196results about How to "Improve isolation" patented technology

The invention discloses a directional diagram reconfigurable antenna capable of switching feed through an MEMS switch, and belongs to the field of radio frequency front-end devices. The directional diagram reconfigurable antenna is composed of a micro-strip radiation unit, a guide parasitic unit, a composite beam ohmic contact type MEMS switch, a one-to-four feed network, a direct current bias line, a test patch bonding pad, a coplanar waveguide, a gradual change micro-strip line, a dielectric substrate and a metal ground backboard. The two-stage MEMS switches are erected on the one-to-four feed network, when the two-stage switches on a certain feeder line are turned on, radio frequency current can flow to the corresponding basic radiation unit through the feeder line to generate an inclined beam facing the quadrant, and the two basic radiation units on the front side can be enabled by simultaneously turning on the four switches on the front side to generate an inclined beam facing the quadrant. And generating an inclined beam in the front side positive direction. The antenna adopts a single-layer board design, the dielectric substrate does not need to be punched, the structure is simple, manufacturing is convenient, the adopted MEMS switch is small in loss and high in isolation degree, and rapid printing and manufacturing can be achieved through the surface etching process.

The invention discloses a millimeter wave polarization and directional diagram reconfigurable antenna, and belongs to the field of radio frequency front-end devices. The antenna is composed of symmetrical rectangular radiation patches, and a semicircular defect, a quarter circle defect, a rectangular branch load, an orthogonal bidirectional feed network, a T-shaped power dividing feed network, a composite beam ohmic contact type MEMS switch, a direct current bias line, a test patch bonding pad, a coplanar waveguide, a gradient matching structure, a dielectric substrate and a metal ground backboard which are located on the radiation patches. When the single-side MEMS switch on the T-shaped power dividing feed network is switched on, energy flows to the radiation unit on the side, and the leftward or rightward wave beam inclination effect can be achieved. When the MEMS on the two sides are both switched on, the radiation pattern points to the Z positive axis, no beam deflection exists, and therefore the pattern reconfigurable function in the left direction, the middle direction and the right direction can be achieved. When a switch on the orthogonal bidirectional feed network is closed, the size of the long line can realize 90-degree phase delay, and two orthogonal degenerate modes are synthesized into a circularly polarized wave to cover a complete half-power beam width.

The invention provides a low-noise amplifier and a radio frequency front-end module, and the low-noise amplifier comprises an input matching circuit, a first-stage power amplification circuit, an inter-stage matching circuit, a second-stage power amplification circuit and an output matching circuit. The inter-stage matching circuit comprises a first inductor, a second inductor and a first capacitor; the second-stage power amplification circuit is of a cascode structure; and the output matching circuit comprises a third inductor and a fourth inductor which are coupled with each other. According to the low-noise amplifier, the high-frequency gain, the in-band gain flatness, the isolation degree, the stability and the output matching bandwidth of the low-noise amplifier can be improved.

The invention provides a multi-band composite high-integration TR assembly. The multi-band composite high-integration TR assembly comprises a shell, a front multi-layer board, a back multi-layer board, a C / X / Ku band receiving and transmitting circuit, a C / X / Ku band single receiving circuit and a Ka band receiving and transmitting circuit, wherein the front multi-layer board and the back multi-layer board are connected in the shell, the C / X / Ku band receiving and transmitting circuit is connected with the front multi-layer board, and the Ka band receiving and transmitting circuit is connected with the back multi-layer board. The low-cost scheme design of an all-solid-state microwave multilayer board suitable for batch production and testing is adopted, ports and transmission line layout are reasonably designed, multi-band composite mode transmission is achieved in the form of the front face and the back face, a C / X / Ku-band transmitting circuit and an H-polarization receiving circuit are integrated on the front face, and the transmission efficiency is improved. A C / X / Ku frequency band V polarization receiving circuit and a Ka frequency band receiving and transmitting circuit are integrated on the reverse side, different functional circuits are respectively transmitted through a microstrip line and a strip line through an interface circuit structure covering 1-40 GHz and an in-board vertical transition structure, the isolation degree of different circuits is improved, mutual crosstalk between different signals is avoided, and the transmission efficiency is improved. And the functions of high integration, high consistency, ultra wide band, numerical control phase shift, numerical control attenuation and the like of the assembly are realized.

The invention discloses an ultra-wideband multi-system combining platform containing an NR4.9 G frequency band. The combining platform comprises a front-stage combining module, a higher harmonic suppression filtering module and a final-stage combining module, wherein the pre-stage combining module is a common multi-system combining platform and covers 2G, 3G and 4G system signals of mobile communication, and the frequency band is 698-2400HMz; the higher harmonic suppression filtering module is used for frequency selection of the working frequency band of 698-2400MHz of the preceding-stage combining system and suppression of higher harmonics and clutters within the frequency band bandwidth of 2500-5000MHz; the final-stage combining module adopts a hierarchical combining design, NR2.6 G, NR3.5 G and a higher harmonic suppression filtering unit are used as a first stage, NR4.9 G is used as a second stage, the working frequency of the final-stage combining module covers 2515-2515-4960 MHz, and the final-stage combining module comprises a mobile NR4.9 G system. The system has the advantages that existing 2G, 3G, 4G and 5G system frequency bands and an NR4.9G system are integrated and applied to wireless public network coverage, and co-construction and sharing of existing resources within the working frequency band of 698-4960 MHz are achieved.

This application provides a dual-polarized differential base station antenna, relating to the field of communication technology. The dual-polarized differential base station antenna includes a dielectric substrate, a first resonant cavity, multiple second resonant cavity groups, a coupling component, and a coaxial feed conductor. The first resonant cavity is disposed inside the dielectric substrate and extends to the upper and lower surfaces of the substrate. A first radiation slot is provided on the upper surface of the first resonant cavity. Multiple second resonant cavity groups are symmetrically distributed around the first resonant cavity. Each second resonant cavity group includes at least one second resonant cavity, and a second radiation slot is provided on the upper surface of each second resonant cavity. The coupling component connects the first resonant cavity to each second resonant cavity group. The coaxial feed conductor is connected to a ground plane and penetrates the dielectric substrate to connect to the upper surface of the first resonant cavity. The dual-polarized differential base station antenna of this application achieves high gain, high isolation, and wide bandwidth performance while maintaining a low profile structure.

The invention provides an antenna structure and electronic equipment. The antenna structure comprises a first antenna and a second antenna which are adjacent to each other, a first feeding point is arranged on the first antenna, a second feeding point is arranged on the second antenna, a first branch knot and a second branch knot are arranged between the first antenna and the second antenna, and the first branch knot and the second branch knot are respectively connected to the ground. The first branch knot and the first antenna are spaced, the second branch knot and the second antenna are spaced, the length difference value of the first branch knot and the second branch knot is smaller than a set threshold value, and a breaking joint used for damaging a floor intrinsic mode is arranged between the first branch knot and the second branch knot. Therefore, coupling between adjacent antennas can be reduced, and isolation can be improved.

The invention discloses a node sub-health fault processing method and device, electronic equipment and a storage medium, which are applied to the technical field of distributed storage, and are used for solving the problems of poor timeliness of sub-health isolation and large influence on services in related technologies. Determining a sub-health copy corresponding to the business input and output operation; performing temporary isolation on the sub-health copy, and stopping write operation on the sub-health copy; in response to a permanent isolation instruction of the system management center, performing permanent isolation on a sub-health component corresponding to the sub-health copy; or, in response to an isolation cancelling instruction of the system management center, cancelling the temporary isolation of the sub-health copy. According to the method and the device, the corresponding sub-health copies can be temporarily isolated in time, the isolation timeliness is improved, the temporary isolation of the sub-health copies can be canceled according to requirements, and the problem of wrong isolation caused by too fast isolation is effectively avoided.

This invention discloses a wideband, high-isolation single-pole five-throw switch chip, comprising six ports, two power ports, five control ports, twenty microstrip lines, one capacitor C1, twenty-five switching transistors, twenty-five gate resistors, and five voltage control modules. The six ports are port 1, port 2, port 3, port 4, port 5, and port 6; port 1 is the RF input port; ports 2, 3, 4, 5, and 6 are output ports. The RF input and output ports are connected via the two power ports, five control ports, twenty microstrip lines, one capacitor C1, twenty-five switching transistors, twenty-five gate resistors, and five voltage control modules. Compared to existing single-pole five-throw switches, this invention is integrated on a single chip, offering the advantage of small size. The use of voltage control modules significantly reduces the number of power supply modules, facilitating application.

The utility model discloses a broadband bridge, which comprises a first input port, a first output port, an isolation output port, a coupling output port, a front-stage coupling branch knot, an intermediate-stage coupling branch knot, a final-stage coupling branch knot, a dielectric layer and a metal layer, the metal layer is provided with a gold bonding wire, a microwave input transmission branch, a first microwave output transmission branch, a second microwave output transmission branch, an isolation port output branch and two independent microstrip lines. Three-stage coupling is adopted, namely, the front-stage coupling branch knot is connected and coupled with the last-stage coupling branch knot through the microstrip line, and the middle-stage coupling branch knot is connected and coupled with the independent microstrip line six-line through the gold bonding wire, so that the requirements of broadband 6-18GHz and low insertion loss are met, the standing wave characteristic is improved, the isolation degree and the direction are good and are both smaller than-20dB, and the isolation degree and the direction are smaller than-20dB. And moreover, good amplitude-phase consistency is achieved, the amplitude is 3dB + / -0.3, the phase is 91 degrees + / -5 degrees, and the overall performance is improved.

The invention relates to the technical field of radar antennas, and provides a filtering antenna and an antenna system for a vehicle-mounted millimeter wave radar, the filtering antenna comprises a microstrip array antenna structure, a parasitic branch filtering structure and a feed transmission line, and the parasitic branch filtering structure is connected with the microstrip array antenna structure through the feed transmission line; a parasitic stub filtering structure of a short stub is added to a single side of the antenna, and a fan-shaped patch structure is arranged to form an adjusting circuit capacitive element by changing the radius of an open circuit fan-shaped stub structure; an inductive adjusting element is formed by combining a microstrip structure and a ground connection copper-clad hole, high-frequency coupling signal filtering is achieved, the influence on the amplitude and phase performance of the microstrip array antenna structure is small, more MIMO antenna channels are arranged on a low-cost and small-size radar PCB, meanwhile, the problems that coupling is serious and isolation is poor between the antenna channels are solved, and the antenna performance is improved. A miniaturized and high-isolation millimeter wave radar MIMO technology is realized, and the isolation between MIMO antenna channels of the whole board can be improved to 30 db or more.

The utility model discloses an isolating layer for heavy metal combined pollution soil reclamation, which comprises a foundation pit, and an isolating mechanism is arranged in the foundation pit. The isolation mechanism comprises a base, a fixing frame, a threaded groove, an isolation cover, a top cover, an inserting plate, an inserting groove, a rotary knob, a first single-groove belt wheel, a first belt, a second belt, a second single-groove belt wheel, a first rotating shaft, a second rotating shaft, a threaded rod, a groove, a cavity and a double-groove belt wheel. The four inserting plates are located at the front end and the rear end of the two sides of the outer surface of the upper end of the base correspondingly, the two fixing frames are located on the two sides of the middle of the outer surface of the upper end of the base correspondingly, and the threaded grooves are formed in the outer surfaces of the upper ends of the fixing frames. According to the isolation layer for heavy metal combined pollution soil reclamation, the isolation cover and the base can be rapidly assembled and disassembled, operation is easy, isolation can be conveniently conducted through the isolation cover, damage to new soil caused by external personnel or birds and beasts is reduced, and better use prospects are brought.

The invention discloses a transformer power-saving device for efficient power production equipment, which comprises a box body and a power supply mechanism, a cooling plate and a grid plate are arranged in the box body, the power supply mechanism is electrically connected with the cooling plate, the grid plate is arranged on the upper side of the cooling plate, the inner side wall of the box body is also fixedly connected with a permeable plate, and the permeable plate is fixedly connected with the box body. The ventilation plate is arranged on the upper portion of the box body, a space formed by the upper portion of the box body and the ventilation plate is communicated with the outside, a plurality of ventilation openings are formed in the ventilation plate, and a control device is arranged in each ventilation opening. The device has the advantages that when the temperature in the box body is low, the memory spring is in a contraction state, so that the sealing block seals the air outlet, impurities such as dust, rainwater and liquid in external air cannot enter the box body, and a good isolation effect between the box body and the outside is guaranteed; the inside of the box body is communicated with the outside, so that ventilation and heat dissipation are realized, and the temperature inside the box body is reduced.

The utility model discloses a metal part of a stamping fire grate, which belongs to the technical field of metal stamping parts and comprises a palm-sealing shell, a cover cap is fixedly sleeved at one end of the palm-sealing shell, isolation pieces are arranged on two sides of the outside of the cover cap, and an isolation frame is arranged on one side of each isolation piece. The shield cover is arranged at the gas end of the fire grate, the isolation frames are fixedly installed on the two sides of the outer portion of the shield cover in a welded mode, a heat insulation plate is arranged on one side of the outer portion of each isolation frame, the heat insulation plates are made of aluminum alloy materials, and an outer protection plate is fixedly installed on the outer portion of each heat insulation plate. The shield cover is arranged at the gas end of the fire grate, and the good isolation effect on the periphery of the fire grate is achieved through the shield cover; according to the invention, by arranging the isolation pieces on the two sides of the exterior of the cover cap and isolating the two sides of the cover cap through the isolation frame, the situation that the external components are too close to each other and are burnt and damaged is avoided, and the heat insulation plate plays a heat insulation role on the isolation frame, so that the situation that heat is diffused to the two sides and the adjacent components are burnt and damaged is avoided.

The utility model discloses a miniaturized double-frequency wide-beam terminal antenna, which relates to the technical field of mobile terminal antennas and comprises an antenna cap, an antenna housing, a radiator assembly, a feed network module, a radio frequency connector and an antenna base, and the radiator assembly, the feed network module and the radio frequency connector are sequentially distributed inside the antenna housing from top to bottom. According to the miniaturized double-frequency wide-beam terminal antenna, the radiation copper strip is arranged in a gradually-changed spiral form, and when the radiation copper strip is at the same rising angle, the spiral arm with the top open circuit structure has a wider beam width than the spiral arm with the short circuit structure, so that low-elevation electromagnetic signal radiation and reception of the satellite antenna are facilitated; the radiation copper strip is provided with four feeding points, each feeding point is connected with two oscillator arms with different lengths, the circular polarization characteristic and the double-frequency radiation characteristic of the antenna are guaranteed, the two oscillator arms with the same feeding guarantee different rising angles and widths, the isolation degree of double-frequency radiation is improved, the shape of a directional diagram is more regular, and higher radiation gain is achieved.

The present invention relates to the field of wireless communication technology, and provides a gain-adjustable low-noise amplifier and radio frequency chip, including a common input switching module, a first amplifier module, a second amplifier module, a first output matching module, a second output matching module, a first control module and a second control module; the input end of the common input switching module is used to receive a radio frequency signal, and the output end of the common input switching module is used to switch the radio frequency signal to the first amplifier module or the second amplifier module according to the first control module or the second control module; the first amplifier module and the second amplifier module respectively amplify the radio frequency signal, and output it through the first output matching module and the second output matching module respectively; the first control module is used to control the on-off of the first amplifier module to the ground, and the second control module is used to control the on-off of the second amplifier module to the ground. The present invention can achieve good isolation and performance indicators between input ports.

The application discloses a kind of copolymer organic semiconductor devices based on isolation and interconnection and preparation method, including substrate, photoetching blocking layer, insulating isolation layer, N organic field effect transistor and N-1 interconnection line;Photoetching blocking layer includes isolation layer and inorganic dielectric layer;Isolation layer is opened with N longitudinal through isolation groove along length direction;Inorganic dielectric layer includes lower dielectric layer and upper dielectric layer;Lower dielectric layer is located in N isolation, and upper dielectric layer is laid on the top of isolation layer and lower dielectric layer;Each organic field effect transistor includes semiconductor layer, source, drain and gate;Semiconductor layer is laid in the isolation groove at the bottom of corresponding lower dielectric layer section, and its material is organic copolymer.The application effectively utilizes isolation groove and photoetching blocking layer, and the semiconductor layer of different semiconductor materials is wrapped and isolated, so as to realize the integration of different organic field effect transistors on the same substrate, and the organic field effect transistor can realize effective interconnection.

The application discloses a high-isolation dual-radiation-mode dual-frequency filtering antenna, and relates to the technical field of antennas of wireless communication terminals; the high-isolation dual-radiation-mode dual-frequency filtering antenna comprises a first dielectric substrate to a fourth dielectric substrate which are sequentially arranged from bottom to top; a pair of differential feeding lines arranged on the lower surface of the first dielectric substrate; an intermediate metal surface arranged between the first dielectric substrate and the second dielectric substrate; a pair of feeding extension branches arranged between the second dielectric substrate and the third dielectric substrate; a circular patch arranged between the third dielectric substrate and the fourth dielectric substrate; an upper metal surface and a ring-shaped patch arranged on the upper surface of the fourth dielectric substrate; a feeding probe vertically penetrating the center of each dielectric substrate; and a plurality of groups of metalized short-circuit through holes; the application utilizes the resonant characteristics of the structure itself and electromagnetic mixed coupling effects to obtain dual-frequency dual-band filtering responses; and adopts a feeding mode combining differential feeding and probe feeding and orthogonal mode excitation to realize high isolation between the dual-frequency bands.

The invention provides a granular soil planting method for sweet potatoes. The granular soil planting method comprises the following steps that S01, grooves are formed; a groove with a certain depth is formed in the soil of the saline-alkali land through manual or mechanical equipment, and the groove is in a long strip shape with a regular section; step S02, forming an impermeable layer; preparing cohesive soil slurry, and uniformly spraying the cohesive soil slurry on the inner wall of the groove so as to form an impermeable layer with a certain thickness on the inner wall of the groove; s03, aggregate soil is laid; granular soil is evenly laid in the grooves, and the granular soil in the grooves forms planting soil; according to the granular soil planting method for the sweet potatoes, planting of the sweet potatoes can be well adapted, construction is easy, the cost is low, the effect is good, secondary pollution to the soil is avoided, and re-operation is facilitated.

The application discloses a medium-gain shaped horn antenna for interplanetary exploration, comprising a radiator assembly and a waveguide assembly, wherein the radiator assembly is fixedly connected to the top of the waveguide assembly. The radiator assembly comprises a multi-degree-of-freedom choke flange, and can realize double-frequency-band, double-circular-polarization and transmit-receive shared pattern shaping performance. The radiator assembly comprises an impedance matching ring, which realizes good impedance characteristics of a small-diameter circular waveguide horn at a low frequency band, and realizes port isolation of more than 25 dB without adding a filter. The radiator assembly and the waveguide assembly are metal structures made of aluminum alloy or magnesium alloy, and the antenna has good environmental adaptability in orbit, and has the advantages of simple structure, good rigidity, high reliability and the like.

The application discloses a C-band tuning-free duplexer and belongs to the technical field of microwave filters. The tuning-free duplexer comprises an upper conductor and a lower conductor, and the upper conductor and the lower conductor are buckled one above the other to form a waveguide cavity. The upper conductor is provided with a combining port in the middle of the top, and the lower conductor is provided with a low-frequency input / output port and a high-frequency input / output port at the bottom. The waveguide cavity from the low-frequency input / output port to the combining port constitutes a low-end filter, and the waveguide cavity from the high-frequency input / output port to the combining port constitutes a high-end filter. The main bodies of the high-end filter and the low-end filter are both a plurality of waveguide resonant cavities arranged along a straight line, the middle positions of each waveguide resonant cavity are provided with cavity loading, and adjacent waveguide resonant cavities are connected through inter-cavity coupling. The tuning-free duplexer adopts a symmetrical structure and a center loading mode, realizes tuning-free assembly, has the characteristics of high power bearing capacity, low transmission loss and excellent signal isolation, and is suitable for a C-band communication system.

The application provides a broadband symmetrical amplitude equalization directional coupler and a coupling method, relates to the technical field of microwave radio frequency passive devices, and comprises the following parts: a single-section coupling line located in an input through branch, the single-section coupling line being a double-layer metal biased wide-side coupling line; a symmetrical amplitude equalizer connected to a coupling port and an isolation port respectively; and an LC matching network connected to an input port and an output port respectively, so that the directional coupler suitable for 18-50GHz can be constructed, and strong coupling of the directional coupler is realized.

The application provides a wafer level packaging method and a wafer level packaging structure. A transfer unit comprises a substrate, a plurality of first chips arranged on the substrate, and a first oxide layer arranged on the surface of the first chips. A device wafer comprises a substrate, a plurality of second chips arranged on the substrate, and a second oxide layer arranged on the surface of the substrate and the second chips. A UV pre-cured layer is formed on the edge of the substrate and is flush with the first chips. A UV adhesive layer is formed on the edge of the second chips and corresponds to the UV pre-cured layer. The UV pre-cured layer and the UV adhesive layer are bonded and cured into a UV cured connecting layer. The device wafer and the first chips are subjected to annealing treatment, so that the first oxide layer and the corresponding second oxide layer are subjected to fusion bonding, and the UV cured connecting layer is removed by decomposition. A first plastic encapsulation layer is formed at the position of the UV cured connecting layer, and the substrate is removed. A second plastic encapsulation layer is formed to cover the pores between the first chips, thereby avoiding the thermal stress problem of the heterogeneous material interface.

The application provides a multi-frequency antenna and a communication device. The multi-frequency antenna comprises a reflecting plate, a first radiating unit and a second radiating unit, the first radiating unit and the second radiating unit are arranged on one side of the reflecting plate, and the first radiating unit is located between the reflecting plate and the second radiating unit. The first radiating unit comprises a first radiating part and a metal plate, and the metal plate is located between the first radiating part and the second radiating unit. The second radiating unit comprises a second radiating part and a metal ring, and the metal ring is located between the second radiating part and the metal plate. When the above structure is adopted, the size of the multi-frequency antenna as a whole can be reduced, and the first frequency band and the second frequency band have high isolation, so that the two frequency bands can work independently, the multi-frequency antenna can meet the miniaturization demand of the common antenna surface, the antenna works stably, and the efficiency is high.

The application discloses an ecological protection type river and lake construction water supply treatment equipment and relates to the technical field of water supply treatment. The treatment installation is provided with a water supply device, a layered control member, a secondary disinfection member, a lifting isolation member, a rotary cutting control member and an environmental protection control member. The environmental protection control member can be used for limiting the particle size of the flocculation and precipitation impurities during the discharge of the flocculation and precipitation impurities, avoiding the direct discharge of the agglomerated and blocked impurities, and solving the problems that the current river and lake construction water supply treatment equipment is inconvenient for the discharge of flocculation and precipitation and is inconvenient for the layered water taking.

The application provides a radio frequency switch circuit and a radio frequency chip, and the radio frequency switch circuit comprises a switch module, a gate voltage control module and a body voltage control module, wherein the switch module comprises a radio frequency switch transistor, the source of the radio frequency switch transistor and the drain of the radio frequency switch transistor are connected to each other to form a signal channel; the gate voltage control module is used for connecting the gate of the radio frequency switch transistor and providing an operating voltage for the radio frequency switch transistor; the body voltage control module is connected to the body of the radio frequency switch transistor and the gate of the radio frequency switch transistor respectively, and is used for dynamically adjusting the potential of the body of the radio frequency switch transistor according to the size of the operating voltage received by the gate of the radio frequency switch transistor. The application can effectively control the on-resistance and off-capacitance of the radio frequency switch circuit, thereby effectively improving the performance of the radio frequency switch.

This invention relates to a two-color erasable thermal paper and its preparation method, belonging to the field of printing consumables technology. The two-color erasable thermal paper includes, from top to bottom, a protective layer, a thermal coating layer, a base layer, and a substrate. The components of the thermal coating layer, by weight, include: 10-20 parts of filler B, 20-40 parts of color developer, 30-50 parts of adhesive resin B, 10-20 parts of dye, and 10-20 parts of temperature-regulating agent. The addition of a temperature-regulating agent to the thermal coating layer of this invention enables reversible erasing and writing, while improving its color retention performance, eliminating the need for sensitizers. The heat-insulating filler used in the base layer layer of this invention is a high-hollow-ratio material, which can enhance heat insulation and improve the heat resistance and sensitivity of the thermal two-color reversible erasable paper.

This utility model relates to the technical field of rotating machinery life testing platforms, and in particular to a base isolation and noise reduction structure for a rotating machinery life testing platform. The structure includes a base plate, a top plate, and a base. Isolation components are provided on the outer sides of the base plate and top plate, and noise reduction components are provided on the inner sides of the isolation components. An installation component is provided between the isolation components and the base plate and top plate. The noise reduction components include multiple sets of noise reduction strips, all of which are hollow inside and arranged in a regular, continuous, undulating wave shape. The multiple sets of noise reduction strips are arranged perpendicularly and interlaced. The inner cavity of the noise reduction strips is filled with sound-absorbing cotton. The upper and lower ends of the base are fixedly connected to the top plate and base plate, respectively. This utility model can reflect and scatter sound waves multiple times to extend the propagation path of the sound waves, causing them to consume more sound energy, thereby providing excellent noise reduction effects.

The utility model discloses an anti-dead-attraction device for a maglev train, which belongs to the technical field of safety driving devices for maglev trains and comprises a maglev track and a magnetic attraction component mounted on the surface of the maglev track, and a guide component is erected outside the maglev track. The supporting plate is fixed to the surface of the magnetic suspension track through a locking piece, the inner wall of a groove in the surface of the supporting plate is fixedly connected with a shaft rod, the exterior of the shaft rod is rotationally connected with a guide wheel, the magnetic suspension train directionally travels along the magnetic suspension track, and in the traveling process, the guide wheel rotates at a high speed under aerodynamic force of the traveling area of the magnetic suspension train. When the height fluctuation phenomenon of the maglev train occurs, the guide wheels have good isolation, auxiliary supporting and guiding performance on the maglev train, so that a good anti-dead-suction protection effect is achieved, and the driving safety is improved; and the drainage groove is formed in the bottom of the supporting plate and communicated with the groove, so that rainwater is conveniently drained, and the working area of the guide wheel is kept dry.

This invention discloses a miniaturized four-channel combining module based on the TE20 mode, belonging to the field of millimeter-wave power combining technology. It includes a layered upper cavity, a mezzanine, a lower cavity, and an RF unit. The RF unit comprises a TE10-TE20 waveguide distributor, two amplification branches, and a TE20-TE10 waveguide combiner. Each amplification branch includes a TE20 mode filter, a waveguide-microstrip transition, a pair of amplifier chips, and a microstrip-waveguide transition connected sequentially. The TE10-TE20 waveguide distributor and the TE20 mode filter are disposed in the upper and lower cavities. The waveguide-microstrip transition, the pair of amplifier chips, and the microstrip-waveguide transition are disposed on opposite sides of the mezzanine. The TE20-TE10 waveguide combiner is disposed in the upper cavity, the mezzanine, and the lower cavity. This invention utilizes a high-isolation waveguide distributor / combiner to improve branch isolation, shorten the combining path, and has a compact overall structure with advantages such as wide bandwidth, high isolation, high combining efficiency, and miniaturization.