90results about How to "Improve electrical performance indicators" patented technology

The invention discloses a process for preparing rare earth oxide doped ZnO-Bi2O3 family pressure-sensitive ceramic slurry, which comprises the following components (by molar portion): ZnO 91-98%, Bi2O3, Cr2O3, Co2O3, Ni2O3, MnCO3 and SiO2 each 0.1-1.0%, H3BO3 0.01-0.2%, Al(NO3)3 * 9H2O 0.001-0.01%, Sb2O3 0.5-2%, rare-earth oxide Ce2O3 or Gd2O3 0.1-1.0%.

The invention provides a satellite-based helical antenna. The antenna comprises a baffle board, an insulating board, a base, a helical antenna body and a protective cover. The baffle board, the base and the insulating board are fixed through screws. The insulating board is pressed between the baffle board and the base. The baffle board, the base and the insulating board are fixed as a whole. The lower end of a helical antenna body is fixed on the insulating board and the upper end thereof is fixed in the protective cover. When the helical antenna body is compressed to the greatest extent, the protective cover fully covers the base and the helical antenna body and is connected and fixed with the base through the screw. The helical antenna can be folded into a small size and has high compression ratio, the compressed antenna is convenient to store and install, has strong strength, and can bear large impact load; and the compressed antenna has no irreversible deformation, and can rapidly recover to the virgin state after being released.

The invention relates to a thickness design method of a radome. The method includes following steps: (1) performing discretization on the thickness of the radome according to the height direction of a radome body; (2) determining the value range of the thickness value, and giving an initial value to the thickness at a discrete point; (3) calculating a statistical value thereof according to the thickness value of the discrete point; (4) calculating a far field of an antenna, and extracting electrical performance indexes such as the gain G1 and the main beam position B1; (5) calculating a transmission coefficient of the random body, shown in the description, by employing a transmission line theory; (6) calculating a far field F' (theta, phi) of an antenna system with the radome, and drawing a far-field directional diagram; (7) establishing an optimization design model; and (8) determining whether the electric performance indexes and the thickness distribution of the random after optimization satisfy a preset requirement. According to the method, the electrical performance indexes of the radome are improved.

The invention discloses an SMA radio frequency coaxial connector, relating to the technical field of coaxial connectors and aiming to promote the electric characteristics and the mechanical reliability and reduce contact resistance and radio frequency leakage. The connector comprises a left support, a right support, an outer conductor and an inner conductor, wherein the outer conductor is formed by jointing a left outer conductor with a right outer conductor, and the right end of the left outer conductor is jointed with the left end of the right outer conductor; the left support, the right support and the inner conductor are all fixed in an inner cavity of the outer conductor; the left support and the right support are respectively sleeved at the left end and the right end of the inner conductor, the left end and the right end of the left support are respectively arranged against the left end inner wall of the left outer conductor and the inner conductor, and the left end and the right end of the right support are respectively arranged against the inner conductor and the right end inner wall of the right support; a radial inward boss is arranged on the left end inner wall of the left outer conductor, and a radial inward boss is arranged on the right end inner wall of the right outer conductor. The connector has little radio frequency leakage in the process of matching use.

The present invention belongs to magnetoelectricity field, especially relates to an inductor element and manufacturing method thereof. The inductive element includes a magnetic rod, coil winded on magnetic rod and coating body outer the coil, coating body is coated outer the coil with an integrated injection molding modus which is characterized in that: magnetic conduction powdered ratio is 75-90% (weight proportion) in coating body. The production method of the inductive element is: the combination between the coil and the magnetic rod are imbedded into prearranged mold of injection molding machine; magnetic conduction powder and other addition agent discharges from hopper and is heated to 80-350 EDG C for forming fluid after mixed in proportion, and is coagulating molding after shot into mold for equably fully coating the surroundings of the coil and the magnetic rod; the required inductive element is obtained after demoulding. The present invention overcomes technology prejudice always existing in the present field, can obtain an inductive element without interstice on coating body, if the coating performance of the inductive element coating layer is more better, more compete shielding structure can be obtained.

The invention discloses a radio frequency coaxial micro-strip connecting device. The radio frequency coaxial micro-strip connecting device comprises a coaxial micro-strip connector. The coaxial micro-strip connector comprises outer conductors, a first inner conductor and insulating supports arranged between the outer conductor and the first inner conductor. A first insulating support and a first outer conductor, the first insulating support and the first inner conductor, a second insulating support and the first inner conductor as well as the second insulating support and the second outer conductor are respectively fixed and assembled to each other through matched limit steps in the axial direction of the coaxial micro-strip connector. According to the radio frequency coaxial micro-strip connecting device, the coaxial micro-strip connector is fixed by using the mechanical limit steps rather than by being filled with epoxy resin glue for fixing the inner conductor and the outer conductors, so that the problems of electromagnetic leakage hidden danger and the like of an existing coaxial micro-strip connector are effectively solved.

The invention provides a current balanced flat copper wire wave winding armature winding comprising a U-phase winding, a V-phase winding and a W-phase winding. The three parallel branches of the U-phase winding enter from the first layer of the same corresponding slot of each pair of poles and exit from the first layer of the same corresponding slot of each pair of poles. The three parallel branches of the V-phase winding enter from the first layer of the same corresponding slot of each pair of poles and exit from the first layer of the same corresponding slot of each pair of poles. The threeparallel branches of the W-phase winding enter from the first layer of the same corresponding slot of each pair of poles and exit from the first layer of the same corresponding slot of each pair of poles. According to the current balanced flat copper wire wave winding armature winding, the temperature non-uniformity of the outer, intermediate and inner windings during load operation of the motor is improved when the three branches are connected in parallel, and the electric performance index of the motor is improved. The biggest characteristic is that the current of the three parallel branchesis completely balanced and there is no current amplitude and phase difference among the three branches during load operation of the motor so as to improve the overall performance of the motor.

The invention relates to a dual-frequency rotary joint used for S single frequency and X single frequency transmission, including an X frequency band joint and an S frequency band joint. The X frequency band joint mainly includes a circular waveguide, a rectangular waveguide and a short-circuit cylinder. The two ends of the circular waveguide are connected to each other, the rectangular waveguide is arranged on the side circular surface of the two ends of the circular waveguide, and the rectangular waveguide and the circular waveguide are connected to each other through the coupling hole; the S-band joint mainly includes a coaxial waveguide, two work points device, magic T and waveguide elbow, the coaxial waveguide and the circular waveguide are coaxially arranged, and are located outside the circular waveguide, forming a transmission channel between the coaxial waveguide and the circular waveguide, and the two power dividers are respectively located on the coaxial Both ends of the waveguide are connected to the transmission channel between the coaxial waveguide and the circular waveguide, and the two horizontal signal ports of the magic T are connected to the two signal ports of the two-power splitter through the waveguide elbow. The invention is a rotary joint capable of simultaneously transmitting high-power radio frequency signals of S and X frequency bands, so as to solve the requirement of dynamic transmission of uplink high-power signals of S+X dual-frequency co-constructed antennas.

The invention relates to a tree-shaped antenna, which comprises two feeding poles and more than three pairs of oscillators, wherein each pair of oscillators are in one step; the more than three pairs of oscillators are increased step by step from top to bottom; the upper ends of two feeding poles are connected to form a herringbone; each pair of oscillators are respectively and symmetrically installed on the two feeding poles; each pair of oscillators have the same structure but different sizes; the oscillators are one-stage fractons or two-stage fractons; each fracton comprises three fraction arms which are successively connected and are in the horizontal pole shape; the junction of adjacent fracton arms is provided with a vertically-upward fracton arm or a vertically-downward fracton arm; the lengths of the fracton arms are equal; one end of three successively-connected fracton arms is connected with one feeding pole, and the other end is connected with a one-stage loading metal bar. According to the tree-shaped antenna disclosed by the invention, the volume of the antenna is greatly reduced, the problem that the common metre wave log-periodic antenna can not be suitable to install on an airborne platform is solved, antenna cross coupling is lowered, and the electrical property can satisfy the system use requirement.

The invention belongs to the field of data acquisition. A four-path data acquisition system based on a single-chip microcomputer comprises the components of the single-chip microcomputer, an A/D converter, an analog multipath changeover switch, a data amplifier, a pressure sensor, a temperature sensor, a DC power supply, a memory expansion, a 8279 chip driver, a keyboard and an LED display device. The single-chip microcomputer communicates with the A/D converter, the memory expansion and the 8279 chip driver. The A/D converter is connected with the DC power supply and the data amplifier through the analog multipath changeover switch. The data amplifier is connected with the pressure sensor and the temperature sensor. The 8279 chip driver is connected with the keyboard and the LED display device. A main program in the four-path data acquisition system mainly finishes operations of initializing a programmable chip 8279, setting an operation manner or initial state, and initializing a serial interface.

The invention is suitable for the field of a filter and provides a radio-frequency filter and a duplexer. Two resonance modes are mixed in the radio-frequency filter, thereby greatly reducing the size of the filter, lowering the manufacturing cost of the filter and still acquiring higher electrical property and ultrahigh power capacity.

The invention discloses a packaging structure and a packaging method of a gallium nitride HEMT, a grid electrode of a gallium nitride HEMT chip to be packaged is located between a source electrode and a drain electrode, a second conductive bonding pad, a third conductive bonding pad and a base plate pin area are arranged and located on one side, close to the source electrode, of the chip, and a first conductive bonding pad is located on the other side, close to the drain electrode, of the chip; the first electric connection part is electrically connected with the drain electrode and the first conductive pad, the second electric connection part is electrically connected with the source electrode and the base plate pin area, the fourth electric connection part is electrically connected with the source electrode and the second conductive pad, and the third electric connection part is electrically connected with the grid electrode and the third conductive pad, so the voltage-withstanding distance between the electrodes of the chip can be met; the fourth electric connection part is electrically connected with the source electrode and the second conductive bonding pad to form a Kelvin source electrode so as to reduce the parasitic inductance of the driving loop; the gallium nitride HEMT chip to be packaged is fixed and electrically connected to the heat dissipation area, so the heat dissipation performance of the packaging structure is improved.

The invention discloses a high-precision radio frequency coaxial connector which relates to the technical field of coaxial connectors and solves the technical problems of improving electrical characteristics and mechanical reliability, reducing processing techniques and reducing processing cost. The connector comprises a support, an outer conductor and an inner conductor, wherein the outer conductor is formed by jointing a left outer conductor and a right outer conductor; the support is arranged in the outer conductor and is located at the joint part of the left outer conductor and the right outer conductor; the inner conductor is inserted in the outer conductor and penetrates through the support; and the support is columnar, both sides of the support are respectively provided with a left inner conductor compensation tank and a right inner conductor compensation tank around the periphery of the inner conductor, a left outer conductor compensation tank is located on the inner wall of the left outer conductor, and a right outer conductor compensation tank is located on the inner wall of the right outer conductor. The connector provided by the invention has excellent electrical characteristics, high mechanical reliability, simple processing technique, low processing cost and high product qualification rate.

The invention applies technique of activation and recovery to lead acid battery by using activator and activating instrument. Having high frequency impulse power supply, the activating instrument can send out high frequency impulse in frequency identical to natural frequency of molecule of compound sulfuric acid. The invention solves technical difficulties of low degree of recovery if the activator and activating instrument is applied solely in prior art. The invention is mainly applied to activation and recovery for each sort of lead acid battery (set).

The invention relates to a coaxial bunched cable for 3G (third generation) communication. The coaxial bunched cable comprises a physical foaming polyethylene insulating layer, an aluminum composite tape outer conductor, a tinned copper braid shielding layer and a photothermal-resistant polyethylene protective sheath which are arranged on the exterior of an inner wire of a copper-clad aluminium wire in sequence and also comprises a chemical foaming polyethylene padding core, a non-woven fabric inner protective layer, a cotton yarn tearing rope and a photothermal-resistant polyethylene outer protective sheath, wherein chemical foaming polyethylene padding cores are respectively arranged among four coaxial cables and are twisted together, the exterior of the cables are provided with the non-woven fabric inner protective layer and the photothermal-resistant polyethylene outer protective sheath, and the cotton yarn tearing rope is arranged between the non-woven fabric inner protective layer and the photothermal-resistant polyethylene outer protective sheath. The coaxial bunched cable provided by the invention has the characteristics of stable electric performance index, compact structure and simplicity and convenience in installation and construction, thus the electric performance index of the cable can be ensured not to change along with the change of installation places.

The invention discloses a universal reconfigurable phased-array antenna test truss. The truss comprises a support frame, a pitching adjusting mechanism and a truss structure. The truss structure comprises a plurality of trusses and a plurality of antenna fixing mechanisms. Horizontal sliding grooves which are vertically spaced and parallel are formed in the side face of the truss. Every two adjacent trusses are fixedly connected through a quick disassembly assembly, so that the horizontal sliding grooves of every two adjacent trusses are connected. Each antenna fixing mechanism is vertically arranged between the two corresponding horizontal sliding grooves, the end portions of the antenna fixing mechanisms are connected with the horizontal sliding grooves in a sliding mode, the lower endsof the trusses are hinged to the supporting frame, the two ends of the pitching adjusting mechanism are connected with the trusses and the supporting frame respectively, and the pitching adjusting mechanism can drive the truss structure to rotate relative to the supporting frame. The test truss can be suitable for testing various types of phased-array antennas.

The invention discloses a T-junction waveguide duplexer, which comprises an E-T power divider. The output end of the E-T power divider is connected with filters with different passbands; and the common end of the power divider is provided with a tuning bulge. Each filter is provided with metal diaphragms at intervals. The T-junction waveguide duplexer is simple in structure and easy to manufacture, solves the problem of large span of two working frequency bands of the duplexer, and improves the electrical performance index under the premise of keeping the basic performance index of the duplexer.

The invention provides a broadband and low-fluctuation band-pass LC filter. According to the filter, ordinary inductors are replaced by winding magnetic rings with small temperature drift, good stability, and high Q value, and 0805 packaging capacitors are employed so that the stability of electrical parameters is guaranteed, and the electrical performance index of the filter is greatly increased. Penetrating holes are arranged at four corners around a PCB so that input, output, and grounding signals can all be perfectly transmitted to the PCB and components. Besides, a transfer function expansion equation of the filter is designed based on the design principle of in-band fluctuation, standing waves, and optimal dimension, and the capacitors and the winding magnetic rings are arranged strictly according to the equation so that the filter is advantaged by small packaging, large bandwidth, low insertion loss, high rectangular degree, high stop-band suppression, low standing wave, and low in-band fluctuation.

The invention relates to a method for preparing low-aromatic transformer oil by medium-pressure hydrogenation of naphthenic base distillate oil, which comprises the following steps: 1) the naphthenic base distillate oil enters a first hydrogenation reactor and passes through a hydrofining reaction zone and a deep dearomatization reaction zone to realize hydrogenation removal of sulfur and nitrogen compounds and hydrogenation saturation of aromatic hydrocarbon in the oil product; 2) enabling the reactant flow to enter a second reactor, and respectively passing through a selective ring-opening reaction zone, an isomerization pour point depression reaction zone and a finishing reaction zone to realize selective ring opening of a polycyclic compound, isomerization of paraffin (branched chain) and saturation of cracked olefin; and 3) carrying out gas-liquid separation and rectification separation on the reaction product to obtain a low-aromatic transformer oil fraction and a clean light oil fraction. The method is suitable for upgrading and value-added processing of the transformer oil base oil from naphthenic crude oil and coal-based oil product fractions, has the characteristics of simple process flow, small device investment scale and high operation safety, and has the technical advantages of high transformer oil base oil yield, good product quality, environmental friendliness and the like.