides electromagnetic waves through an exact physical gap. That is to say, the core of the gap waveguide lies in precisely controlling the size and shape of the gap in the structure. Therefore, the stereolithography 3D printing technology can ensure that the size of the device body 100 meets the usage requirements, and electroplating the copper material can ensure that the metal surface is smooth with low electromagnetic wave reflection loss, thereby achieving good gap waveguide performance. As an alternative implementation, other metal materials can be used instead of electroplated copper, such as silver, gold or other conductive materials.

[0056] The input waveguide interface 101 provided on the device body 100 is used to receive external signals and introduce the signals into the gap waveguide cavity filter power divider for processing. The input waveguide signal is usually connected to a signal source (such as a microwave transmitter, a radio frequency signal generator, etc.), or, in a communication system, is connected to an antenna through a waveguide or a coaxial cable. The output waveguide signal is used to output the filtered and power-divided signal to an external device (such as a receiver, a signal processor, an antenna array, etc.). Of course, the above connection and usage scenarios are only for illustrative purposes, and for different usage scenarios, the device ports actually connected to the device body 100 are also different.

[0057] The input waveguide interface 101 and the output waveguide interface 102 can be connected to external devices through a standard waveguide, or through a coaxial cable, or through bolts to the waveguide flange of the external device. The embodiment of the present application does not make an absolute limitation in this regard.

[0058] In addition, the gap waveguide cavity filter power divider in the embodiment of the present application is a one-to-two power divider. In some embodiments, four or other numbers of output waveguide interfaces 102 can also be provided to achieve a one-to-many power division effect.

[0059] In the embodiments of the present application, as Figure 2 shown, the opening directions of the first slot 200 and the second slot 300 are the same direction, both above the device body 100. After the cover plate 400 is covered on the device body 100, a waveguide resonance cavity is formed by the gaps between the cover plate 400 and the first slot 200 and the second slot 300.

[0060] Specifically, a plurality of metal connection posts 401 are arranged in an array on the side of the cover plate 400 facing the device body 100. When the cover plate 400 is buckled on the device body 100, there is a gap between the metal connection posts 401 and the first slot 200 and the second slot 300. The metal connection posts 401 can adopt metal pins, mushroom pins or other columnar structures. The gaps formed between the metal connection posts 401 and the first slot 200 and the second slot 300 together form the aforementioned first waveguide resonance cavity and second waveguide resonance cavity.

[0061] It should be noted that the lengths of the metal connection posts 401 on the cover plate 400 are the same and evenly arranged. Thus, the array of the metal connection posts 401 constitutes an electromagnetic band gap structure (Electromagnetic Band Gap, EBG), suppressing electromagnetic leakage of non-waveguide paths, enabling waveguide signals to propagate only along the path directions of the first slot 200 and the second slot 300, and reducing radiation loss. The gaps between the metal connection posts 401 and the first slot 200 and between the metal connection posts 401 and the second slot 300 are the same, avoiding problems such as signal reflection, waveguide loss or distortion caused by uneven gaps.

[0062] Here, the distance between any one of the first slot 200 and the second slot 300 and the metal connection posts 401 is less than 1 / 4λ; λ is the wavelength corresponding to the center frequency of the gap waveguide cavity filter power divider. For example, corresponding to the 60 GHz frequency band, λ is approximately 5 mm, and the distance between any one of the first slot 200 and the second slot 300 and the metal connection posts 401 is controlled within 0.3 - 1.2 mm. This design can avoid the excitation of higher-order modes.

[0063] In the above solution, the cover plate 400 provided with the metal connection posts 401 serves as an Artificial Magnetic Conductor (AMC), while the bottom cavity is surrounded by five edges, and the edges are regarded as Perfect Electrical Conductors (PEC) to form an HM-GGWR. When the air gap g between the metal connection posts 401 and the first slot 200 and the second slot 300 is less than λ / 4, the parallel plates form an Electromagnetic Band Gap (EBG) structure, generating a stop band that restricts electromagnetic waves, thereby effectively preventing electromagnetic leakage between metal layers.

[0064] Further, in some embodiments, the spacing between any one of the first slot 200 and the second slot 300 and the metal connection post 401 is less than 1 / 20λ. For example, corresponding to the 30 GHz frequency band, λ is approximately 10 mm, and the spacing between any one of the first slot 200 and the second slot 300 and the metal connection post 401 is controlled within 0.3 - 0.5 mm. This design can avoid the excitation of higher-order modes.

[0065] In some embodiments, as Figure 2 shown, a plurality of support posts 104 are protrudingly formed on the device body 100. The support posts 104 are used to support the cover plate 400, and the height of the support posts 104 is not less than the height of the metal connection posts 401.

[0066] The support posts 104 are respectively arranged on the four peripheral edges of the device body 100. An internal threaded section is formed inside the support posts 104. Through holes are provided in the cover plate 400 corresponding to the regions of the support posts 104. When the cover plate 400 is covered on the device body 100, it is fixedly connected by a bolt member that penetrates through the cover plate 400 and the support posts 104 together, thereby ensuring the tight connection between the cover plate 400 and the device body 100. The support posts 104 are located around the device body 100, which can disperse the pressure of the cover plate 400 and reduce local stress concentration. Preferably, the support posts 104 are made of a non-conductive material with a low dielectric constant and low loss, such as polytetrafluoroethylene, ceramic materials, etc., to avoid introducing parasitic capacitance or electromagnetic scattering.

[0067] It should be noted here that the support posts 104, as the only contact points between the cover plate 400 and the device body 100, ensure that a design gap is maintained between the metal connection posts 401 and the device body 100, avoiding additional losses caused by the direct contact between the metal connection posts 401 and the surface of the device body 100. At the same time, the height of the support posts 104 is not less than the height of the metal connection posts 401, which can also prevent the metal connection posts 401 from deforming and collapsing during assembly or external force extrusion, and maintain the electromagnetic characteristics of the gap waveguide.

[0068] As Figure 3 and Figure 4As shown, in some embodiments, the gap waveguide cavity filter power divider further includes a first coupling channel 201 and a second coupling channel 301. The first coupling channel 201 connects the input waveguide interface 101 and the first slot 200, and is configured to couple the input signal and operate in the transverse electric wave resonance mode; the second coupling channel 301 connects the output waveguide interface 102 and the second slot 300, and is configured to couple the output signal and operate in the transverse electric wave resonance mode.

[0069] In the above embodiments, the first coupling channel 201 couples the input signal and operates in the transverse electric wave resonance mode (TE mode), and the second coupling channel 301 couples the output signal and operates in the transverse electric wave resonance mode (TE mode). The electric field component of the transverse electric wave resonance mode is perpendicular to the propagation direction, and the magnetic field component has a component in the propagation direction, which is suitable for efficient signal output and power distribution. Through the TE wave mode, the second coupling channel 301 can efficiently couple the filtered signal from the second waveguide resonator to the output waveguide interface 102, and utilize the symmetric distribution of the narrow-side electric field to achieve the power equalization effect. Here, the first coupling channel 201 and the second coupling channel 301 can also be constructed as resonant diaphragms.

[0070] As Figure 5 shown, in some embodiments, along the opening direction of the first slot 200, the size of the first coupling channel 201 or the second coupling channel 301 is a first length, and the size of the first slot 200 or the second slot 300 is a second length, and the first length is less than the second length.

[0071] The first coupling channel 201 and the second coupling channel 301 in the above embodiments are both rectangular channels, and the first length is less than the second length, which can better control the coupling efficiency of the signal, ensure that the signal is efficiently transmitted from the output waveguide interface 102 to the first waveguide resonator, or from the second waveguide resonator to the output waveguide interface 102. The small-sized first coupling channel 201 and second coupling channel 301 limit the propagation path of the electromagnetic wave, which is beneficial to improving the isolation of the device body 100.

[0072] Generally speaking, by optimizing and adjusting the size relationship of the first coupling channel 201 and the second coupling channel 301, the first slot 200 and the second slot 300, the resonance frequency and bandwidth of the waveguide resonator can be adjusted to meet specific filtering requirements.

[0073] As Figure 5 and Figure 6 shown, in the gap waveguide cavity filter power divider according to the embodiment of the present application, a groove is provided in at least one of the input waveguide interface 101 and the output waveguide interface 102, and the groove is used to generate a zero point in the out-of-band frequency band.

[0074] Specifically, a first groove 202 is formed on one side of the input waveguide interface 101 close to the first coupling channel 201, and the surface where the opening of the first groove 202 is located is flush with the bottom surface of the input waveguide interface 101; a second groove 302 is formed on one side of the output waveguide interface 102 close to the second coupling channel 301, and the surface where the opening of the second groove 302 is located is flush with the bottom surface of the output waveguide interface 102.

[0075] The surface where the opening of the first groove 202 is located is flush with the bottom surface of the input waveguide interface 101, and the surface where the opening of the second groove 302 is located is flush with the bottom surface of the output waveguide interface 102, which can make the opening surface of the groove seamlessly connect with the inner wall of the waveguide interface, without a sudden geometric structure, thereby avoiding signal reflection caused by the sudden change in the size of the joint position between the groove and the waveguide interface. The flush design makes the transition of the signal between the waveguide interface and the groove smoother, reducing signal loss and voltage standing wave ratio.

[0076] In the above embodiment, the first groove 202 and the second groove 302 are essentially a resonant cavity, both acting as a stopband resonant cavity. The length, width and depth of the stopband resonant cavity determine the resonant frequency. When the signal frequency approaches the resonant frequency of the first groove 202 or the second groove 302, the first groove 202 or the second groove 302 will absorb or reflect the signal energy, thereby forming a transmission zero point in the transmission characteristics.

[0077] Exemplarily, taking the first groove 202 as an example, when the depth of the first groove 202 increases, the resonant frequency decreases, and the transmission zero point moves towards the low-frequency direction; when the length or width of the first groove 202 increases, the resonant frequency decreases, and the transmission zero point moves towards the low-frequency direction; conversely, when the depth of the first groove 202 decreases, the resonant frequency increases, and the transmission zero point moves towards the high-frequency direction; when the length or width of the first groove 202 decreases, the resonant frequency increases, and the transmission zero point moves towards the high-frequency direction. Therefore, by adjusting the sizes of the first groove 202 and the second groove 302, the position of the transmission zero point can be correspondingly adjusted, and the transmission zero point can be set in the out-of-band frequency band to suppress unwanted frequency components, thereby optimizing the frequency response curve of the slot waveguide cavity filter power divider and improving the out-of-band rejection performance and frequency selectivity.

[0078] As Figure 2 and Figure 6 shown, in some embodiments, the slot waveguide cavity filter power divider further includes at least two coupling windows 203. The output ends of the coupling windows 203 are respectively connected to the second slots 300 in one-to-one correspondence, and the input ends of the at least two coupling windows 203 are commonly connected to the first slot 200.

[0079] Specifically, a partition plate 103 is provided on the device body 100. The partition plate 103 is used to separate the first slot 200 and the second slot 300. The coupling window 203 is an opening slot formed on the partition plate 103, and the surface where the opening of the opening slot is located is flush with the surfaces where the openings of the first slot 200 and the second slot 300 are located.

[0080] The partition plate 103 in the above embodiment is used to physically separate the first slot 200 and the second slot 300, avoiding direct signal leakage or crosstalk. The sizes of the coupling windows 203 are smaller than those of the first slot 200 and the second slot 300. The surface where the opening of the coupling window 203 is located is flush with the surfaces where the openings of the first slot 200 and the second slot 300 are located, which can avoid signal reflection caused by sudden changes in geometric dimensions during signal transmission, thereby being beneficial to reducing signal loss. The signal passing through the first waveguide resonator is transmitted to the second waveguide resonator by using the provided coupling window 203.

[0081] Here, it should be noted that in the embodiments of the present application, by adjusting the topological parameters, the gap waveguide cavity filter power divider can be designed as a broadband filter power divider or a dual-band filter power divider.

[0082] Exemplarily, the broadband filter power divider is used to expand the bandwidth of the filter. The coupling strength between the first waveguide resonator and the second waveguide resonator can be changed by adjusting the width or depth of the coupling window 203, thereby expanding the bandwidth. Or, by optimizing the sizes of the first slot 200 and the second slot 300, the resonant frequency and bandwidth are adjusted as a whole. The topological parameters are optimized by using electromagnetic simulation software (High Frequency Structure Simulator, HFSS) and adjusted to appropriate parameters to meet the broadband filtering requirements.

[0083] As Figure 7a and Figure 7b shown, Figure 7a It is a trend diagram of the scattering parameters of the broadband filter power divider. The abscissa is the frequency range, which is used to analyze the performance of the device at different frequencies. The ordinate is the magnitude of the S parameter (Scattering Parameters), which is used to analyze the performance of the multi-port network. Figure 7b It is a schematic diagram of the amplitude difference and phase difference of the broadband filter power divider. The abscissa is the frequency range. The left ordinate is the phase difference between the two output ports, and the right ordinate is the amplitude difference between the two output ports.

[0084] In the design requirements of the broadband filter power divider, the resonant modes of the first waveguide resonator and the second waveguide resonator are TM 110 , and a total of four in-band resonant points and two out-of-band transmission zeros are realized, specifically: Figure 7aThe mid-resonance points 1 and resonance point 2 are generated by the first waveguide resonator and the second waveguide resonator. The resonance points 3 and resonance point 4 are generated by the first coupling channel 201 and the second coupling channel 301. The out-of-band transmission zero point 1 is generated by the first groove 202 near the input waveguide interface 101, and the out-of-band transmission zero point 2 is generated by the second groove 302 near the output waveguide interface 102.

[0085] In addition, the exemplary parameters of the designed broadband filter power divider are designed as follows: in the Ka band, the insertion loss < (3 + 0.15) dB, the bandwidth is 11.2%, the amplitude difference < 0.05 dB, and the phase difference < .

[0086] Similarly, as Figure 8a and Figure 8b shown, Figure 8a is the trend diagram of the scattering parameters of the dual-band filter power divider. The abscissa is the frequency range, which is used to analyze the performance of the device at different frequencies. The ordinate is the amplitude of the S parameter (Scattering Parameters), which is used to analyze the performance of the multi-port network. Figure 8b is the schematic diagram of the amplitude difference and phase difference of the dual-band filter power divider. The abscissa is the frequency range, the left ordinate is the phase difference, and the right ordinate is the amplitude difference.

[0087] The dual-band filter power divider is used to implement two independent passbands, which respectively correspond to different frequency ranges. The frequency interval and bandwidth of the two passbands can be adjusted by changing the position of the coupling window 203. Or, the grooves designed on the input waveguide interface 101 and the output waveguide interface 102 correspond to different frequencies respectively, generating out-of-band transmission zero points to form the dual-band characteristics. The topological parameters are optimized using electromagnetic simulation software (High Frequency Structure Simulator, HFSS) and adjusted to appropriate parameters to meet the dual-band filtering requirements.

[0088] As Figure 8a shown, in the design requirements of the dual-band filter power divider, the resonance modes of the first waveguide resonator and the second waveguide resonator are TM 110 , and a total of four in-band resonance points and two out-of-band transmission zero points are realized. Specifically: the resonance points 1 and resonance point 2 in the figure are generated by the first waveguide resonator and the second waveguide resonator, the resonance points 3 and resonance point 4 are generated by the first coupling channel 201 and the second coupling channel 301, the out-of-band transmission zero point 1 is generated by the first groove 202 near the input waveguide interface 101, and the out-of-band transmission zero point 2 is generated by the second groove 302 near the output waveguide interface 102.

[0089] In addition, the exemplary parameters of the designed dual-band filter power divider are designed as follows: in the Ka band, the insertion loss < (3 + 0.3) / (3 + 0.31) dB, the bandwidth is 2.7% / 3.2%, the amplitude difference < 0.03 / 0.06 dB, and the phase difference < .

[0090] The gap waveguide cavity filter power divider provided by the embodiment of the present application realizes low insertion loss and good electrical contact by using the gap slot waveguide, realizes a smaller size by using the coupling structure of the half-mode resonators of the first slotted groove 200 and the second slotted groove 300, and the first coupling channel 201 and the second coupling channel 301. The first groove 202 and the second groove 302 are provided to form a stopband resonator, thereby generating two out-of-band transmission zeros to achieve better stopband performance. The broadband filter power divider and the dual-band filter power divider can also be flexibly converted by topologically adjusting the coupling coefficient. The device can be used in the Ka band, is easy to manufacture, and has good working characteristics.

[0091] The gap waveguide cavity filter power divider provided by the embodiment of the present application can be applied to various different usage scenarios. For example, it can effectively distribute the signals from the base station to multiple in-building antennas to ensure that each antenna can receive appropriate signal strength and quality. Or, in a multi-band in-building system, the filter power divider can effectively separate and process signals of different bands, reduce interference, and improve signal clarity; it can be integrated with other components (such as amplifiers, filters, etc.) to form a more complex in-building antenna system to meet specific coverage and capacity requirements, etc. In this regard, the specific application scenarios of the gap waveguide cavity filter power divider are not absolutely limited.

[0092] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include the common general knowledge or conventional technical means in the technical field not disclosed in the present application.

[0093] It should be understood that the present application is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present application is only limited by the appended claims.

Claims

1. A gap waveguide cavity filter power divider, characterized in that Comprising: A device body (100) provided with an input waveguide interface (101) and at least two output waveguide interfaces (102); A first slot (200) provided on the device body (100), the first slot (200) being connected to the input waveguide interface (101); At least two second slots (300) provided on the device body (100), the second slots (300) being connected to the output waveguide interfaces (102) in one-to-one correspondence, the first slot (200) being connected to each of the second slots (300) respectively, and the opening directions of the first slot (200) and the second slots (300) being on the same side of the device body (100); A cover plate (400) covering the device body (100), the cover plate (400) being configured to form a first waveguide resonance cavity with the first slot (200) and a second waveguide resonance cavity with the second slots (300); A first coupling channel (201) connecting the input waveguide interface (101) and the first slot (200), configured to couple an input signal and being in a transverse electric wave resonance mode; A second coupling channel (301) connecting the output waveguide interface (102) and the second slot (300), configured to couple an output signal and being in a transverse electric wave resonance mode; At least two coupling windows (203), the output ends of which are respectively connected to at least two of the second slots (300) in one-to-one correspondence, and the input ends of the at least two coupling windows (203) are commonly connected to the first slot (200).

2. The gap waveguide cavity filter power divider according to claim 1, characterized in that Along the opening direction of the first slot (200), the size of the first coupling channel (201) or the second coupling channel (301) is a first length, and the size of the first slot (200) or the second slot (300) is a second length, and the first length is less than the second length.

3. The gap waveguide cavity filter power divider according to claim 1, characterized in that At least one of the input waveguide interface (101) and the output waveguide interface (102) is provided with a groove for generating a null in an out-of-band frequency band.

4. The gap waveguide cavity filter power divider according to claim 3, characterized in that A first groove (202) is formed on the side of the input waveguide interface (101) close to the first coupling channel (201), and the surface where the opening of the first groove (202) is located is flush with the bottom surface of the input waveguide interface (101); A second groove (302) is formed on the side of the output waveguide interface (102) close to the second coupling channel (301), and the surface where the opening of the second groove (302) is located is flush with the bottom surface of the output waveguide interface (102).

5. The gap waveguide cavity filter power divider according to claim 1, wherein A partition plate (103) is provided on the device body (100), and the partition plate (103) is used to separate the first slot (200) and the second slots (300); the coupling window (203) is an opening slot formed on the partition plate (103), and the surface where the opening of the opening slot is located is flush with the surfaces where the openings of the first slot (200) and the second slots (300) are located.

6. The gap waveguide cavity filter power divider according to any one of claims 1 to 5, characterized in that A plurality of metal connection posts (401) are arranged in an array on one side of the cover plate (400) facing the device body (100). When the cover plate (400) is buckled to the device body (100), there is a gap between the metal connection posts (401) and the first slot (200) and the second slot (300).

7. The gap waveguide cavity filter power divider according to claim 6, characterized in that, The distance between any one of the first slot (200) and the second slot (300) and the metal connection post (401) is less than 1 / 4λ; λ is the wavelength corresponding to the center frequency of the gap waveguide cavity filter power divider.

8. The gap waveguide cavity filter power divider according to claim 6, characterized in that, A plurality of support posts (104) are protrudingly formed on the device body (100), and the support posts (104) are used to support the cover plate (400), and the height of the support posts (104) is not less than the height of the metal connection posts (401).

Images