190results about How to "Improve high frequency characteristics" patented technology

The invention discloses a nickel-zinc soft magnetic ferrite material and a preparation method thereof. The material comprises the following compositions in mol percentage: 45 to 50 mol percent of ferric oxide Fe2O3, 20 to 26 mol percent of zinc oxide ZnO, 12 to 17 mol percent of nickel protoxide NiO, 5 to 10 mol percent of copper oxide CuO, and 3 to 10 mol percent of magnesium oxide MgO. The preparation method comprises the following steps: treating raw materials, proportioning, primary ball milling, drying, powdering or screening, preburning, secondary proportioning, secondary ball milling, secondary drying and secondary powdering or screening; the preburning condition is to carry out pre-synthesis in an air furnace at a temperature of between 900 and 980 DEG C, and the sintering temperature is between 1,050 and 1,100 DEG C. The nickel-zinc soft magnetic ferrite material has the characteristics of property of high Q, high frequency, high TC, high Bm and low cost.

The present invention discloses a sine DC variable frequency one-driving-multiple air conditioner control system, comprising an outdoor unit controller, at least three indoor units and a DC variable frequency compressor, wherein, the outdoor unit controller further controls an outdoor unit intelligent control module, an intelligent frequency conversion module, an indoor-outdoor unit communication module and a temperature acquisition module; the outdoor unit intelligent control module is used for controlling the drive of the DC variable frequency compressor. The present invention also discloses a sine DC variable frequency one-driving-multiple air conditioner control method, which first calculates the needed frequency of the DC variable frequency compressor, and then calculates the instantaneous position and the velocity information of a DC variable frequency compressor rotor, and finally drives the DC variable frequency compressor. The present invention increases the service efficiency of the compressors of one-driving-multiple air conditioners, improves the high frequency characteristics and low frequency characteristics of air conditioners, and ensures that one-driving-multiple air conditioners save more energy.

The invention discloses a core/shell-structure-containing Fe/SiO2 composite nano particles with high stability and its preparing process which comprises, using ferric salt as raw material, organic acid as complexing agent, absolute ethyl alcohol or isopropyl alcohol as dissolvent so as to form uniform non-aqueous gel, charging silicic acid ethyl acetate, evaporating and dehydrating to form gel, preparatory roasting in air to remove the organics, deacidizing at different temperature in H2 atmosphere.

The invention relates to a nickel-zinc ferrite material for wireless signal sensing, a sheet core and a preparation method thereof. The nickel-zinc ferrite material comprises main components which are calculated by the following oxides in mole percent: 48.0-62.5mol% of Fe2O3, 15.3-25.5mol% of NiO, 18.5-23.5mol% of ZnO and 3-10mol% of CuO; and the nickel-zinc ferrite material additionally comprises auxiliary components which are calculated by the following standard substances in weight percent relative to the total weight of the main components: 0.05-0.10wt% of nano CaCO3, 0.30-0.85wt% of nano SiO2, 1.50-2.50wt% of Mn3O4, 0.05-0.35wt% of Co2O3 and 1.00-1.50wt% of Bi2O3. The nickel-zinc ferrite material is prepared by adopting an oxidation method. The sheet core is a reticular sheet, the length is 45-250mm, the width is 45-250mm, the thickness is 0.05-0.3mm, the sheet core is formed by small sheets in a connecting way, the gaps among the small sheets are less than 50mum, and the sheet core is directly molded and then is sintered, or a magnetic bar is molded and then is sliced into small sheets which form the sheet core through an SMT (surface mount device) technology. At frequency of 13.56MHz, the material has the electromagnetic performance that mu' is equal to 125 plus or minus 20% and the mu'' is less than or equal to 4. Therefore, the material can satisfy the requirement of high-frequency low consumption on the ferrite material for wireless signal sensing.

The invention belongs to the technical field of particle accelerators and particularly relates to manufacture of a radio frequency superconductor cavity. A manufacturing method of the superconductor cavity mainly comprises the following steps: (1) using superconductor materials as raw materials, (2) utilizing CAD software to generate a superconductor cavity model, and adopting layering software to layer the superconductor cavity model, (3) using an atmosphere control system to provide argon for a forming chamber, (4) laying powder of superconductor materials in the step (1) on a forming table of the forming chamber, (5) using a scanning control system to print laser energy onto a powder layer according to the description of a software model of a superconductor cavity slicing layer so as to generate a superconductor material slicing layer entity. The entity is a part of the superconductor cavity. A next slicing layer is processed continually on the first slicing layer entity until the whole superconductor cavity processing process is finished. Finally, mechanical polishing, chemical washing, high-temperature annealing, high-pressure super-pure water washing and super-clean chamber assembly are conducted. The method shortens the development cycle of the superconductor cavity, improves the finished product rate of the development of the superconductor cavity due to the fact that the whole superconductor cavity is free of welding joints, is free of restriction of stamping forming conditions and capable of improving the performance of the superconductor cavity, and reduces product cost due to the fact that surplus superconductor material powder can be used repeatedly.

The invention discloses an AlGan material-based ultraviolet photoelectric detector structure and a manufacturing method thereof, which are mainly used for solving the problem of the dependence on a P-type doping material in the prior art. A detector comprises a substrate (1), a transition layer (2), a GaN buffer layer (3), an aluminum component gradual change AlGaN layer (4) and an active layer (5) from bottom to top, wherein the aluminum component gradual change AlGaN layer (4) is partitioned into an upper layer and a lower layer; the thickness of the lower layer is 20-30 nanometers, and thecontent of an aluminum component increases from 0 percent to 80-100 percent; the thickness of the upper layer is 10-20 nanometer, and the content of the aluminum component is 0-80 percent; the left upper side of the aluminum component gradual change AlGaN layer (4) is covered by the active layer (5); a bottom ohmic contact (7) is deposited on the right upper side of the aluminum component gradualchange AlGaN layer (4); a gap (8) is formed between the ohmic contact and the active region; the active region (5) consists of an AlGaN material with the aluminum component content of 0-80 percent; the thickness of the active region (5) is 50-100 nanometers; and a surface ohmic contact electrode (7) is deposited on the surface of the active region. The detector structure has the advantages of capability of automatically working in a photovoltaic mode, high high-frequency characteristic and small dark current, and can be applied to optical signal detection in ultraviolet wavebands between 226 nanometers and 363 nanometers.

The invention relates to a broadband online measurement sensor for DC extra-high voltage corona current, which comprises an isolation electrode unit, a signal processing unit and a system power supply unit, wherein the isolation electrode unit comprises an insulated isolation sleeve, a hollow tubular long arm low-voltage electrode and a hollow tubular short arm high-voltage electrode, wherein two ends of the insulated isolation sleeve are respectively in security isolation connection with the high-voltage electrode and the low-voltage electrode in a special way; the signal processing unit consists of a sampling resistor module, a signal acquisition module, a signal conversion module and a signal transmission module; the system power supply unit comprises a storage battery pack and a charging module; and the signal processing unit and the system power supply unit are arranged in the isolation electrode unit, so that the high-accuracy integral measurement sensor can be formed. The broadband online measurement sensor solves the problems of shielding disturbance of a strong electric field between an acquired signal and an acquisition channel as well as surrounding stray capacitance, and realizes the broadband domain online measurement and the multi-point network online measurement of the DC extra-high voltage corona current.

The invention discloses a silicon photonic optical transceiver module. The silicon photonic optical transceiver module comprises a circuit board and an optical component; the circuit board is arrangedin a hollow region, and the hollow region is used for accommodating the optical component; the circuit board is provided with a plurality of first bonding pads along the periphery of the hollow region; a plurality of second bonding pads are arranged at the edge of the optical component; and after the optical component and the circuit board are attached in a reverse mounting mode, the second bonding pads are attached to the corresponding first bonding pads so as to implement electrical connection. The electrical connection is established between the circuit board and the optical component by the first bonding pads and the second bonding pads, an electric signal connection path is short, a stray capacitance is small, high-frequency transmission loss is low, high-frequency characteristics are improved, and the problem of high-frequency inhibition caused by a gold-wire bonding wire currently can be effectively improved. Meanwhile, the optical component and the circuit board are attached in a reverse buckling mode, the design structure is compact, and the size of the silicon photonic optical transceiver module can be effectively reduced.

A planar magnetic inductor and a method for manufacturing the same are provided. The planar magnetic inductor comprises an insulating oxide magnetic layer formed on a substrate, a conductive coil separated from a lower surface of the insulating oxide magnetic layer while being completely embedded in the insulating oxide magnetic layer, and a cover layer formed on the insulating oxide magnetic layer for protecting the insulating oxide magnetic layer. The insulating oxide magnetic layer comprises a lower insulating oxide magnetic layer, and an upper insulating oxide magnetic layer formed on the lower insulating oxide magnetic layer, such that the conductive coil is completely embedded in the upper insulating oxide magnetic layer. The planar magnetic inductor can realize excellent high frequency characteristics and high inductance with a reduced scale.

The invention proposes a connector (400) for surface mounting to a circuit substrate, the connector comprises an insulator (420), a center conductor (410) centrically mounted to the insulator and a shielding shell (430) externally mounted on the insulator, the shielding shell comprises a first portion for connecting the shielding shell with a connector and a second portion for surface mounting the connector to the circuit substrate, the second portion includes a body (432) and a plurality of solder legs (431) formed on the body, wherein the body comprises a shielding portion (434) surrounding an extending portion of the center conductor and at least one opening (433) configured to communicate inner space between the center conductor and the shielding portion with outside space of the connector when the RF connector is soldered to the circuit substrate.

The invention discloses a method for manufacturing a polymer ethylenedioxythiophene (PEDT) cathode plate type tantalum electrolytic capacitor by a two-step method. The cathode plate type tantalum electrolytic capacitor is manufactured by adopting the two-step method. The two-step method is a method which comprises the following steps of: impregnating an oxidizing agent at the first time, impregnating a monomer at the second time, and polymerizing the oxidizing agent and the monomer to prepare PEDT so as to manufacture the cathode plate type tantalum electrolysis capacitor, wherein the whole process is performed under normal temperature. The manufacturing method comprises the following steps of: A, adding a certain amount of adhesive agent into tantalum powder, and stamping and molding themixture, sintering the treated mixture at high temperature to volatilize the adhesive agent and effectively adhere the tantalum powder so as to form a multi-hole tantalum anode plate, and applying direct-current voltage in acidic solution, so that the surface of the tantalum powder is oxidized to generate an amorphous dielectric layer Ta2O5; B, repeatedly immersing the anode plate with the dielectric layer in the oxidizing agent and monomer solution for reaction so as to form a conducting polymer PEDT layer with a certain thickness, namely a cathode; and C, immersing the anode block with the PEDT layer in graphite and silver slurry respectively, curing respectively at high temperature, and performing assembly, plastic package, aging test and labeling to package a capacitor product.

The invention relates to vibration diaphragm and a preparation method thereof. The vibration diaphragm comprises a base layer which is thin film made of any one material of polyetherimide, polyethylene glycol terephthalate, polyetheretherketone, polyphenylene sulfide and polyurethane; and a strengthened layer which is formed by drying and curing a mixture of graphene, graphite powder and glue, wherein the weight ratio of the graphene, graphite powder and glue in the strengthened layer is (1-2):(5-10):(9994-9988), and the strengthened layer is adhered on the surface of the base layer. The preparation method comprises the steps of providing the thin film, glue, graphite powder and graphene, evenly mixing the graphite powder and the graphene to form a first mixture, mixing the first mixture in the glue, evenly mixing to form a second mixture; and evenly coating the second mixture on the surface of the thin film and carrying out drying, thereby curing the second mixture on the surface of the thin film to obtain the final vibration diaphragm. According to the vibration diaphragm and the preparation method, the adhesion of the vibration diaphragm is high, the resonant frequency f <0> is reduced, the high frequency sound pressure is increased, and the high and low frequency characteristics are completed.

The invention relates to a method of making a Schottky diode T-type anode contact air bridge electrode, comprising the following steps: making a diameter-A anode contact hole in a lightly doped semiconductor material by means of photo-etching; making a diameter-B anode contact hole in the diameter-A anode contact hole in an overlay manner; forming T-type anode contact metal through an evaporative stripping process; forming air bridge lower glue by means of photo-etching; forming air bridge upper glue by means of photo-etching; forming air bridge metal through an evaporative stripping process; and connecting the T-type anode contact metal with an anode electrode plate, thus completing the making of a Schottky diode T-type anode contact air bridge electrode. The advantage is that by using the method of making a T-type anode air bridge electrode, the parasite capacitance of anode electrodes can be reduced effectively, and the cutoff frequency of Schottky diodes can be improved.

The invention belongs to the field of metal soft magnetic material manufacturing, and particularly relates to a method for manufacturing a modified silicon iron boron soft magnetic powder core with magnetic conductivity of 90. The method comprises the first step of embrittlement treatment, the second step of crushing, the third step of screening and matching, the fourth step of passivating treatment and insulation covering, the fifth step of modifying agent adding, the sixth step of compression moulding and the seventh step of annealing treatment and spraying. According to the method, the noise defect of the silicon iron boron soft magnetic powder core can be overcome, and the high-frequency performance of the silicon iron boron soft magnetic powder core can be improved.

A solid electrolytic capacitor includes a capacitor element, an anode terminal, a cathode terminal, and an outer casing resin. The anode and cathode terminals constitute parts of the mounting surface, and are drawn immediately below the capacitor element. The anode terminal and the cathode terminal are electrically coupled with an anode leader of the capacitor element and a cathode layer, respectively. The outer casing resin covers the capacitor element, and exposes the anode and cathode terminals on the mounting surface. At least one recess is provided on a mounting surface side of at least one of the anode and cathode terminals having a larger area projected onto the mounting surface.

The invention discloses an active high-pass wave filter amplification circuit, which relates to an amplification circuit, in particular to an improved structure of the active high-pass wave filter amplification circuit. The invention provides the active high-pass wave filter amplification circuit with good high-frequency characteristic. The active high-pass wave filter amplification circuit comprises a triode, a current source, a resistor and a capacitor.