300results about How to "High gain" patented technology

A broadband omni-directional bicone antenna. The antenna can comprise conductive surfaces of conical voids provided within a solid dielectric structure. The outside surface of the solid structure can support a radio frequency (RF) lens geometry operable for beam forming. The beam forming can modify the elevation pattern of the electromagnetic radiation from the bicone antenna. The solid dielectric structure may be machined or molded from a single piece of material. The conical voids provided within the solid structure can be metallized to provide conductive bicone radiators. The outer surface beam shaping lenses can be zoned or continuous and can provide elevation patterns with increased gain, cosecant squared falloff, or various other patterns. The beam shaping lens may be formed from any low-loss dielectric. Alternatively, the lens may be formed from a less dense material such as dielectric foam that can support radial conductive beam forming vanes.

The invention provides a method for testing the dynamic strain of the surface of a rotating body in an electromagnetic environment. The method comprises the following steps: constructing a bridge by using strain gauges and acquiring dynamic characteristic data of the rotating part under actual constraint conditions; performing simulation calculation according to the dynamic characteristic data, and determining the optimal pasting position of the strain gauge; pasting a strain gauge and formulating a wiring scheme of a strain gauge wire; the strain gauge is connected with a voltage signal amplifier, the amplified signal is connected with a data acquisition system through a conductive slip ring, and the amplified strain signal is recorded and processed; acquiring strain signals in real time and taking the strain signals as test data, and performing whole-course test in a full-rotating-speed range to complete dynamic strain test on the surface of the rotating body. The system has high sensitivity, the sensitivity and the measurement precision of the system are improved through full-bridge configuration, larger output signals are provided, the full bridge can achieve temperature compensation through symmetrical circuit design, and the system has good linear output characteristics and facilitates signal processing and analysis within the strain range.

The embodiment of the invention provides a base station antenna, and relates to the technical field of communication. The base station antenna comprises a housing, a phase shifter and a combiner. The shell is provided with combining cavities and phase shifting cavities, the two phase shifting cavities are arranged side by side in the first direction, the combining cavities are arranged on the same side of the two phase shifting cavities in the second direction in a stacked mode, the first direction is perpendicular to the second direction, and the size of the combining cavity in the first direction is larger than the size of any phase shifting cavity and smaller than the sum of the sizes of the two phase shifting cavities; the phase shifter comprises two phase shifting modules corresponding to the phase shifting cavities, each phase shifting module is arranged in the corresponding phase shifting cavity, and each phase shifting module is provided with a phase shifting network; the combiner is arranged in the combining cavity and provided with a combining network, and the combining network is connected with the two phase shift networks. According to the base station antenna provided by the embodiment of the invention, multi-frequency, miniaturization and integration are realized, the gain, radiation efficiency and sidelobe performance of the base station antenna are optimized, the feed network is simple, and the resonance phenomenon is avoided.

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 belongs to the technical field of antennas, and particularly relates to a low-sidelobe X-waveband waveguide slot array antenna. The antenna comprises an antenna array plane, the antenna array plane comprises a plurality of sub-array antennas which are arranged in parallel at equal intervals, each sub-array antenna is a waveguide slot array antenna, each waveguide slot array antenna is externally connected with a TR assembly, and the center-to-center distance d1 between every two adjacent waveguide slot antennas is 16mm; according to the technical requirements, horizontal polarization is achieved in the mode that an inclined slot is formed in the narrow side of a rectangular waveguide, finally, the design of the low-sidelobe horizontal polarization waveguide slot traveling wave array antenna is achieved, and the sidelobe level in the antenna working frequency range averagely meets the design target that the sidelobe level of a transmitting pitching face is lower than-12dB, the sidelobe level of a receiving pitching face is lower than-25dB, and the sidelobe level of the receiving pitching face is lower than-25dB. According to the invention, the side lobe level of the azimuth plane is lower than-25dB, the normal transmitting gain is greater than 35dBi (full-band), the receiving gain is greater than 33.5 dBi, and the antenna has the advantages of low side lobe, high gain and narrow beam, and is suitable for being applied to an X-band radar communication system.

The invention provides a multi-junction surface-emitting laser and a light-emitting module. A first reflecting layer, an active region and a second reflecting layer are sequentially stacked on a substrate, the active region is composed of at least two PN junctions or P-I-N junctions, and the PN junctions or the P-I-N junctions are connected through tunnel junctions; wherein the material of the substrate is gallium arsenide or indium phosphide, the crystal face of the substrate is {n11} crystal face family, n is 0 or an integer greater than 1, and anisotropic gain can be obtained in the VCSEL by using the non-(001)-oriented substrate and the quantum well, so that polarization in a quantum well plane (active region) is controlled to obtain higher gain, a grating structure does not need to be additionally arranged, the preparation process is simplified, and the preparation cost is reduced.

The invention discloses a terahertz wave band circularly polarized antenna based on sequential rotation feeding, and belongs to the field of radio frequency front-end devices. The circularly polarized antenna is composed of four microstrip patches, chamfers located on a radiation patch, a microstrip line, a microstrip line feed port, a sequential rotation feed network, a dielectric substrate, a metal ground backboard and a microstrip line matching structure. A 90-degree phase difference is generated by strictly designing the electrical length from each port to the feed network to realize circular polarization performance, right-handed circularly polarized waves are radiated, the radiation gain is 10.47 dB, the 3dB axial ratio bandwidth is greater than 8GHZ, the 3dB axial ratio range exceeds 90 degrees, and the complete half-power beam width is covered. The antenna adopts the microstrip line for feeding, the loss of the microstrip line is small, the microwave transmission characteristic is good, and the antenna radiation efficiency is high. The antenna adopts a single-layer board design, has no complex feed network, and is simple in structure and convenient to manufacture.

The invention relates to the technical field of communication beam control, in particular to a beam control algorithm for wireless communication, which comprises the following steps of: selecting an initial beam direction set through a preset beam mode library; constructing a channel state feature map through a deep learning model, and predicting a future channel change trend of the user; according to the future channel change trend of the channel state feature map, preliminarily adjusting the beam direction set to generate a plurality of candidate beam directions; the self-adaptive tuning module based on reinforcement learning adjusts the beam width, so that the beam is concentrated in the target user direction and covers a potential multi-path reflection path; and continuously updating the beam pattern library and the deep learning model. According to the invention, the beam direction can be dynamically adjusted, so that the effectiveness and stability of signal coverage are improved, and the communication quality in a complex propagation environment is ensured.

The invention provides a sampling modulation excitation signal phase acquisition device for an alternating current impedance method in the technical field of lithium battery detection. Comprising an excitation current AC signal synchronous extraction module, a signal in-phase and anti-phase switching control module, a phase adjustment module, a signal high gain and amplitude limiting module and a phase adjustment signal output module. The excitation current AC signal synchronous extraction module, the signal in-phase and anti-phase switching control module, the phase adjustment module, the signal high gain and amplitude limiting module and the phase adjustment signal output module are connected in sequence. The method has the advantage that the alternating-current impedance test precision is greatly improved.

The invention provides a four-frequency-band reconfigurable load modulation balanced amplifier structure and a regulation and control method thereof, and aims to solve the problems that in the existing power amplifier technology, the efficiency is low during power back-off, and multi-scene requirements cannot be met. The four-frequency-band reconfigurable load modulation balanced amplifier comprises a 90-degree Lange coupler of an input port and a 90-degree Lange coupler of an output port; a two-stage reconfigurable balanced power amplifier composed of an input matching network, a reconfigurable inter-stage matching network and an output-stage pre-matching network and a two-stage control signal power amplifier are combined through an active load modulation technology and a reconfigurable technology, a compact matching network is utilized, and a reconfigurable power amplifier is formed. The efficiency of output power rollback is greatly improved, and the system requirements in different frequency band application scenes can be met.

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 discloses a K-band amplitude-limiting low-noise amplifier, and belongs to the technical field of radio frequency microelectronics. The circuit comprises an input matching module, a diode amplitude limiting module, an inter-stage matching module, a low-noise amplification module and an output matching module which are cascaded in sequence, the input matching module is used for realizing impedance matching between a radio frequency signal input end and the diode amplitude limiting module and transmitting a radio frequency signal; the diode amplitude limiting module is used for limiting the amplitude of the radio frequency signal and transmitting the radio frequency signal; the inter-stage matching module is used for realizing impedance matching between the diode amplitude limiting module and the low-noise amplification module; the low-noise amplification module is used for carrying out amplification processing on the radio frequency signal after amplitude limiting and transmitting the radio frequency signal; and the output matching module is used for realizing impedance matching between the low-noise amplification module and the radio frequency signal output end and outputting the amplified radio frequency signal. According to the invention, the amplitude of the input signal can be limited, so that the amplitude is kept in a bearable range of the low-noise amplification circuit, and the stability and reliability of the whole system are ensured.

The embodiment of the invention provides a base station antenna and a base station. The base station antenna comprises a first antenna array, a metasurface lens and a second antenna array, the metasurface lens is located between the first radiator of the radiation unit of the first antenna array and the second antenna array, and is used for reflecting a radiation signal of the first antenna array and carrying out wavefront phase regulation and transmission on the radiation signal of the second antenna array. Therefore, the radiation signal of the second antenna array penetrating through the metasurface lens is approximately focused into a plane wave. The base station comprises the base station antenna. According to the scheme, a common-caliber array antenna can be realized, the defects of mutual shielding of antennas and mutual interference of antenna performance are avoided, the problem of structural interference can be avoided, and the antenna gain can be improved.

The invention provides a 45-degree polarized waveguide slot antenna, and the antenna comprises a plurality of metal layers which are seamlessly attached, and the metal layers are a radiation layer, a slot layer, and a feed waveguide layer. The radiation layer is provided with a pair of C-shaped metal walls, and the bottom of the radiation layer is provided with a plurality of horn mouths. The slit layer is provided with a plurality of inclined slits which are arranged and distributed in parallel, the included angle between the longitudinal center line of each inclined slit and the longitudinal center line of the slit layer is 45 degrees, and the plurality of inclined slits correspond to the plurality of horn mouths one by one; the feed waveguide layer is provided with a ridge waveguide resonant cavity, the inner side of the cavity side wall is provided with a plurality of convex blocks, and the center of the bottom of the feed waveguide layer is provided with periodic concave-convex ridges; one end of the narrow side of the cavity side wall is provided with a rectangular feed waveguide port. Through the antenna with the multilayer metallization structure, the radiation performance of large broadband, high gain, low side lobe and low cross polarization is realized, and the antenna can be widely applied to communication systems such as millimeter wave satellites, radars and the like.

The invention discloses a broadband reflection amplification circuit design method based on a real frequency matching method, which comprises the following steps: firstly designing a reflection amplification circuit, designing a real frequency matching network based on the real frequency matching method, and finally inserting the real frequency matching network into the input end of the reflection amplification circuit to construct the broadband reflection amplification circuit based on the real frequency matching method. According to the method, the input impedance of the reverse amplification circuit is tested through the load traction technology, then the parameter characteristics of the matching network are calculated through the optimization algorithm, and finally the structure and parameter values of the matching network are obtained through the circuit synthesis method, so that the method is not limited by a specific matching network architecture, the performance of the matching network can be greatly improved, and the reliability of the matching network is improved. The problem of broadband matching between the transmitting-receiving antenna and the reflection amplification circuit is solved, so that the reflection amplification circuit can realize high gain under different input powers and input frequencies, the working bandwidth of the reflection amplification circuit is expanded, and the purpose of expanding the application scene of the reflection amplification circuit is achieved.

The invention belongs to the technical field of antennas, and relates to a dielectric resonator antenna, which comprises a bottom plate and a dielectric block arranged on the bottom plate, the dielectric block comprises a first part of a regular quadrangular frustum pyramid structure, and the lower bottom surface of the first part is arranged at the center of the bottom plate to form a dielectric resonator; the dielectric block further comprises a second part of a regular quadrangular frustum pyramid structure; the upper bottom surface of the second part is overlapped with the upper bottom surface of the first part; the side length of the lower bottom surface of the second part is larger than that of the first part, and the height of the second part is smaller than that of the first part; the lower bottom surface of the second part is provided with a resonant tank recessed towards the first part, and the resonant tank is of a cube structure. The antenna can be applied to the S wave band, and ultra wide band and light weight are realized at the same time.

The invention belongs to the technical field of millimeter wave communication, and discloses a low-noise amplifier circuit for short-distance wireless communication, which comprises an input matching network, a transistor amplification network, an output matching network and a biasing circuit, the input end of the low-noise amplifier circuit is connected with the input end of the input matching network and is used for inputting a radio frequency signal; the input matching network is used for realizing 50-ohm impedance matching between an input radio-frequency signal and the transistor amplification network, the output end of the input matching network is connected with the input end of the transistor amplification network, the transistor amplification network is used for realizing amplification of the radio-frequency signal, and the output end of the transistor amplification network is connected with the input end of the output matching network; the output matching network is used for achieving output impedance matching, the output end of the output matching network is the output end of the low-noise amplifier circuit, and the bias circuit is used for providing first bias voltage and second bias voltage for the transistor amplification network. According to the invention, the low-noise and high-gain signal amplification function can be realized, the signal loss can be effectively reduced, and the available bandwidth can be expanded.

The invention discloses a low-noise amplifier based on an inverter and a multi-objective optimization method of the low-noise amplifier. The low-noise amplifier comprises the inverter, an input capacitor CI, a feedback capacitor CF and a single-stage operational amplifier. The phase inverter is formed by connecting a PMOS (P-channel Metal Oxide Semiconductor) tube and an NMOS (N-channel Metal Oxide Semiconductor) tube in series, the input capacitor CI and the feedback capacitor CF are respectively of a split capacitor structure, the positive input end of the single-stage operational amplifier is connected with the output end of the phase inverter, the negative input end of the single-stage operational amplifier is connected with reference voltage, the output end of the single-stage operational amplifier is connected with a grid electrode of the NMOS tube through a resistor R2, the grid electrode of the PMOS tube is connected with a resistor R1, and the resistance value of the resistor R1 is equal to that of the resistor R2; the stability and the noise performance of the amplifier circuit are improved; by using a multi-objective optimization design method, the design parameters of the low-noise amplifier are optimized so as to meet the amplification requirements of ultrasonic pulse echo signals with different frequencies, and the design efficiency is improved.

A high-gain automatic phase modulation quartz vibrating beam accelerometer control circuit comprises a feed-through suppression module, the feed-through suppression module and a quartz vibrating beam resonator form a parallel resonance unit, and the output of the parallel resonance unit is connected with the input of a front-end amplification module. The output of the front-end amplification module is connected with the input of the high-pass filtering module and the first input of the automatic phase control module, the output of the high-pass filtering module is connected with the first input of the dynamic phase shift module, and the second input of the dynamic phase shift module is connected with the output of the automatic phase control module. The output of the dynamic phase shift module is connected with the input of the differential driving module through the low-pass filtering module, the square wave shaping module and the amplitude control module; the output of the differential driving module is connected with the input of the feed-through suppression module, the driving end of the quartz vibrating beam resonator and the second input of the automatic phase control module; according to the invention, low-noise driving of the high-impedance quartz vibrating beam is realized, and the loop phase error is dynamically compensated to improve the stability and resolution of the accelerometer.

An efficient pump, a motor set, a suction and discharge set, an output set and a smashing cutter are assembled in a pipe, the specification of the suction and discharge set adapts to scenes required by life and production, fluid enters the pipe from a lower inlet, a gas-liquid-electric motor is installed in the pipe, the smashing cutter is installed on a motor shaft, the smashing cutter is installed on the motor shaft, and the pipe is provided with a gas-liquid-electric motor connector in a matched mode. A middle hole of a fluid connector is communicated with a variable-diameter small flow channel, a feeding cylinder is provided with a hole, the wheel shaft is provided with the wheel blades, fluid enters from a lower inlet and flows upwards to an upper outlet to flow out of the variable-diameter small flow channel, and a gas-liquid electric motor is a pneumatic motor, a hydraulic motor and an electric motor for short. The specifications of the parts are set according to actual needs. The output of the sucked, discharged and conveyed fluid is extremely high, the size is from small to large, manufacturing and application can be set, durability, high yield and environmental protection are achieved, cost is reduced, benefit is increased, and innovative and good life, production and ecology are benefited.

The invention discloses a high-speed low-power-consumption comparator of an SAR ADC, and relates to the technical field of analog or digital-analog hybrid integrated circuits. The comparator comprises a pre-amplification stage and a latch stage, an enable signal cp end of the pre-amplification stage is connected with an enable signal Ki, a positive input end of the pre-amplification stage is connected with a differential input positive end signal vp, a negative input end of the pre-amplification stage is connected with a differential input negative end signal vn, a positive output end vop is connected with a positive input end of the latch stage through a switch K1, and a negative output end von is connected with a positive input end of the latch stage through a switch K2. The switch K1 and the switch K2 are both controlled by an enable signal Ki; a differential input positive end signal vp is connected with the positive input end of the latch stage through a switch K3, a differential input negative end signal vn is connected with the positive input end of the latch stage through a switch K4, and the switch K3 and the switch K4 are both controlled by an inversion signal Kim of an enable signal Ki. According to the scheme, the gain and the bandwidth of the pre-amplification stage are improved, so that the speed and the precision of the pre-amplification stage are improved at the same time.

The invention provides a training data validity evaluation method, system and device, and the method comprises the steps: obtaining a training set which is obtained through uniform downsampling from to-be-evaluated data; obtaining a test set, wherein the test set comprises at least one benchmark test set and at least one associated test set; training a probe model by using the training set; testing the probe model by using the test set, and recording test indexes; making an observation diagram according to the test indexes, wherein the step of making the observation diagram comprises: establishing a rectangular coordinate system by taking the test index of the benchmark test set as a horizontal axis and the test index of the associated test set as a longitudinal axis; drawing key points in the rectangular coordinate system according to the test indexes; and performing validity evaluation on the to-be-evaluated data according to the observation map. The method has the advantages that the data validity evaluation can be quickly given with very low computing power, the model research and development iteration efficiency can be improved, and the gain is more obvious especially for a leading-edge complex model.

The invention provides a broadband wide-beam dielectric resonator antenna, which belongs to the technical field of wireless communication and antennas and structurally comprises a dielectric resonator serving as a main antenna radiator, a dielectric substrate A, a metal floor, a dielectric substrate B, a metal microstrip line and a U-shaped metal cavity from top to bottom in sequence. The U-shaped metal cavity serves as a main element of the antenna for realizing a wide beam, is placed at the bottom of the antenna, and is used for introducing vertical current and horizontal current for supplementary radiation; and the metal floor is connected with the U-shaped metal cavity. According to the invention, the bandwidth of the dielectric resonator antenna is expanded through the mode of exciting and combining the grooves and the fundamental mode of the dielectric resonator; the U-shaped metal cavity is formed by bending the floor of the dielectric resonator antenna, so that the beam width of the antenna on the E surface and the H surface is widened. In a working frequency band, the beam widths of the two surfaces are both greater than 180 degrees, so that a radiation effect with stable wide beam characteristics in a relatively wide frequency band is realized; through a method of introducing a metal sheet on the floor, the high-frequency gain is improved while the beam width is maintained.

The invention provides a WPT system and a parameter design method based on four-pole-plate coupling full-duplex communication, four groups of coupling pole plates are arranged in the system, the first group of coupling pole plates and the second group of coupling pole plates are used as coupling structures of energy transmission channels, the first group of coupling pole plates and the third group of coupling pole plates are used as data forward transmission coupling interfaces, and the third group of coupling pole plates are used as data reverse transmission coupling interfaces. The second group of coupling polar plates and the fourth group of coupling polar plates are used as data reverse transmission coupling interfaces, a primary side signal source and a primary side LC wave blocking network are arranged between two primary side polar plates of the data forward transmission coupling interface, and a secondary side compensation inductor and a secondary side sampling resistor are arranged between two secondary side polar plates of the data forward transmission coupling interface; a primary side compensation inductor and a primary side sampling resistor are arranged between two primary side pole plates of the data reverse transmission coupling interface, and a secondary side signal source and a secondary side LC wave blocking network are arranged between two secondary side pole plates of the data reverse transmission coupling interface. The invention has the effect that the full duplex mode transmission of signals can be realized by using fewer devices.

The invention provides a curved surface polarization torsion reflecting surface and an antenna using the same, and belongs to the technical field of antennas. The curved surface polarization torsion reflection surface comprises a curved surface dielectric plate, and a metal bottom plate and an electromagnetic metasurface which are respectively arranged on the outer side and the inner side of the curved surface dielectric plate; the electromagnetic metasurface is formed by periodically arranging a plurality of single-layer electromagnetic metasurface units. The single-layer metasurface unit with the polarization torsion function is conformal on the curved surface, so that the technical problems that a traditional multi-layer planar polarization torsion structure is complex to process, curved surface conformal is difficult, and the performance is deteriorated after conformal are solved. The reflecting surface is preferably a paraboloid, so that the incident wave polarization torsion is realized, and the spherical wave can be converted into the plane wave to improve the antenna gain. The metasurface unit keeps good cross polarization reflection performance within the wide incidence angle range of 0-40 degrees, is suitable for curved surface conformal design, can be integrally formed through 3D printing, and is easy and convenient to machine and stable in performance.

The invention discloses a GNSS PATCH antenna capable of improving low elevation gain and efficiency, the GNSS PATCH antenna comprises a dielectric substrate, a top metal sheet, a coaxial feeder line and a loading metal sheet, the top metal sheet is arranged at the top of the dielectric substrate, a first through hole is vertically and concavely formed in the middle of the dielectric substrate, the coaxial feeder line is arranged on the lower end wall of the first through hole, and the loading metal sheet is arranged on the lower end wall of the first through hole. The middle of the lower end wall of the top metal sheet is provided with a feed point, the coaxial feeder line is internally provided with a Pin needle, the Pin needle penetrates through the first through hole and is electrically connected with the feed point, the lower end wall of the dielectric substrate is provided with a reflection ground plane, the loading metal sheets are respectively arranged at four vertex angles of the dielectric substrate, each loading metal sheet is provided with two edge covering branches which are perpendicular to each other, and each edge covering branch is provided with a first through hole and a second through hole. The edge covering branches abut against the side walls of the dielectric substrate respectively, and the loading metal sheets are electrically connected with the reflection ground plane. According to the technical scheme, the low-elevation gain and efficiency can be improved, the size of the antenna is not increased, and the antenna is particularly suitable for being applied to miniaturized equipment.

The invention discloses a differential derivative structure circuit based on three-coupling transformation and an amplifier, and relates to the technical field of amplification circuit design. The differential derivative structure circuit comprises a three-coupling inductance network and N output parts. Through a three-coupling transformation mode, power supply of a main amplifier tube and an auxiliary amplifier tube in a differential derivative structure formed by connecting MOS tubes in parallel is integrated into an inductance matching network, so that homologous coupling of the main amplifier tube and the auxiliary amplifier tube on a radio frequency signal path is realized, physical isolation and independent bias control are also realized on a direct current path, and the power supply efficiency is improved. Therefore, a resistor does not need to be used, excessive use of a capacitor is avoided, loss caused by self impedance of the capacitor and ground parasitic capacitance loss are reduced, gain is greatly improved, extra area occupation caused by the capacitor and the resistor is effectively inhibited, and thermal noise introduced by the resistor is eliminated by utilizing the characteristic of low impedance of inductive coupling. Therefore, post-stage noise is effectively suppressed, and the noise coefficient is reduced.

The invention provides an antenna array for a microwave moisture meter and the microwave moisture meter. The antenna array for the microwave moisture meter comprises a power division network and two sets of radiation array units, the power division network is arranged on a first dielectric substrate, and the two sets of radiation array units are symmetrically arranged at the two ends of the first dielectric substrate; the radiation array unit comprises a plurality of unit antennas, each unit antenna comprises a feed structure, a plurality of rectangular slot lines, an index gradual change slot formed by two index gradual change slot lines and a resonant ring formed at the top end of the index gradual change slot, and the plurality of rectangular slot lines are arranged on two sides of a radiation surface of the index gradual change slot lines. And the lengths of the rectangular slot lines arranged on the same side of the radiating surface are sequentially reduced along the direction from the top end of the exponential gradual change slot to the opening of the exponential gradual change slot. According to the antenna array for the microwave moisture meter, the gain can be increased, the beam width can be reduced, and the bandwidth can be increased.

This invention discloses a broadband circularly polarized integrated feed transmission array antenna covering the entire Ka-band, comprising an array surface and an integrated feed. The phase center of the integrated feed coincides with the focal point of the array surface, illuminating the array surface perpendicularly and forming a 45-degree angle with the array surface in the horizontal direction. The array surface comprises multiple array elements of different sizes arranged linearly. Each array element includes two orthogonally arranged first and second dielectric substrates, which have the same height but different thicknesses. The integrated feed comprises a stacked first and second PCB board. A substrate integrated waveguide is disposed on the first PCB board with coupling slots, and a substrate integrated waveguide cavity and annular metal patches surrounding the substrate integrated waveguide cavity are disposed on the second PCB board. This invention achieves a wide axial ratio bandwidth and gain bandwidth, and has the advantages of low profile, light weight, easy fabrication, and low cost.

The invention discloses a quasi-single-mode circular waveguide conical horn antenna, a radar and a communication device. The quasi-single-mode circular waveguide conical horn antenna comprises a circular waveguide section and a conical horn section. Conductor loss is reduced by remarkably increasing the diameter of the circular waveguide, and axial periodic annular grooves are formed in the inner wall of the circular waveguide to form a spatial mode filter and a selective attenuation high-order mode, so that high radiation efficiency and high mode purity are realized at the same time in a millimeter wave frequency band. And the conical horn section adopts an index profile to realize high-directionality radiation. The antenna structure effectively solves the technical problems of large loss and impure mode in a millimeter wave high-frequency band in the traditional design.