95 results about "Switched filters" patented technology

The invention discloses a 3D printing alloy powder filtering device and a filtering assembly, and relates to the technical field of powder treatment for metal additive materials, the 3D printing alloy powder filtering device comprises a self-treatment assembly, the self-treatment assembly comprises a box body, two material pipes are symmetrically and fixedly connected to the box body, a rotating disc is rotatably connected to the inner side wall of the box body, and four first through holes are formed in the rotating disc in an annular array mode; a second through hole is formed in the circle center position of the rotating disc, a filter screen is arranged in each of the four first through holes of the rotating disc, a first servo motor is fixedly connected to the bottom of the inner wall of the box body, and the first servo motor is sleeved with a protective pipe; the operation of the self-processing assembly breaks through the efficiency bottleneck of a traditional filtering device from the two aspects of blockage prevention and quick blockage removal through dynamic switching of a filter screen and an active screen cleaning mechanism, the filtering quality of the alloy powder is guaranteed, the production efficiency is remarkably improved through continuous operation and automatic screen cleaning, and the self-processing assembly has both practicability and innovativeness.

A tracker module is provided with a reduced size. The exemplary tracker module includes a module laminate, an IC chip, and a filter circuit. The IC chip is disposed on the module laminate. The IC chip includes at least one switch included in a supply modulator. The filter circuit includes variable reactance elements whose reactance is varied. The variable reactance elements include at least one reactance element and at least one switch. The at least one switch of the variable reactance elements in the filter circuit is integrated in the IC chip.

The application discloses a detector filter device capable of automatically switching filters and belongs to the technical field of pesticide residue detection. The detector filter device capable of automatically switching filters comprises a filter shell, the filter shell is a hollow structure, circular through holes are formed in the upper side and the lower side of the filter shell in a corresponding manner, a lens is mounted in the circular through hole in the lower side, an adjusting rotating shaft is vertically arranged at the center of the inside of the filter shell, bearings are fixed at the centers of the upper side and the lower side of the filter shell, and the outer wall of the filter shell is fixed with symmetrically arranged first filter structure and second filter structure. The first filter structure and the second filter structure can realize quick switching of two filters, and the surface can be automatically cleaned during the switching process, so that the filter effect is guaranteed. The detector contains two filters, the two filters can be switched according to needs in one detector, the cost is reduced, the detection items of a single detector are increased, the difficulty of not leaking light is overcome, and the utilization rate of the detector is improved.

Provided is a multiplexer capable of transmitting signals of two frequency bands having a small frequency gap at the same time in a wave-divisible manner. A multiplexer (1) is provided with filters (10, 20) connected to a common terminal (100). The filter (10) is provided with: series arm resonators (s11-s15) disposed in a first series arm path; and a first variable capacitance circuit connected in parallel to the series arm resonator (s11) closest to the common terminal (100), the first variable capacitance circuit having a capacitor (31) and a switch (41) connected in series with each other, the filter (20) being provided with: parallel arm resonators (p21 and p22) connected between the second series arm path and ground; and a second variable capacitance circuit connected in series to the parallel arm resonator (p21) closest to the common terminal (100), the second variable capacitance circuit having a capacitor (32) and a switch (42) connected in parallel to each other.

The application discloses a multi-octave wideband frequency conversion assembly, which comprises a frequency conversion circuit, an amplitude control circuit and a switch filter set, wherein the frequency conversion circuit expands the input radio frequency to an intermediate frequency signal through two local oscillator frequency points for the input radio frequency signal and outputs the intermediate frequency signal to the amplitude control circuit; the amplitude control circuit adjusts the amplitude of the intermediate frequency signal output by the frequency conversion circuit; the switch filter set filters the signal output by the amplitude control circuit through a multi-path filter set, filters out harmonics and stray signals, and performs amplitude correction to obtain a multi-octave intermediate frequency output signal. The 3-4GHz signal is expanded to a ten-octave signal of 0.2-2GHz which can be directly processed by a digital circuit through the two local oscillator frequency points of 4 / 5GHz, the output power reaches 10dBm, the harmonic suppression reaches more than 48dBc, the power flatness reaches ±1dB, the dynamic range reaches more than 60dB, and the step is only 0.25dB.

A distributed ice melting device topological structure suitable for an ultra-high voltage power transmission line comprises a plurality of ice melting sub-modules arranged in a distributed mode, and each ice melting sub-module comprises a single-turn coupling transformer, a metal oxide voltage limiter, a bypass switch, a filter, an H-bridge current converter and a direct-current capacitor. A primary winding of the single-turn coupling transformer is directly formed by split sub-conductors of the ultra-high voltage power transmission line, and a secondary winding of the single-turn coupling transformer is electrically connected with other parts of the ice melting sub-modules, so that the ice melting sub-modules are connected in series on the split sub-conductors of the power transmission line in a distributed manner; the H-bridge current converter is electrically connected with the direct-current capacitor, and the direct-current capacitor provides smooth direct-current voltage for the H-bridge current converter; the filter is connected in series with the H-bridge current converter, the bypass switch is connected in parallel with the H-bridge current converter, and the metal oxide voltage limiter is connected in parallel with the line side output end of the ice melting sub-module; and the ice melting sub-modules adjust the current of the corresponding split sub-conductors by changing the equivalent impedance of the ice melting sub-modules, so that accurate ice melting of the ice-coated split sub-conductors is realized, and the overall current and the transmission power of the power transmission line are kept unchanged. The technical problem to be solved by the invention is to provide the distributed ice melting device topological structure suitable for the ultra-high voltage power transmission line, and the technical problem that the existing ice melting technology cannot realize accurate ice melting and non-power-cut operation on an ice coating section on the ultra-high voltage power transmission line is solved. And normal transmission of the line is affected due to overlarge capacity demand, line overcurrent or incapability of three-phase synchronous ice melting.

The application discloses a kind of semi-integrated miniaturized LC filter, preparation method and switch filter group, the LC filter includes ceramic substrate, ceramic substrate is made of top layer, middle layer and bottom layer, wherein multiple capacitors are integrated in ceramic substrate middle layer by LTCC process, pad is provided on the surface of ceramic substrate top layer, multiple inductors are welded on pad;All inductors form the required circuit connection by pad and capacitor, rectangular pad is respectively provided at the left and right ends of ceramic substrate bottom layer, used as the input, output port of LC filter signal, ground pad is provided between the two rectangular pads of ceramic substrate bottom layer, to ensure that LC filter is well grounded.The capacitor is integrated in ceramic substrate in the application, the space occupied by the separated capacitor is saved, and the process is simpler than the process of semi-integrated LC filter and IPD process designed chip LC filter;Small volume separated inductor is used instead of integrated inductor, which can improve the Q value of the filter and reduce the loss.

The utility model relates to the technical field of chocolate production and processing, in particular to a filter sieve for chocolate production, which comprises a barrel body, the top and the periphery of the barrel body are respectively provided with a feed hopper and an open slot which are communicated with an internal cavity, and a turntable and a vibrating piece are arranged in the cavity of the barrel body. A plurality of filter screens with different mesh numbers are arranged on the turntable; wherein the rotating disc can switch the filter screen through a positioning structure, the filter screen and the feeding hopper are correspondingly arranged, the filter screen and the rotating disc are detachably connected, and through the arrangement of the positioning structure, on one hand, a connecting rod connected with the rotating disc can be limited and fixed, and on the other hand, the connecting rod can be detachably connected with the rotating disc; and on the other hand, the rotating disc can be driven to switch the filter screens by adjusting the rotating mode of the connecting rod, so that the filter screens with different mesh numbers correspond to the feeding hopper, and the rotating disc can be disassembled by pressing the telescopic column ends of the positioning glass beads after long-time use.

The utility model discloses a one key presses and switches filter material's water outlet device, including the body that is equipped with the water passing cavity and the water outlet, and the water passing cavity is connected with the water outlet, is equipped with the ejection assembly in the body, and it can axial movement and has the cavity of placing filter material. Ejection assembly realizes the cavity switching in the body through the cooperation of the guide column and the undulating guide groove, and in combination with spring reset and one -way valve check structure ensures that the operation is convenient and safe. The utility model discloses through pressing quick replacement filter material, simplifies the operation step, prevents water flow splashing, optimizes water flow path to fully flush filter material, is applicable to carbonic acid spring wash head and a variety of scenes, has remarkable technical advantage and market application prospect.

The utility model discloses a double-filter-screen circulating sewage pump which comprises a main body mechanism. The main body mechanism comprises a sewage pump main body, a water outlet pipe installed on one side of the sewage pump main body, a water inlet pipe installed on the other side of the sewage pump main body, a four-way shell symmetrically fixed to the top end of the sewage pump main body, a control base rotationally arranged in an inner cavity of the four-way shell, and a servo motor installed at the top end of the four-way shell and connected with the control base through a shaft. The four-way shells are symmetrically arranged on the two sides of the sewage pump body, the filtering pieces are symmetrically arranged between the opposite four-way shells and communicate with the four-way shells on the two sides, the sewage discharge pipe is installed on the four-way shell on one side, and the water diversion piece is installed on the four-way shell on the other side and communicates with the water outlet pipe. The double-filter-screen circulating sewage pump has the advantages that the double-filter-screen circulating switching filtering is achieved, and the filter screens are automatically cleaned.

The utility model discloses a power line conduction emission environment noise testing device. The device comprises a metal box, a passive load module and a fan heat dissipation module. The passive load module is arranged on the upper portion in the metal box, the fan heat dissipation module is arranged on the lower portion in the metal box, and the passive load module and the fan heat dissipation module are separated through a metal partition plate. The passive load module comprises a first connector, an air switch, a plurality of mechanical voltmeters and a plurality of RLC circuits. The fan heat dissipation module comprises a second connector, a switch, a filter and an electric fan. The load has resistance characteristics, capacitive reactance and inductive reactance effects, the impedance of the load can be adjusted, environmental noise under different load impedances can be detected, whether the environmental noise of a laboratory meets the standard test requirement or not can be effectively detected, the test mode is closer to the test mode of a tested product, the test result is more accurate, and the test efficiency is improved. And the interference of environmental noise on the test of the tested product can be eliminated.

The present application relates to river filtering technical field, especially a kind of rotating filter screen with electric control translation mechanism, including the top beam of being installed in the upper end opening of river and the bottom limit frame of being fixed in river bottom, top beam lower end is fixedly equipped with the upper translation guide rail.The rotating filter screen with electric control translation mechanism of the present application can be switched according to the scene needs by adopting double-section structure design, so that its applicable scene greatly improves;By using electric control translation and overturning adjustment mode, the angle and position of rotating filter screen can be controlled, and the operation is more convenient;By using the design of top beam and bottom limit frame, the impact resistance of the entire rotating filter screen can be enhanced, and the structure is more stable;Rotating filter screen can be quickly attached on both sides of river by splitting, not only can switch filtering mode, but also can change the barrier inside main river, facilitate internal ecology, improve different application scenarios.

The invention discloses a single-pole double-throw switch filtering assembly based on an LTCC (Low Temperature Co-Fired Ceramic) technology. A switching circuit and an LTCC resonator are integrated, and the on-off state of a switching diode in the working process is controlled by an externally applied direct current bias voltage. When the diode is in a conducting state, the parasitic inductor and the capacitor form series resonance, and the equivalent coupling admittance converter passing through the resonator can be inverted and equivalent to an open circuit, so that a branch signal is cut off, and channel isolation is realized; and when the diode is in a closed state, the electromagnetic field distribution of the substrate integrated waveguide resonator is not obviously influenced, the filter keeps normal work, and signal passband transmission is realized. According to the structure, on one hand, the SIW waveguide integration form is used for achieving the low insertion loss characteristic; and on the other hand, the stop-band suppression degree is effectively improved by introducing the cross coupling topology. The whole circuit has the advantages of being compact in structure, low in loss, high in isolation degree, excellent in out-of-band rejection performance and the like, and the requirements of 5G and future high-speed wireless communication systems can be met.

The utility model relates to the technical field of water mist fire extinguishing devices, and discloses a high-pressure water mist fire extinguishing device which comprises a rack, a high-pressure pump set is fixedly mounted on the rack, and a control cabinet is fixedly mounted at the top of the rack; and the switching filtering mechanism is arranged at the water inlet end of the high-pressure pump set, and the switching filtering mechanism is used for automatically switching the filtering structure. Through the design of the ultrasonic flow meter, the flow of water entering the high-pressure pump set can be monitored, when the flow of the water is low, it is indicated that too many impurities are attached to the barrel-shaped filtering piece, and then the first electric valve pipelines corresponding to the barrel-shaped filtering piece are controlled to be closed completely; and then all second electric valve pipelines are opened, water used by the high-pressure pump set is filtered with the help of the other barrel-shaped filtering piece, the water filtering efficiency is guaranteed, the problem that fire extinguishing work is greatly affected due to the fact that the water flow is reduced is solved, and the safety of the structure in use is improved.

A wind power grid impact damping suppression method based on branch and bound and knapsack optimization control can realize efficient and rapid suppression of wind power fluctuation. The device is characterized by combining the advantages of thyristor switched filter (TSF) and active power filter (APF), and developing active damping generator technology based on knapsack optimization control for wind power grid impact suppression. The developed ADG technology has the following advantages: ① It has the characteristics of TSF harmonic impact suppression, voltage mutation and high cost performance; ② It has the characteristics of APF output damping continuous adjustable and high precision; ③ Based on branch and bound, the wind power impact is classified as the reference of the maximum damping of ADG output, which effectively improves the rapidity and stability of ADG response; ④ The knapsack problem (UKP) is used to realize the optimal switching control of ADG, which meets the minimum cost and efficient wind power disturbance impact suppression.

The utility model discloses a filter box for defoaming agent production, which comprises a base, one side of the top of the base is fixedly connected with a feed liquid box, one end of the feed liquid box is connected with a switching filter mechanism, the switching filter mechanism comprises a liquid delivery pump, the output end of the liquid delivery pump is connected with a switching seat, the end part of the switching seat is connected with two connecting pipes, and the two connecting pipes are connected with the switching seat. The end parts of the two connecting pipes are fixedly connected with box bodies, and top covers are arranged at the tops of the two box bodies. According to the filter box for defoaming agent production, the hand wheel is rotated to drive the two valve plates to block the original working connecting pipe and open the other idle connecting pipe, the flow direction of feed liquid is switched and changed, the feed liquid is fed into the idle box body from the original working box body through the liquid feeding pump, the filter plate is taken out from the original working box body through the lifting handle, and the filter plate is taken out through the lifting handle. The filter plate is cleaned and replaced without shutdown, and the feed liquid can be continuously filtered, so that the production efficiency can be effectively improved.

The invention discloses an anti-interference receiver and a radar system thereof. The anti-interference receiver comprises a numerical control attenuator module, a pre-amplifier module, a switch, a filter and a post-amplifier module which are connected in sequence, wherein the numerical control attenuator module is used for automatic gain control; the post-stage amplifier module comprises at least one post-stage amplifier, and the post-stage amplifier is a GaAs HBT (Heterojunction Bipolar Transistor) amplifier. According to the invention, the anti-interference capability of the receiver to in-band interference can be fundamentally improved, the linear working state can be rapidly recovered, and stable operation of a radar system is ensured. Meanwhile, the dynamic range of the receiver is expanded, so that the receiver can adapt to various interference conditions in a complex electromagnetic environment.

The invention discloses a method for fusing a microwave and millimeter wave monolithic integrated switch and a filter, which is characterized in that when the method is used for fusing a single-pole double-throw switch and a band-pass filter, two parallel channels are connected between a signal input end and a signal output end; the first channel comprises a switching circuit, a first capacitance-inductance tuning unit, a first filter and a second capacitance-inductance tuning unit which are connected in series; the second channel comprises a switching circuit, a third capacitance-inductance tuning unit, a second filter and a fourth capacitance-inductance tuning unit which are connected in series, and the four capacitance-inductance tuning units have the same structure; the capacitance-inductance tuning unit is cascaded between the switch and the band-pass filter, and the capacitance is integrated into the design of the switch, so that the frequency band of the switch is widened; a parasitic capacitor and a capacitance and inductance tuning unit existing in the switch are integrated into the design of the band-pass filter, so that the insertion loss, the return loss and the out-of-band rejection of the switch filter bank after integral cascade connection are improved.

This invention relates to the field of power system technology and discloses a method, system, equipment, and medium for line power flow regulation in power systems. The method involves collecting operational data of the power system after the integration of renewable energy equipment to predict the target value of reactive power demand. When this value falls within the regulation capacity range of reactive power flow regulation equipment, including bypass switches, LC filters, H-bridge converters, and DC capacitors, multiple target devices are determined based on the capacity margin of the equipment and its electrical distance from the renewable energy equipment. A quadratic programming model is constructed and solved based on the target value of reactive power demand to obtain the output strategy of the target devices, which is then sent to the corresponding target devices to control the line power flow through decoupling control technology. The regulation results are verified; if the verification fails, the target value of reactive power demand is incrementally corrected, and the strategy is re-solved until the final verification is successful, thereby achieving effective regulation of line power flow in the power system.

The utility model discloses a kind of double filter element devices of three valve control positive and negative washing, it is related to filter relevant technical field.The utility model includes two groups of symmetrically arranged shell;The inside of shell is provided with filter element, and the both ends of filter element pass through towards the two port positions of shell, and the both end surfaces of shell are provided with the sealing cover of sleeve joint in the both end positions of filter element, and three-way valve one is set between the sealing cover above shell, and the both port of three-way valve one is connected with the sealing cover port of similarity by spiral pipe and is screwed, and three-way valve two is set between the both sealing cover below shell, and the lower part of position between two groups of shell is provided with backflush pipe, and the port position of backflush pipe is connected with on-off valve.The utility model is used in cooperation with three-way valve one, three-way valve two and on-off valve, cooperates three-way valve control, so that backwash liquid enters two groups of filter element simultaneously, significantly improves cleaning efficiency, simultaneously realizes switching filter / backflush mode, and simplifies operation.

The invention discloses a multichannel transceiver device for scatter communication, and relates to the technical field of wireless communication. The device adopts a highly integrated design, and integrates four transmitting up-conversion channels and four receiving down-conversion channels. Comprising a switch filter bank, an amplifier, a filter, a radio frequency switch, a mixer, a circulator and the like. The transmitting channel upconverts the intermediate frequency signal to a radio frequency band through filtering amplification and frequency mixing; the receiving channel realizes transmit-receive isolation through a circulator, and converts a radio frequency signal into an intermediate frequency signal through low noise amplification and down-conversion processing. The device adopts a TDD (Time Division Duplex) mode, realizes receiving and transmitting time-sharing switching through a radio frequency switch group, and adopts a numerical control phase shifter to optimize amplitude and phase consistency among multiple channels. The device has the advantages of high integration level, good isolation performance, high switching speed and the like, supports beam forming and channel backup functions, and is suitable for wireless communication scenes such as scatter communication and the like.

The utility model discloses a liquid filter free of consumable replacement, which comprises a total filter unit arranged in a machine body, the total filter unit is composed of a plurality of unit filter bags, the unit filter bags are arranged and combined regularly, and filter cloth covers the outer sides of the unit filter bags; each unit filter bag is formed by splicing at least two groups of filter screen discs, a central supporting pipe is arranged in the middle of each unit filter bag, the central supporting pipe is a water inlet and outlet flow channel, and the filter screen discs are communicated with the central supporting pipe; during filtering, water flow presses the filter screen disc to be closed, and filtrate flows out from the central supporting pipe; and during backwashing, water flows inwards from the central supporting pipe, and the filter screen disc is opened outwards. When filtering and backwashing are switched, the filter screen disc can swing back and forth, certain vibration is formed, filter residues accumulated on filter cloth are shaken off, and the filtering effect is improved.

A duplex seawater filter comprises: a filter tank including a first filter tank and a second filter tank which are arranged side by side left and right; the connecting pipe body is arranged between the upper part of the first filtering tank and the upper part of the second filtering tank and is respectively connected with the first filtering tank and the second filtering tank; the valve is arranged in the connecting pipe body; and the handle is arranged on one side outside the connecting pipe body and is connected with the valve. The duplex seawater filter disclosed by the utility model is reasonable in design, can effectively remove impurities and particulate matters in water, and can simply and conveniently clean or maintain one of the filter tanks under the condition of not stopping the operation of a seawater system, so that the continuous operation of the seawater system of a ship is ensured, and the service life of the ship is prolonged. Due to the design of the handle, the filter tanks can be simply and quickly switched, the filter tanks can be quickly opened through the rotary openable cover to be cleaned or replaced, and the corrosion resistance is good.

The utility model provides a switch filter bank. The switch filter bank comprises a first switch, a first filter bank, a second switch, a third switch, a second filter bank and a fourth switch which are connected in sequence, the first filter bank comprises a first filter, a second filter, a third filter, a fourth filter and a fifth filter which are connected in parallel; the second filter bank comprises a sixth filter, a seventh filter, an eighth filter, a ninth filter and a tenth filter which are connected in parallel. The first switch, the second switch, the third switch and the fourth switch are all single-pole five-throw switches. According to the utility model, accurate frequency point output is obtained by cascading the two groups of filters and switching the switches, the requirements of distribution of the frequency points and segmentation of the filters are met, and only the switches of one switch filter group need to be switched when adjacent frequency points are output in the scheme. Meanwhile, the switching filter bank is designed by utilizing the scheme, and the use passband of the filter bank can be changed by changing the frequency band of one of the filter banks.

The utility model relates to the technical field of filters, in particular to a duplex switching filter capable of backwashing, which comprises two cylinders, two connecting pipes, a three-way ball valve, a metal filter element and a cleaning component, the cylinders are arranged in parallel, the two connecting pipes which are arranged in parallel up and down are connected onto the cylinders, the connecting pipes on the two cylinders are connected with the three-way ball valve, and the metal filter element is connected with the cleaning component through the three-way ball valve. The number of the metal filter elements corresponds to that of the cylinders, the metal filter elements are installed in the cylinders, and the cleaning assembly is connected to the metal filter elements and comprises a guide rod, a sliding seat, a cleaning scraping ring and a guide wing plate. According to the utility model, the cleaning assembly capable of cleaning the metal filter element is arranged, so that the reverse wing plate and the cleaning scraping ring can be driven to move to clean the outer wall of the metal filter element through the flowing of water flow during the backwashing of the water flow; and the spiral blades arranged in the metal filter element can also convert the liquid from axial flow to high-speed rotational flow, so that the cleaning effect is enhanced.

The invention relates to a miniaturized low-power-consumption high-isolation millimeter wave channel module, which belongs to the technical field of communication, and comprises a multi-layer vertical interconnection structure, the multi-layer vertical interconnection structure comprises a layer A, a layer B and a layer C from top to bottom, the layer A is a millimeter wave high-frequency layer, the layer B is a control, crystal oscillator and low-frequency layer, and the layer C is a power supply layer; the multifunctional transceiving chip is integrated on the layer A and integrates a switch, a filter, a frequency mixer, a driving amplifier, a low-noise amplifier and a frequency multiplier of a millimeter wave link on a single chip; the local oscillator modulation circuit is arranged on the layer B, adopts an asynchronous time division modulation mode, and realizes the opening or closing of a local oscillator amplifier and a frequency mixer through an NMOS switch and FPGA control logic; and the 32-path filter bank and the two power dividers are arranged on the B layer. Complex interconnection and layout in equipment are realized, the isolation degree of a channel circuit is greatly improved, the power consumption of a product is reduced, and the size of the product is greatly reduced.

The present application relates to water body purification equipment field, a kind of multistage purification equipment for black and odorous water treatment, including multiple purification groups, purification group includes sewage input pipe and sewage output pipe, multistage purification structure is connected between sewage input pipe and sewage output pipe, the output end of sewage input pipe is equipped with independent output pipe and total output pipe by tee solenoid valve;Multistage purification structure includes sealed shell, rotationally connected with adjusting disc in sealed shell, matched with servo motor of adjusting disc is installed on sealed shell, adjusting disc is equipped with multiple evenly distributed mounting holes, filter core is installed in mounting hole;The upper and lower ends of sealed shell are respectively equipped with auxiliary unloading structure and unloading structure matched with filter core;Realize the function switching of single filter core, multiple filter cores filtering simultaneously or multistage filter core step-by-step filtering according to the need of purification work, and monitor output water quality in purification process, so as to quickly switch filter core with reduced filtering effect, and filter core unloading process is automatically carried out.

A power converter comprises a transformer having a primary winding and a secondary winding, a first switch coupled with the secondary winding, a filter circuit coupled with the first switch and comprising a resistor-capacitor (RC) filter coupled in series with a second switch, and a switch controller. The switch controller is coupled with the first switch and the filter circuit and configured to sense a voltage across the first switch, compare the voltage across the first switch with a voltage threshold, and control a gate of the first switch and a gate of the second switch in response to the comparison of the voltage.

The invention provides a multi-zero filter, a preparation method and a switch filter module, and relates to the technical field of filters, the multi-zero filter comprises a filter body and a first microstrip line, the first microstrip line is arranged on the upper surface of the filter body, and the first microstrip line and a second microstrip line in the filter body form a multi-path coupling topology. Compared with the mode of increasing the resonator spacing or adding a coupling structure in the filter in the prior art, the first microstrip line is additionally arranged on the upper surface of the filter body, complex coupling topology is achieved in a finite layer, a physical layer does not need to be newly added, or the area does not need to be greatly increased, a new zero point does not need to be introduced, and the out-of-band rejection capacity is improved.