53 results about "Waveguide filter" patented technology

The invention provides a high-isolation dual-band substrate integrated waveguide filter crossing device and a working method thereof. Comprising a dielectric layer (2), a top metal layer (1) located on the upper surface of the dielectric layer (2), a middle metal layer (3) located in the dielectric layer (2), a bottom metal layer (4) located on the lower surface of the dielectric layer (2), a first metalized through hole array (5), a second metalized through hole array (6) and a third metalized through hole array (7). The first metalized through hole array (5) penetrates through the dielectric layer (2) and is connected with the top metal layer (1), the middle metal layer (3) and the bottom metal layer (4); the second metalized through hole array (6) is connected with the top metal layer (1) and the middle metal layer (3); the third metalized through hole array (7) is connected with the bottom metal layer (4) and the middle metal layer (3); by applying the technical scheme, dual-band filtering response can be realized.

The invention discloses a high-selectivity waveguide filter based on a nonlinear frequency-variable coupling structure, which comprises three rectangular waveguide resonant cavities, an input waveguide port and an output waveguide port, and the first coupling metal column, the first coupling diaphragm, the first coupling metal block and the first metal baffle plate between the first resonant cavity and the second resonant cavity jointly form a first group of nonlinear frequency change coupling structures. And a second coupling metal column, a second coupling diaphragm, a second coupling metal block and a second metal baffle plate between the second rectangular waveguide resonant cavity and the third rectangular waveguide resonant cavity jointly form a second group of nonlinear frequency change coupling structures. The two groups of nonlinear frequency-variable coupling structures are used for coupling the three rectangular waveguide resonant cavities, and a reflection zero point and two transmission zero points are introduced into each rectangular waveguide resonant cavity, so that the filter response is a five-order Chebyshev response with four transmission zero points. The filter has the advantages of being compact in structure, high in selectivity, good in out-of-band rejection performance, simple in structure, easy to expand and the like, and has a good application prospect.

The application discloses a kind of multilayer double-channel substrate integrated waveguide filters, belong to microwave communication technical field, including sequentially stacked multiple SIW cavities, the second metal substrate of top layer SIW cavity is equipped with first direction slot gap;The first metal substrate of bottom layer SIW cavity is equipped with second direction slot gap;In intermediate SIW cavity: the first metal substrate of second layer SIW cavity is equipped with first direction slot gap, the second metal substrate of penultimate layer SIW cavity is equipped with second direction slot gap, and the rest metal substrate is all equipped with the cross slot gap combined into by first direction slot gap and second direction slot gap;First direction slot gap and second direction slot gap are aligned with cross slot gap;Filter first channel includes first input port, all first direction slot gap and first output port;Filter second channel includes second input port, all second direction slot gap and second output port.The application shows good frequency selection characteristic and high channel isolation.

The utility model discloses a waveguide filter bending strength detection device, and relates to the technical field of waveguide filter detection. The waveguide filter bending strength detection device comprises a base, a bending mechanism and a clamping mechanism, a supporting table is arranged over the base, four sets of supporting columns are fixedly installed between the top of the base and the bottom of the supporting table and evenly distributed at the four corners of the bottom of the supporting table, and the clamping mechanism is arranged on the supporting table. The clamping mechanism comprises toothed plates, gears, sliding plates, connecting rods and clamping plates, the two toothed plates are arranged at the bottom of the supporting table in an attached mode, two sliding grooves are formed in the bottom of the supporting table, and the sliding plates slidably installed in the corresponding sliding grooves are fixedly installed at the tops of the two toothed plates correspondingly. According to the waveguide filter bending strength detection device, two groups of clamping plates can be driven to move synchronously by pulling a single connecting rod with a single hand through the clamping mechanism, clamping and fixing are achieved at a time, the operation process is simplified, and the installation efficiency is improved.

The invention provides a dual-passband waveguide filter and a coupling topology thereof, the dual-passband waveguide filter comprises a metal structure, the interior of the metal structure comprises a torispherical cavity and two sections of feed waveguides, the torispherical cavity is divided into four quarter-spherical cavities by partition plate structures, and the quarter-spherical cavities are communicated with the feed waveguides. Every two adjacent quarter spherical cavities are in coupling connection through a coupling window, and the two feed waveguides are respectively in coupling connection with the two opposite quarter spherical cavities through coupling windows. The dual-passband waveguide filter coupling topology comprises a cellular structure with a resonant node and a non-resonant node, a metal structure is in a physical presentation form of the cellular structure, a quarter spherical cavity is the resonant node, a feed waveguide is the non-resonant node, and the metal structure is a metal structure. According to the coupling topology theory, dual-passband band-pass filtering response of any even order can be realized, and limited transmission zeros are introduced into the lower stop band and the upper stop band of the two passbands at the same time, so that the stop band performance of the dual-passband band-pass filtering response is improved.

Air cavity and ceramic waveguide resonator mixed filter solutions are disclosed. According to one aspect, a combined filter assembly includes an air cavity filter coupled to a ceramic waveguide (CWG) filter. The CWG filter exhibits a wall that presses against a rigid plate. Between the rigid plate and a wall of the air cavity filter is a compressible conductive gasket that is compressed between the wall of the air cavity filter and the rigid plate. The air cavity filter and the CWG filter are secured to a support base. The CWG filter is secured to the support base by flexible clamps that allow for thermal expansion of the CWG filter. The flexible clamps are secured to the support base by screws. The support base exhibits surfaces or walls that receive and anchor the screws.

The invention provides a ceramic waveguide filter with a side-out negative coupling structure, which comprises a dielectric ceramic body, at least four resonance holes, a negative coupling hole and a conductive layer, the upper surface of the dielectric ceramic body is provided with at least four resonance holes, the dielectric ceramic body is divided into at least four resonators, the joint of the four resonators is provided with a line-shaped groove, and the line-shaped groove is connected with the negative coupling hole. The negative coupling hole is arranged at the joint of two adjacent resonators, and the conductive layer is coated on the inner wall surfaces of the resonance hole, the straight slot and the negative coupling hole and the surface of the dielectric ceramic body; the negative coupling hole comprises the first hole penetrating through the side wall of the dielectric ceramic body, so that a side-out negative coupling structure can be formed, zero points are formed on the left side and the right side of a passband respectively, parasitic parameters can be adjusted and the positions of the two zero points can be balanced by adjusting the aperture of the first hole, the limitation during adjustment is small, a connecting rib is abandoned, and the cost is reduced. The influence on the overall strength of the ceramic waveguide filter is small, and the application range can be expanded.

The application relates to a Schottky diode-based terahertz frequency conversion component and belongs to the technical field of terahertz communication, wherein the frequency conversion component comprises a local oscillator frequency multiplication link, a terahertz subharmonic mixer and a waveguide filter which are electrically connected in sequence, and the terahertz subharmonic mixer is also electrically connected with an intermediate frequency filter. The Schottky diode is used to manufacture a Q-band tripler, the manufacturing cost is extremely low, the design difficulty of the local oscillator link is reduced, the local oscillator frequency demand is reduced by the harmonic mixer, the testability of the local oscillator link is improved, and the troubleshooting cost and time are reduced.

This invention discloses a small, low-profile substrate-integrated waveguide filter antenna for the W-band, relating to antenna technology and addressing problems in existing technologies. A rectangular resonant cavity is formed by metal pillars penetrating from the upper copper layer to the bottom copper layer; one end of the rectangular resonant cavity is open as a signal input terminal; four circular holes are arranged in a row and column pattern within the rectangular resonant cavity on the upper copper layer, with a metal circular patch within each hole serving as the corresponding resonator; the four circular holes have equal diameters; the rectangular resonant cavity with the four circular holes is used to excite the TE12 mode; the TE12 mode further excites the TM11 mode on the four metal circular patches (resonators); two of the four resonators are set to diameter D1, and the other two are set to diameter D2; two radiation nulls are generated based on an impedance mismatch method. The advantages are that it achieves a fusion design of the antenna and filter, the entire filter antenna design is compact, it generates two radiation nulls, and the gain reaches 11 dBi.

This utility model belongs to the field of filters, specifically a coaxial-to-waveguide filter, including a cavity with a waveguide port on the inner side. A coaxial connector is bolted to the top side of the waveguide port. Multiple resonant cavities are formed inside the cavity, and a coupling grounding post is installed inside the cavity through the resonant cavities. A coupling conductor is fixed between the waveguide port and one of the resonant cavities through a supporting insulating medium. One end of the coupling conductor is soldered to the coupling grounding post in the corresponding resonant cavity, and the other end extends into the waveguide port, realizing bidirectional coupling transmission of electromagnetic waves. This utility model introduces cross-coupling technology inside the filter, which significantly improves the out-of-band suppression compared to relying on natural attenuation, reduces the number of resonant cavities required to achieve the same suppression, thereby effectively reducing the product size and also reducing the filter insertion loss. This device achieves low port return loss through high out-of-band suppression.

A waveguide filter may include a waveguide conduit through which an electromagnetic wave propagates. The waveguide filter may include a resonant cavity comprising at least a portion of the waveguide conduit. The waveguide filter may include a variable dielectric material disposed adjacent to the resonant cavity. The waveguide filter may include a tuning electrode to apply an electric field through the variable dielectric material for modification of a permittivity of the variable dielectric material.

The utility model relates to the technical field of waveguide filters, and provides an improved high-power waveguide filter which comprises a base, a fixing frame is arranged above the base, a supporting block is fixed to the edge of the bottom face of the fixing frame, the lower end of the supporting block is fixed to the top face of the base, and a rotating hole is formed in the middle of the top face of the inner side of the fixing frame. A rotating plate is arranged below the rotating hole, and a rotating shaft is fixed to the edge of the top face of the rotating plate. The two semicircular blocks are clamped into the inner sides of the two semicircular grooves in the side wall of the mounting plate to fix the mounting plate, mounting of the filter body is completed, and the filter body can be mounted only by rotating the rotating plate by 180 degrees, driving the second gear to rotate by the rotating plate, driving the first gear to rotate by the second gear and driving the semicircular blocks to rotate by the first gear. And the semicircular block can be completely moved out of the inner side of the semicircular groove after rotating by 180 degrees, so that the filter body can be disassembled, the operation is simple and convenient, and quick disassembly and maintenance when a fault occurs are facilitated.

The application provides a pre-protection filter for superconducting tokamak millimeter wave diagnosis, and belongs to the technical field of magnetic confinement fusion plasma diagnosis, which can ensure the safety of sensitive millimeter wave receivers while keeping the integrity of the frequency spectrum, polarization and phase information of the to-be-measured signal to the maximum. The application adopts a single-band multi-section waveguide filter structure, which includes a band-pass filter for low-frequency band interference, a notch filter for interference in the diagnostic frequency band, and a low-pass filter for high-frequency band interference. The application can effectively protect against interference of different auxiliary heating frequency points and realize high-fidelity transmission of the received signal.

The invention discloses a multi-band common orthogonal head, and belongs to the technical field of microwave communication. The invention discloses a four-way symmetrical waveguide filter which comprises an axial multi-frequency shared waveguide assembly and four side wall branch waveguides, the axial multi-frequency shared waveguide assembly comprises a coupling waveguide, a corrugated groove gasket and a high-frequency waveguide, the side wall branch waveguides are uniformly distributed in a four-way symmetrical mode relative to the multi-frequency shared waveguide assembly, and each side wall branch waveguide comprises an evanescent mode filter and an impedance conversion section. The antenna has the advantages of being large in bandwidth, small in frequency band interval, compact in structure and easy to machine. According to the invention, the problems of mixed-mode suppression, small-frequency-band interval electrical design and difficult processing of a millimeter wave band structure during ultra-wideband use are solved, the influence of a high-order mode on a directional diagram of a feed source system can be effectively improved, the cross polarization of the antenna is reduced, and the antenna is suitable for engineering popularization.

The present disclosure relates to a triple-mode resonator (100) comprising a body made of a dielectric material and having a cuboid shape defining three orthogonal axes (x, y, z) substantially aligned with faces of the body, and a conductive coating covering all of the body except for portions of the faces of the body defining at least one coupling aperture (110, 120, 130, 110', 120', 130') through which a signal can be coupled into and / or out of the body, wherein the coupling aperture has a closed shape comprising a first (110a, 120a, 130a) and a second (110c, 120c, 130c) main edge extending along two of the axes, respectively, and a third main edge (110b, 120b, 130b) extending neither parallel nor perpendicular to the first and second main edges, the general shape and dimensions and position of the coupling aperture being mainly determined by the first, second and third main edges, and the coupling aperture being configured in such a way that an input signal introduced therethrough can independently excite the three desired main resonance modes in the triple-mode resonator (100). The present disclosure also relates to a waveguide filter comprising the above triple-mode resonator.

The dynamic ultra-selective waveguide filter (DUST) assembly includes a stack of a plurality of substrate integrated waveguide (SIW) filters, each of which includes a first and second conductive layers, a dielectric layer disposed between the first and second conductive layers to form a waveguide between an input port and an output port, and a plurality of conductive couplers that interconnect the first conductive layer and the second conductive layer through the dielectric layer. The DUST assembly further includes a switch network coupled to the stack of the SIW filters to provide discretely switched tuning or continuous tuning. The switch network includes Super Lattice Castellated Field Effect Transistor (SLCFET) switches to operate the discretely switched tuning or the continuous tuning.

A ceramic waveguide filter is disclosed. According to at least one embodiment of the present disclosure, a ceramic waveguide filter forming a plurality of resonant blocks including a ceramic dielectric is provided, including an input end and an output end each defined by a groove-shaped portion having a predetermined depth on an outer surface of the ceramic waveguide filter, a plurality of resonators each defined by a groove-shaped portion having a predetermined depth on an outer surface of each of the plurality of resonant blocks, and at least one ultra-short delay adjusters adjacent to at least one of the input end and the output end, the ultra-short delay adjuster being defined by a groove-shaped portion having a predetermined depth on the outer surface of the ceramic waveguide filter.

The application provides a millimeter wave rectangular waveguide embedded gap waveguide filter, which comprises, from top to bottom, an upper metal cover plate, an intermediate metal block and a lower metal cover plate; the upper metal cover plate is provided with a coaxial input port; the lower metal cover plate is provided with a coaxial output port; the upper surface and the lower surface of the intermediate metal block are provided with a first periodic metal pin array and a second periodic metal pin array; the first periodic metal pin array and the second periodic metal pin array are respectively provided with a gap between the upper metal cover plate and the lower metal cover plate; the first periodic metal pin array surrounds a first slot gap waveguide resonant cavity on the upper surface of the intermediate metal block; the second periodic metal pin array surrounds a second slot gap waveguide resonant cavity on the lower surface of the intermediate metal block; a rectangular waveguide resonant cavity formed by hollowing out the inside of the intermediate metal block is in communication with the first slot gap waveguide resonant cavity and the second slot gap waveguide resonant cavity respectively.

The invention provides a low-sidelobe waveguide filtering slot array antenna for 5G millimeter waves and a working method, and belongs to the field of communication systems. The antenna is formed by sequentially connecting an input port, a pre-stage filtering resonator group and a final-stage composite resonator in series. The front-stage filtering resonator group consists of two rectangular waveguide resonant cavities; a plurality of rectangular radiation slots are formed in the surface of the top of the final-stage composite resonator to form a radiation array, and the cavity serves as a final-stage resonance unit of the filter at the same time, so that deep integration of a filtering function and a radiation function is achieved. According to the invention, the final-stage filtering resonant cavity and the radiation slot are integrally designed, so that the cascading loss is eliminated, and the system efficiency is remarkably improved; the gap offset is accurately controlled by using a Taylor synthesis method, and a low side lobe level of-20 dB is realized; and a 3D printing process is adopted, so that the low-cost manufacturing problem of a complex structure is solved. The invention is suitable for 5G millimeter wave devices in the frequency band of 28 GHz, and has the advantages of high integration level, high performance and good manufacturability.

Provided herein are various enhancements for aperture antenna arrays and electronically steered arrays (ESAs). A modular subarray is provided that includes horn apertures coupled to corresponding waveguide polarizers coupled to transmit waveguide filters and receive waveguide filters that establish transmit ports and receive ports. The transmit ports and the receive ports are coupled through a waveguide adapter plate to individual isolation cavities each formed in a body of an amplifier-filter module that houses amplifier / filter elements and couple transmit radio frequency signaling and receive radio frequency signaling to coaxial connections penetrating the isolation cavities. The subarray also includes a circuit card assembly comprising the coaxial connections coupled to stripline links formed by a printed circuit board, wherein the stripline links couple to beamforming circuitry, and a high-density digital connector mounted to the circuit card assembly and configured to carry input / output radio frequency signaling for the subarray to / from the beamforming circuitry.

The invention belongs to the technical field of filter antenna manufacturing and surface treatment, and particularly relates to an integrated manufacturing method of a high-precision multi-cavity millimeter wave waveguide filter antenna. Firstly, a resin waveguide device is manufactured by adopting a photocuring (SLA) 3D printing method, and metallization is performed in combination with a chemical copper plating technology. Precise dimensional precision parts are obtained through high-precision non-metal printing, an optimized chemical plating process is combined, a compact, uniform and smooth copper plating layer with low surface roughness is formed, skin effect loss under the 28GHz frequency band is effectively reduced, and the performance of a filter is improved.

The application provides a gap waveguide filter based on a stub ring resonator and a cavity resonator, which comprises, from top to bottom, a magnetic field closed structure, a microstrip resonant structure, an artificial magnetic conductor and a cavity resonator which are stacked in sequence; the microstrip resonant structure comprises a stub ring resonator on the upper surface of the second dielectric plate; and the cavity resonator is located at the center position of the artificial magnetic conductor of the periodic structure. The number of transmission zeros of the filter is increased by the stub ring resonator in the microstrip resonant structure and the cavity resonator arranged at the center position of the artificial magnetic conductor, so that the stopband range is widened and the stopband suppression level is strengthened, and the out-of-band selectivity of the gap waveguide filter is effectively improved.

The invention discloses a compact millimeter wave power synthesis network system with high power capacity and an implementation method. The implementation method comprises the following steps: step S1, equally dividing a low-power signal into four paths through a first-stage micro-strip power divider; s2, respectively inputting the four paths of low-power millimeter wave signals into four independent amplification channels of a second-stage power amplifier for synchronous power amplification; s3, performing space power synthesis on the four paths of high-power millimeter wave signals through a third-stage waveguide power combiner; and S4, carrying out stray and harmonic suppression on the synthesized high-power millimeter wave signal through a fourth-stage waveguide filter, and outputting a high-purity millimeter wave high-power signal. The whole power synthesis network integrates the micro-strip power divider, the power amplifier, the waveguide power combiner, the filter and the like, the space utilization rate is high, and the whole structure is very compact. The waveguide power combiner can bear a high-power signal synthesized by a power amplifier, and has relatively low transmission loss.

The invention discloses a broadband high-pass filter based on a city-wall-like waveguide, and relates to the technical field of optical devices. The invention relates to an ultra-wideband waveguide filter, which comprises a substrate layer, a metal layer, an incident waveguide, five battlement-shaped waveguides, five rectangular cavities and an emergent waveguide, all the components are arranged according to a specific symmetric relationship, a core component adopts a unified nanoscale size design and is filled with air, the metal layer is silver, and the substrate layer is silicon dioxide. According to the filter, light with the wavelength of 280-650 nm is hindered (the transmittance is smaller than 0.02) and light with the wavelength of 820-3000 nm is made to pass smoothly (the transmittance is larger than 0.8) through the synergistic effect of the wall-like waveguide and the rectangular cavity by utilizing the polariton characteristics of surface plasmons, and broadband high-pass filtering is achieved. The MIM waveguide filter is simple in structure and small in size, solves the problem that an existing MIM waveguide filter is difficult to achieve broadband high-pass filtering, and is suitable for the field of integrated optical devices.

The invention discloses a miniaturized wide-stop-band substrate integrated ridge waveguide filter crossing device, which belongs to the technical field of microwave communication, and comprises a first metal layer, a second metal layer, a third metal layer, a first dielectric substrate, a second dielectric substrate and a third dielectric substrate, and the first metal layer is provided with an input / output port. The first dielectric substrate is located between the first metal layer and the second dielectric substrate; the second dielectric substrate is a bonding layer and is located between the first dielectric substrate and the second metal layer; the third dielectric substrate is arranged between the second metal layer and the third metal layer; four single-mode single-ridge substrate integrated ridge waveguide resonant cavities and a dual-mode multi-ridge substrate integrated ridge waveguide resonant cavity are designed based on the first metal layer. And cross transmission and wide stop band characteristics are realized by using a center feed technology, a harmonic interleaving technology and an orthogonal degenerate mode in the fifth resonant cavity.

The invention designs a patch stacked substrate integrated waveguide filtering antenna by utilizing a substrate integrated waveguide structure. The antenna is characterized by comprising a dielectric substrate, an SIW resonant cavity, a ground plane, a radiation patch, a parasitic patch and a lens, the feed structure microstrip line is attached to the bottom of the lowermost dielectric substrate; the SIW resonant cavity and the microstrip line transition adopt a coplanar waveguide structure; the metal ground plane is located on the upper layer of the resonant cavity, and a rectangular groove is etched in the center; and the patch is positioned on the second layer of dielectric substrate and consists of a central square radiation patch and parasitic patches at four corners. According to the antenna, on the basis of an SIW resonant cavity, a rectangular radiation patch is used to generate a high-frequency radiation zero point; the four parasitic patches are loaded, low-frequency radiation zero points are generated at the same time, and the filtering effect is improved. And finally, the position of the parasitic patch is adjusted, a lens is added, two gain bandwidths are combined, and the inhibition depth of the antenna is reduced to be below 20dB. The antenna works in a V wave band and has an application prospect in the field of satellite communication.

The utility model discloses a KU wave band band-pass waveguide filter comprising a lower seat which is internally provided with a ripple filtering groove penetrating through two sides; the upper cover is buckled at the top of the lower seat and is fixed, so that the corrugated filtering grooves are encircled to form a single filtering channel; the input end is arranged at one end of the filtering channel; the output end is arranged at the other end of the filtering channel, and the filtering channel can be communicated end to end under the action of the input end and the output end; the impedance transformer is arranged at the input end of the filtering channel; the impedance transformer comprises at least two right-angle bosses formed on one side wall of the lower seat. According to the KU wave band band-pass waveguide filter provided by the utility model, through the arrangement of the lower seat and the upper cover, a single filtering channel can be formed between the input end and the output end, and the inner side plane of the upper cover is attached to the top of the lower seat for assembly, so that the filtering channel can be formed, and meanwhile, the overall size can be reduced.

The invention belongs to the field of radio frequency microwaves, and discloses a millimeter wave passive element based on an SSPP structure and a satellite duplex communication device, comprising an input waveguide port, a waveguide power divider, a waveguide filter and an output waveguide port which are connected in sequence, the input waveguide port is used for inputting electromagnetic energy; the waveguide power divider is used for receiving electromagnetic energy and equally dividing the electromagnetic energy into two paths of electromagnetic waves; the waveguide filter is used for carrying out frequency selection on the two paths of electromagnetic waves respectively to obtain an electromagnetic signal of a K wave band and an electromagnetic signal of a Ka wave band; the waveguide filter is a waveguide filter loaded with an SSPP structure; the output power of the electromagnetic signal of the K-band and the output power of the electromagnetic signal of the Ka-band are the same; the number of the output waveguide ports is two, and the two output waveguide ports are respectively used for outputting electromagnetic signals of a K wave band and electromagnetic signals of a Ka wave band. According to the invention, the functions of transmitting, receiving, filtering and power dividing of signals can be realized in a millimeter wave frequency band, and the antenna has the advantages of high power capacity, low loss and good isolation.

The invention discloses a frequency multiplexing spectrum analysis chip based on a modulator array. The frequency multiplexing spectrum analysis chip comprises an input end main waveguide, a filter array, an intensity modulator array, a total beam combiner and an optical detector. According to the scheme, a low-correlation transmission matrix is constructed through a filter array, transmission spectrums of all channels are different, and a broadband is covered. Periodic intensity modulation is applied to the light passing through the filter at different frequencies, and the modulated light intensity is combined. The intensity of each frequency channel can be obtained by carrying out demodulation processes such as Fourier transform on the collected time sequence optical signals, spectrum reconstruction is carried out by utilizing an intensity sequence and a corresponding measurement matrix, and spectrum information of an incident end can be restored.

The invention provides a miniaturized shielding type substrate integrated waveguide filter for millimeter wave communication, which comprises a filtering resonance structure, a dielectric substrate, a top metal layer, a bottom metal layer and an EMSIW arc resonant cavity, the interstage coupling structure is arranged on the top metal layer between the adjacent resonant cavities; the feed conversion structure is arranged on the top metal layer; the bottom grounding shielding structure is arranged at the bottom of the bottom metal layer; and the shielding structure is packaged at the top and is fixedly connected in a press fit manner, so that the filter forms an integral laminated structure in sequence from top to bottom in the longitudinal direction to reduce radiation loss. An EMSIW arc resonant cavity structure is adopted, the structure is compact and easy to integrate, the width is smaller than half wavelength, the size of the filter can be effectively reduced, and the filter is suitable for a millimeter wave large-scale MIMO antenna array; meanwhile, steep out-of-band rejection is obtained through the four-order resonance structure, and the high rejection requirement of a 5G communication system for out-of-band interference can be met.