17results about How to "Large power capacity" patented technology

According to the broadband single-layer dual-polarization microstrip antenna, a radiation patch and a short-circuit metal column are combined to form an EBG structure, and the working bandwidth is greatly improved. And the two ports are connected with the circular parasitic patch through the coaxial line, so that radiation energy coupling is realized, and impedance matching is improved. And two ports are orthogonally arranged, so that the isolation is improved. The four slits suppress the coupling current between the adjacent antenna units, an additional decoupling structure is not needed, the polarization purity is ensured, and the cross polarization is less than-15dB. The antenna is compact in structure, a single-layer substrate is adopted, the profile of the antenna is 0.08 working wavelength, miniaturization, dual polarization, broadband and high isolation are achieved, processing is simple, the antenna works in the 16.7 GHz Ku frequency band, and the-10 dB impedance bandwidth is about 16%. According to the invention, a miniaturized, dual-polarized, broadband, high-isolation and monopole-like radiation mode is realized, the radiation mode is stable, and the antenna can be used as a phased array unit.

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 utility model discloses a broadband terahertz waveguide band-pass filter with high out-of-band rejection. The broadband terahertz waveguide band-pass filter comprises an input waveguide, an output waveguide and a plurality of first band elimination elements, the input waveguide serves as the input end of the broadband terahertz waveguide band-pass filter, the output waveguide serves as the output end of the broadband terahertz waveguide band-pass filter, the width of any one of the first band-stop elements is smaller than the width of the input waveguide and the width of the output waveguide, and the width of any one of the first band-stop elements is smaller than that of the output waveguide. The plurality of first band-stop elements are sequentially arranged between the input end and the output end to form a high-frequency stop band of the broadband terahertz waveguide band-pass filter; therefore, a brand-new band-stop element branch structure is adopted to form a high-frequency stop band of the filter, so that the filter has a transmission zero point outside the high-frequency band, and meanwhile, the filter has the advantages of high out-of-band rejection and high bandwidth; therefore, the terahertz radio frequency transmission device is very suitable for large-scale application and popularization in the terahertz radio frequency transmission field.

The invention discloses a closed-loop control surge suppression circuit based on an NMOS tube, and belongs to the technical field of power electronics, the circuit is bridged between a power supply and a load, the protection threshold of surge voltage is changed by adjusting the resistance value of a resistor, and when the surge voltage in the power supply exceeds the protection threshold, the surge suppression circuit is turned off. The output voltage is changed through closed-loop control of an NMOS tube in the voltage division suppression sub-circuit, and then the working state of the closed-loop control surge suppression circuit based on the NMOS tube is adjusted to suppress the surge voltage. The boost circuit is introduced into the power supply sub-circuit, and the output end of the boost circuit is connected with the second end of the fourth resistor and the second end of the second resistor in the feedback control sub-circuit, so that closed-loop feedback is completed by taking an NMOS tube as a core and utilizing discrete devices which are relatively low in cost and easy to obtain, and a protection threshold value of surge voltage can be accurately set by adjusting reference voltage; and the voltage higher than the protection threshold is clamped, so that the voltage on the load is not higher than the protection threshold to protect the load.

The invention relates to the technical field of wireless communication, and discloses a low orbit satellite communication K / Ka frequency band broadband dual circularly polarized antenna. According to the technical scheme, the antenna is characterized by comprising a radiation port surface, a resonant cavity, a dual-circular polarizer, a quasi-TEM transmission air cavity layer, a left polarization broadband feed network layer, a right polarization broadband feed network layer, a TEM mode conversion terminal, a polarization switch, a transceiving duplexer, a first standard waveguide port layer and a second standard waveguide port layer. The antenna is simple in structure, has a self-packaging characteristic, is good in electromagnetic compatibility, and can achieve the high gain, wide bandwidth and high circular polarization purity of the antenna. The shielding air cavity is formed by structure stacking and the metalized through holes, and when a plurality of circuits are integrated together, mutual interference is small, the structure is compact, assembling is convenient, and electrical performance is excellent.

The invention discloses a reactive compensation method and device for a compressed air energy storage power station, and the method is applied to the compressed air energy storage power station, and comprises the steps: starting a multi-stage motor based on a preset time sequence, and enabling the motor to be used for controlling a compressor; determining a first compensation parameter of each motor of the multi-stage motor, wherein the first compensation parameter is used for representing the reactive power output capability of each motor; a first loss parameter of the compressed air energy storage power station is obtained, the first loss parameter comprises the reactive power demand of a target motor and the reactive power demand of auxiliary power, and the target motor comprises at least one motor. When air is compressed, the synchronous motor serves as a reactive power supply to supplement reactive power consumption of the asynchronous motor and auxiliary power; during expansion power generation, the synchronous generator serves as a reactive power supply to supplement reactive power consumption of auxiliary power.

The embodiment of the present invention discloses a small hybrid mode filter with two resonant cavities, belonging to the field of communication technology. The filter comprises: n resonant cavities connected in series, and a metal sheet is spaced between each two adjacent resonant cavities, n≥3; the first and last resonant cavities of the n resonant cavities are metal resonant cavities, and the remaining n‑2 resonant cavities are dielectric dual-mode resonant cavities; the n resonant cavities are coupled through the coupling window on the metal sheet. The filter provided by the embodiment of the present invention has the characteristics of compact size, low loss, large power capacity, high out-of-band suppression, and good harmonic performance, so as to effectively improve the anti-interference ability and spectrum utilization of the 5G communication system, reduce the power consumption of the 5G communication system, and improve the coverage of the 5G communication system.

The invention discloses a sinusoidal staggered double-grid slow-wave structure, which relates to the field of vacuum electronic technology and solves the problems of large transmission loss and narrow bandwidth of the existing slow-wave structure. The key points of the technical solution are: comprising an upper grid portion and a lower grid portion respectively arranged on the upper and lower sides, the upper grid portion and the lower grid portion both form sinusoidal protrusions at equal intervals along the axial direction to form a periodic waveguide curve, and the periodic waveguide curve of the upper grid portion and the periodic waveguide curve of the lower grid portion have a phase difference; the mutation point in the field of the traditional rectangular protrusion is reduced by the smooth sinusoidal protrusion, thereby reducing the loss of electromagnetic waves in the transmission process, and the sinusoidal protrusions of the upper and lower grid portions are staggered, which has a higher bandwidth than the traditional staggered double-grid slow-wave structure, and provides a traveling wave tube slow-wave structure with improved output power for submillimeter wave bands and terahertz wave bands.

The utility model discloses a 10MHz-678MHz small-size directional coupler, which comprises two layers of PCBs (printed circuit boards) and a metal shell, each layer of the PCBs is grounded in a large area, that is, the ground is laid in the space outside an element bonding pad and a wire of the PCB layer, the bottom layer of the PCBs is the complete ground, an inductor L1, an inductor L2, an inductor L3 and an inductor L4 are arranged on the PCBs, and the inductor L1, the inductor L2, the inductor L3 and the inductor L4 are arranged on the metal shell. The layout of the directional coupler in the PCB is bilaterally symmetrical; the inductor L1, the inductor L2, the inductor L3 and the inductor L4 share one double-hole magnetic core. A large number of grounding through holes are adopted in the PCB, the grounding effect is improved, and the directional couplers arranged on the PCB are arranged in a bilateral symmetry mode, so that stray capacitance and inductance generated by a left bonding pad and a right bonding pad are equal, and later product manufacturing is facilitated; and a double-hole magnetic core is adopted, so that the size of the product is reduced by 10 * 7.6 * 5.1 mm.

The application discloses a K-band transit-time oscillator based on a last pre-cavity extraction structure, which comprises an inner cylinder and an anode outer cylinder sleeved outside the inner cylinder, a circular annular cavity is formed between the inner cylinder and the anode outer cylinder, the cavity comprises a first drift tube, a first modulation cavity, a second drift tube, a second modulation cavity, a third drift tube, an extraction cavity and a first coaxial output waveguide which are sequentially communicated, the output end of the anode outer cylinder is further provided with a circular annular second coaxial output waveguide, the first coaxial output waveguide and the second coaxial output waveguide are coaxially arranged, the second modulation cavity is further communicated with the second coaxial output waveguide, and the K-band transit-time oscillator is rotationally symmetrical about the central axis of the inner cylinder. The application verifies the feasibility of extracting microwave by the last pre-cavity, and realizes higher efficient output and higher power output.

The utility model relates to the technical field of radar antennas, in particular to a multi-port waveguide slot antenna, which comprises an antenna plate, the antenna plate comprises a radiation layer positioned on the upper layer, a middle layer positioned in the middle and a network layer positioned on the lower layer, and the antenna plate is provided with a radiation antenna unit. The radiating antenna unit comprises a long-distance receiving antenna, a short-distance receiving antenna, a short-distance transmitting antenna and a long-distance transmitting antenna; compared with the prior art, the utility model has the advantages that the model selection and design simulation of the antenna, the network design simulation and the sensitivity analysis are completed; the method comprises the following steps of: evaluating processes such as antenna material selection, structural grinding tool processing, assembling and surface treatment, reasonably layering the waveguide slot antenna, manufacturing a complex 3D model at one time in an injection molding manner, and metallizing the plastic surface by utilizing a plastic electroplating process, so as to obtain the waveguide slot antenna. And after plastic metallization, the electrical performance of the antenna is consistent with that of metal, so that the weight of the product is greatly reduced, and the machining cost is saved.

The utility model discloses an intelligent mower with an automatic tracking device, and relates to the field of intelligent agricultural production, in particular to the field of intelligent weeding in orchards. The intelligent mower comprises a Slam automatic tracking control device, a cutter lifting control device, a driving device, a shell and a chassis. The Slam automatic tracking control device is installed on a mower chassis through a supporting frame. The cutter lifting control device is mounted at the front end of the mower chassis through a bolt, and the cutter lifting control device realizes height adjustment of a blade through movement of a lead screw mechanism; the driving device comprises four tires which are symmetrically installed on the two sides of the chassis. And the shell is connected to the chassis through a shell fixing piece. The intelligent mower can achieve the functions of path planning, automatic tracking and adjustment of the mowing stubble height. According to the technical scheme, the problems that the intelligent degree of orchard agricultural production is low, and an existing orchard mowing machine is low in efficiency and large in manpower consumption are solved.

This invention discloses a broadband multi-stage Gysel power divider based on IPD technology, comprising a microstrip structure layer, first and second dielectric substrates, and a grounding metal layer. The microstrip structure layer adopts a multi-layer nested structure, with each nested layer consisting of cascaded multi-stage Gysel power distribution units, disposed on the upper surface and inside the first dielectric substrate, forming an integrated layout based on IPD technology. This layout integrates a planar spiral structure, air bridges, parallel plate capacitors, thin-film resistors, and a layered grounding unit structure. The planar spiral structure is equivalent to a specific characteristic impedance transmission line; the air bridge structure solves crosstalk and suppresses parasitic capacitance; the parallel plate capacitor structure calibrates its equivalent reactance parameters; the thin-film resistor effectively improves port isolation and heat dissipation; and the layered grounding unit structure enhances heat dissipation and grounding reliability. This invention can achieve stable power distribution over a wide frequency band, adapting to the integration requirements of high-frequency, high-power, and miniaturized RF front-ends.

The present invention discloses a low-cost passive phased array antenna, which belongs to the technical field of microwave millimeter wave antennas. The phased array antenna adopts a modular design, and is composed of a radiation module, a phase shifting module and a feeding network. In the phase shifting module, a dielectric loaded phase shifter is proposed: that is, by opening a non-radiation slot on the axis of the wide surface of the rectangular waveguide, and then loading a dielectric thin plate through the non-radiation slot, the penetration depth of the dielectric thin plate is controlled by a micromotor / micromotor of a phase adjustment device, thereby changing the transmission phase of the rectangular waveguide. The dielectric loaded phase shifter is further used in the design of a phased array antenna: after integrating the radiation module and the feeding network, the beam scanning is completed by adjusting the loading depth of the dielectric plates in different channels in real time. The present invention is suitable for applications where the scanning angle requirements are not too high, but the power capacity and cost requirements are relatively high.

The invention discloses a two-stage conversion asymmetric bipolar pulse micro-arc oxidation power supply, which comprises a first-stage conversion module, a second-stage conversion module and a full-bridge inversion module, and is characterized in that the first-stage conversion module is connected with the second-stage conversion module, and the second-stage conversion module is connected with the full-bridge inversion module, the first-stage conversion module is used for converting input alternating current into high-voltage direct current, the second-stage conversion module is used for converting the high-voltage direct current into low-voltage direct current, and the full-bridge inversion module is used for converting the low-voltage direct current into bipolar pulses. The system can meet the requirement of large-scale industrial production, and is high in control precision, fast in dynamic response, small in output loss, low in cost and high in system reliability.

This invention relates to the field of radio frequency (RF) microwave communication, and particularly to an RF burn-out protection circuit and a high-power RF switch. The RF burn-out protection circuit of this invention includes a first 3dB coupler, a second 3dB coupler, a first parallel unit, a second parallel unit, a first matched load, a second matched load, a first RF circuit, and a second RF circuit. The RF burn-out protection circuit and high-power RF switch of this invention have high power capacity, low insertion loss, high isolation, stable VSWR performance, and are flexible in application and low in cost, possessing broad application prospects and value.

The present invention discloses a low-profile two-dimensional beam scanning array antenna, which relates to the technical field of array antennas. The array antenna includes a resonator antenna ERA body located at the lower side, the antenna body includes a partially reflecting surface PRS, a bottom layer all-metal phase correction structure is fixed on the upper side of the partially reflecting surface PRS, a middle layer all-metal phase correction structure is fixed on the upper side of the bottom layer all-metal phase correction structure, a top layer all-metal phase correction structure is fixed on the upper side of the middle layer all-metal phase correction structure, the distance between the bottom layer all-metal phase correction structure and the partially reflecting surface PRS is λ0 / 4, and the distance between the all-metal phase correction structures is λ0 / 3. The array has the advantages of simple antenna structure, low cost, large power capacity, etc., and the antenna phase uniformity is significantly improved.