Gap waveguide cavity filtering power divider

Abstract

The embodiment of the invention provides a gap waveguide cavity filtering power divider, and belongs to the technical field of filtering power dividers, the gap waveguide cavity filtering power divider comprises a device body, a first slot, at least two second slots and a cover plate, 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 the first slot is connected with the input waveguide interface; the at least two second open slots are formed in the device body, the second open slots are connected with the output waveguide interfaces in a one-to-one correspondence mode, the first open slots are connected with the second open slots respectively, and the opening directions of the first open slots and the second open slots are located on the same side of the device body; the cover plate is arranged on the device body, and is configured to define a first waveguide resonant cavity with the first slot and define a second waveguide resonant cavity with the second slot. The gap waveguide cavity filtering power divider provided by the embodiment of the invention is simple in structure, can reduce the insertion loss, and has better stop-band performance.

Description

Technical Field

[0001] The present application relates to communication antenna technology, and in particular to a gap waveguide cavity filter power divider. Background Art

[0002] As a new type of RF 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 of modern communications due to its integrated and multifunctional characteristics.

[0003] In the related technology, the filtering 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-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. Summary of the invention

[0004] The present application provides a gap waveguide cavity filter power divider to solve the technical problem of large dielectric loss of the filter power divider in the related art.

[0005] The present application provides a gap waveguide cavity filter power divider, comprising:

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

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

[0008] at least two second slots are provided on the device body, the second slots are connected to the output waveguide interfaces in a one-to-one correspondence, the first slots are connected to the second slots respectively, and the opening directions of the first slots and the second slots are located on the same side of the device body;

[0009] A cover plate is disposed on the device body, and the cover plate is configured to form a first waveguide resonant cavity with the first slotted structure, and to form a second waveguide resonant cavity with the second slotted structure.

[0010] In some possible implementations, the following further includes:

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

[0012] The second coupling channel is connected to the output waveguide interface and the second slot, and is configured to couple the output signal and be in a transverse electric wave resonance mode.

[0013] In some possible implementations, 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 smaller than the second length.

[0014] In some possible implementations, 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 zero point in an out-of-band frequency band.

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

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

[0017] In some possible implementations, the following further includes:

[0018] At least two coupling windows, output ends of which are respectively connected to at least two of the second slots in a one-to-one correspondence, and 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 groove and the second groove; the coupling window is an open groove constructed on the partition plate, and the surface where the opening of the open groove is located is flush with the surface where the openings of the first groove and the second groove are located.

[0020] In some possible implementations, a plurality of metal connection pillars are arranged in an array on one side of the cover plate facing the device body, and when the cover plate is buckled with the device body, there are gaps between the metal connection pillars and the first slot and the second slot.

[0021] In some possible implementations, the spacing between any one of the first slot and the second slot and the metal connecting column 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 implementations, a plurality of support columns are protruding from the device body, and the support columns are used to support the cover plate. The height of the support columns is not less than the height of the metal connecting columns.

[0023] The gap waveguide cavity filter power divider provided in the embodiment of the present application utilizes a first slot and a second slot provided on a device body, a cover plate is provided on the device body, the cover plate and the first slot form a first waveguide resonant cavity, and the cover plate and the second slot form a second waveguide resonant cavity. An input signal enters the first slot of the device body and is propagated to the first waveguide resonant cavity through the gap waveguide, thereby utilizing the first waveguide resonant cavity to filter the frequency of the input signal 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 as required, thereby achieving a power division effect. By precisely controlling the size of the gap, a 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0025] Figure 1 This 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 for Figure 1 A three-dimensional diagram of the device body of the medium-gap waveguide cavity filter power divider;

[0027] Figure 3 for Figure 1 A partial structural perspective view of a medium-gap waveguide cavity filter power divider;

[0028] Figure 4 for Figure 3 AA section diagram in;

[0029] Figure 5 for Figure 1 A three-dimensional diagram of the partial structure of the device body of the medium-gap waveguide cavity filter power divider;

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

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

[0032] Figure 7b Schematic diagram of amplitude difference and phase difference of a broadband filter power divider in an embodiment of the present application;

[0033] Figure 8a This is a scattering parameter trend diagram of the dual-passband filter power divider in the embodiment of the present application;

[0034] Figure 8b Schematic diagram of the amplitude difference and phase difference of the dual-passband filtering power divider in the embodiment of the present application.

[0035] Description of Reference Numerals

[0036] 100, device body; 101, input waveguide interface; 102, output waveguide interface; 103, partition plate; 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 connecting column.

[0039] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope 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 DESCRIPTION

[0040] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiment of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application. The embodiments of the present application are described in detail below in conjunction with the drawings.

[0041] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this 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 in the embodiment of the present application utilizes the first slot and the second slot opened on the device body, and the cover plate is arranged on the device body. The cover plate and the first slot form a first waveguide resonant cavity, and the cover plate and the second slot 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, so that the frequency of the input signal is filtered by the first waveguide resonant cavity to remove unnecessary frequency components. The second slot is connected to the output waveguide interface to distribute the filtered signal to different output waveguide interfaces as needed 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 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 embodiment of the present application is described below with reference to the accompanying drawings.

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

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

[0052] It can be seen from the above description that the gap waveguide cavity filter power divider provided in the embodiment of the present application utilizes a 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 adjusting 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 a filtering power division effect.

[0053] In addition, the cover plate 400 and the device body 100 together constitute a gap waveguide, which guides the transmission of electromagnetic waves in a contactless manner, thereby effectively reducing electromagnetic losses. Traditional gap waveguide cavity filter power dividers generally require complex metal contact components and alignment accuracy. However, in the structure of the embodiment of the present application, the gap control between the cover plate 400 and the device body 100 can be achieved through a simple processing process. The opening directions of the first slot 200 and the second slot 300 are located on the same side, and the cover plate 400 can cover all the slots at one time, which simplifies the manufacturing and assembly process and reduces 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 photopolymer resin material and electroplated with 10μm-12μm copper material. Exemplarily, after the device body 100 is printed, a 10μm copper layer is electroplated to reduce surface resistance.

[0055] Since the gap waveguide does not rely on the traditional transmission method of the metal contact waveguide, but guides the electromagnetic wave through a precise physical gap, that is, the core of the gap waveguide is to accurately control the size and shape of the gap in the structure. Therefore, the use of stereolithography 3D printing technology can ensure that the size of the device body 100 meets the use requirements, and through the electroplated copper material, the metal surface is smooth and has low electromagnetic wave reflection loss, thereby achieving good gap waveguide performance. As an alternative embodiment, the electroplated copper can also be replaced by other metal materials, such as metal 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 signal after filtering and power distribution 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 used as instructions for use. For different usage scenarios, the device port actually connected to the device body 100 is also different.

[0057] The input waveguide interface 101 and the output waveguide interface 102 may be connected to an external device via a standard waveguide, or connected to an external device via a coaxial cable, or connected to a waveguide flange of an external device via bolts, and this embodiment of the present application does not impose an absolute limitation on this.

[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 may be provided to achieve a one-to-many power dividing effect.

[0059] In the present application embodiment, Figure 2 As shown, the opening directions of the first slot 200 and the second slot 300 are in the same direction, both of which are above the device body 100. After the cover plate 400 is covered on the device body 100, a waveguide resonant cavity is formed through the gap between the cover plate 400 and the first slot 200 and the second slot 300.

[0060] Specifically, a plurality of metal connecting pillars 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 with the device body 100, there is a gap between the metal connecting pillars 401 and the first slot 200 and the second slot 300. The metal connecting pillars 401 can be metal pins, mushroom pins or other columnar structures. The gaps formed between the metal connecting pillars 401 and the first slot 200 and the second slot 300 together form the aforementioned first waveguide resonant cavity and the second waveguide resonant cavity.

[0061] It should be noted that the lengths of the metal connecting posts 401 on the cover plate 400 are consistent and evenly arranged, so that the array of metal connecting posts 401 forms an electromagnetic band gap (EBG) structure, which suppresses electromagnetic leakage in non-waveguide paths, so that the waveguide signal propagates only along the path direction of the first slot 200 and the second slot 300, thereby reducing radiation loss. The gaps between the metal connecting post 401 and the first slot 200 and between the metal connecting post 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 spacing between any one of the first slot 200 and the second slot 300 and the metal connecting column 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 60GHz frequency band, λ is approximately 5mm, and the spacing between any one of the first slot 200 and the second slot 300 and the metal connecting column 401 is controlled to be 0.3-1.2mm. This design can avoid high-order mode excitation.

[0063] In the above scheme, the cover plate 400 provided with the metal connecting column 401 is used as an artificial magnetic conductor (AMC), and the bottom cavity is surrounded by five edges, which are regarded as perfect electrical conductors (PEC) to form a HM-GGWR. When the air gap g between the metal connecting column 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 limits electromagnetic waves, thereby effectively preventing electromagnetic leakage between metal layers.

[0064] Furthermore, in some embodiments, the spacing between any one of the first slot 200 and the second slot 300 and the metal connecting pillar 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 connecting pillar 401 is controlled to be 0.3-0.5 mm. This design can avoid the excitation of high-order modes.

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

[0066] The support columns 104 are respectively arranged on the four edges of the device body 100, and an internal thread section is constructed in the support column 104. The cover plate 400 is provided with a through hole in the area corresponding to the support column 104. When the cover plate 400 is covered on the device body 100, it is fixedly connected by bolts that penetrate the cover plate 400 and the support column 104 together, thereby ensuring the tight connection between the cover plate 400 and the device body 100. The support columns 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 column 104 is made of a non-conductive material with low dielectric constant and low loss, such as polytetrafluoroethylene, ceramic material, etc., to avoid the introduction of parasitic capacitance or electromagnetic scattering.

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

[0068] like Figure 3 and Figure 4As shown, in some embodiments, the gap waveguide cavity filter power divider also 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 is in a 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 is in a transverse electric wave resonance mode.

[0069] In the above embodiment, the first coupling channel 201 couples the input signal and is in the transverse electric wave resonance mode (TE mode), and the second coupling channel 301 couples the output signal and is 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 resonant cavity to the output waveguide interface 102, and achieve the power sharing effect by using the symmetrical distribution of the narrow-side electric field. Here, the first coupling channel 201 and the second coupling channel 301 can also be constructed as a resonant diaphragm.

[0070] like Figure 5 As 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, the size of the first slot 200 or the second slot 300 is a second length, and the first length is smaller than the second length.

[0071] In the above-mentioned embodiment, the first coupling channel 201 and the second coupling channel 301 are both rectangular channels, and the first length is smaller than the second length, which can better control the coupling efficiency of the signal and ensure that the signal is efficiently transmitted from the output waveguide interface 102 to the first waveguide resonant cavity, or from the second waveguide resonant cavity to the output waveguide interface 102. The small size of the first coupling channel 201 and the second coupling channel 301 limits 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 between the first coupling channel 201 and the second coupling channel 301 , and the first slot 200 and the second slot 300 , the resonant frequency and bandwidth of the waveguide resonant cavity can be adjusted to meet specific filtering requirements.

[0073] like Figure 5 and Figure 6 As shown, in the gap waveguide cavity filter power divider in the embodiment of the present application, a groove is provided at 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 configured on a side of the input waveguide interface 101 close to the first coupling channel 201, and a surface where an opening of the first groove 202 is located is flush with a bottom surface of the input waveguide interface 101; a second groove 302 is configured on a side of the output waveguide interface 102 close to the second coupling channel 301, and a surface where an opening of the second groove 302 is located is flush with a 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, so that the opening surface of the groove can be seamlessly connected with the inner wall of the waveguide interface without a sudden geometric structure, thereby avoiding signal reflection caused by a sudden change in the size of the joint position of the groove and the waveguide interface during signal transmission. The flush design makes the transition of the signal between the waveguide interface and the groove smoother, reducing signal loss and standing wave ratio.

[0076] In the above embodiment, the first groove 202 and the second groove 302 are essentially a resonant cavity, and both play the role of a stopband resonant cavity. The length, width and depth of the stopband resonant cavity determine the resonant frequency. When the signal frequency is close to 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, as the depth of the first groove 202 increases, the resonant frequency decreases, and the transmission zero point moves toward the low frequency direction; as the length or width of the first groove 202 increases, the resonant frequency decreases, and the transmission zero point moves toward the low frequency direction; conversely, as the depth of the first groove 202 decreases, the resonant frequency increases, and the transmission zero point moves toward the high frequency direction; as the length or width of the first groove 202 decreases, the resonant frequency increases, and the transmission zero point moves toward the high frequency direction. Therefore, by adjusting the size of the first groove 202 and the second groove 302, the position of the transmission zero point can be adjusted accordingly, and the transmission zero point can be set in the out-of-band frequency band to suppress unnecessary frequency components, thereby optimizing the frequency response curve of the gap waveguide cavity filter power divider and improving the out-of-band suppression performance and frequency selectivity.

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

[0079] Specifically, a partition plate 103 is provided on the device body 100, and the partition plate 103 is used to separate the first groove 200 and the second groove 300; the coupling window 203 is an open groove constructed on the partition plate 103, and the surface where the opening of the open groove is located is flush with the surface where the openings of the first groove 200 and the second groove 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 to avoid direct signal leakage or crosstalk. The size of the coupling window 203 is smaller than that 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 surface where the opening of the first slot 200 and the second slot 300 are located, which can avoid signal reflection due to sudden changes in geometric dimensions during signal transmission, thereby helping to reduce signal loss. The signal passing through the first waveguide resonant cavity is transmitted to the second waveguide resonant cavity using the set 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-passband 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 resonant cavity and the second waveguide resonant cavity can be changed by adjusting the width or depth of the coupling window 203, thereby expanding the bandwidth; or, the resonant frequency and bandwidth can be adjusted as a whole by optimizing the size of the first slot 200 and the second slot 300. The topology parameters are optimized using electromagnetic simulation software (High Frequency Structure Simulator, HFSS) and adjusted to appropriate parameters to meet the broadband filtering requirements.

[0083] like Figure 7a and Figure 7b As shown, Figure 7a This is a trend chart of the scattering parameters of a broadband filter power divider. The horizontal axis is the frequency range, which is used to analyze the performance of the device at different frequencies. The vertical axis is the amplitude of the S parameter (Scattering Parameters), which is used to analyze the performance of a multi-port network. Figure 7b Schematic diagram of the amplitude difference and phase difference of the broadband filter power divider. The horizontal axis is the frequency range, the vertical axis on the left is the phase difference of the two output ports, and the vertical axis on the right is the amplitude difference of the two output ports.

[0084] In the design requirements of broadband filter power divider, the resonance modes of the first waveguide resonant cavity and the second waveguide resonant cavity are TM 110 , a total of four in-band resonance points and two out-of-band transmission zero points are achieved, specifically: Figure 7aThe mid-resonance point 1 and the resonance point 2 are generated by the first waveguide resonant cavity and the second waveguide resonant cavity, the resonance point 3 and the 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 close to the input waveguide interface 101, and the out-of-band transmission zero point 2 is generated by the second groove 302 close to the output waveguide interface 102.

[0085] In addition, the exemplary parameter designs of the designed broadband filter power divider are: in the Ka band, the insertion loss is <(3+0.15)dB, the bandwidth is 11.2%, the amplitude difference is <0.05dB, and the phase difference is <0.8˚.

[0086] Similarly, if Figure 8a and Figure 8b As shown, Figure 8a This is a scattering parameter trend chart of a dual-passband filter power divider. The horizontal axis is the frequency range, which is used to analyze the performance of the device at different frequencies. The vertical axis is the amplitude of the S parameter (Scattering Parameters), which is used to analyze the performance of a multi-port network. Figure 8b Schematic diagram of the amplitude difference and phase difference of the dual-passband filter power divider. The horizontal axis is the frequency range, the vertical axis on the left is the phase difference, and the vertical axis on the right is the amplitude difference.

[0087] The dual-passband filter power divider is used to realize two independent passbands, which 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, generate out-of-band transmission zero points, and form dual-passband characteristics. The topology parameters are optimized using electromagnetic simulation software (High Frequency Structure Simulator, HFSS) and adjusted to appropriate parameters to meet the dual-passband filtering requirements.

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

[0089] In addition, the exemplary parameter designs of the designed dual-passband filter power divider are: in the Ka band, the insertion loss is <(3+0.3) / (3+0.31)dB, the bandwidth is 2.7% / 3.2%, the amplitude difference is <0.03 / 0.06dB, and the phase difference is <0.7˚ / 1.2˚.

[0090] The gap waveguide cavity filter power divider provided in the embodiment of the present application utilizes the gap slot waveguide to achieve low insertion loss and good electrical contact, utilizes the half-mode resonant cavity of the first slot 200 and the second slot 300, and the coupling structure of the first coupling channel 201 and the second coupling channel 301 to achieve a smaller size, forms a stopband resonant cavity by setting the first groove 202 and the second groove 302, thereby generating two out-of-band transmission zero points to achieve good stopband performance, and can also achieve flexible conversion between broadband filter power divider and dual-passband filter power divider 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 in the embodiment of the present application can be applied to various different usage scenarios, for example, effectively distributing signals from a base station to multiple indoor antennas to ensure that each antenna can receive appropriate signal strength and quality, or, in a multi-band indoor system, the filter power divider can effectively separate and process signals of different frequency bands to reduce interference and improve signal clarity; it can be integrated with other components (such as amplifiers, filters, etc.) to form a more complex indoor 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 appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.

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

Claims

1. A gap waveguide cavity filter power divider, characterized in that: include: A device body (100) is provided with an input waveguide interface (101) and at least two output waveguide interfaces (102); A first slot (200) is provided on the device body (100), wherein 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 a one-to-one correspondence, the first slots (200) are respectively connected to the second slots (300), and the opening directions of the first slots (200) and the second slots (300) are located on the same side of the device body (100); A cover plate (400) is disposed on the device body (100), and the cover plate (400) is configured to form a first waveguide resonant cavity with the first slot (200), and to form a second waveguide resonant cavity with the second slot (300).

2. The gap waveguide cavity filter power divider according to claim 1, characterized in that: Also includes: A first coupling channel (201), connected to the input waveguide interface (101) and the first slot (200), configured to couple an input signal and be in a transverse electric wave resonance mode; The second coupling channel (301) is connected to the output waveguide interface (102) and the second slot (300), and is configured to couple an output signal and be in a transverse electric wave resonance mode.

3. The gap waveguide cavity filter power divider according to claim 2, 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, the size of the first slot (200) or the second slot (300) is a second length, and the first length is smaller than the second length.

4. The gap waveguide cavity filter power divider according to claim 2, characterized in that: At least one of the input waveguide interface (101) and the output waveguide interface (102) is provided with a groove, and the groove is used to generate a zero point in an out-of-band frequency band.

5. The gap waveguide cavity filter power divider according to claim 4, characterized in that: A first groove (202) is configured 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 constructed 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).

6. The gap waveguide cavity filter power divider according to claim 1, characterized in that: Also includes: At least two coupling windows (203), the output ends of which are respectively connected to at least two of the second slots (300) in a one-to-one correspondence, and the input ends of the at least two coupling windows (203) are commonly connected to the first slot (200).

7. The gap waveguide cavity filter power divider according to claim 6, characterized in that: 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 slot (300); the coupling window (203) is an open slot constructed on the partition plate (103), and the surface where the opening of the open slot is located is flush with the surfaces where the openings of the first slot (200) and the second slot (300) are located.

8. The gap waveguide cavity filter power divider according to any one of claims 1 to 7, characterized in that: A plurality of metal connection pillars (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 onto the device body (100), there are gaps between the metal connection pillars (401) and the first slot (200) and the second slot (300).

9. The gap waveguide cavity filter power divider according to claim 8, characterized in that: The spacing between any one of the first slot (200) and the second slot (300) and the metal connecting column (401) is less than 1 / 4λ; λ is the wavelength corresponding to the center frequency of the gap waveguide cavity filter power divider.

10. The gap waveguide cavity filter power divider according to claim 8, characterized in that: A plurality of support columns (104) are protrudingly structured on the device body (100), the support columns (104) being used to support the cover plate (400), and the height of the support columns (104) being no less than the height of the metal connection columns (401).

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