54results about How to "High impedance characteristic" patented technology

An RFID chip package includes an RFID chip including a voltage booster circuit and processing an RF signal in a UHF band and a power supply circuit connected to the RFID chip and including at least one inductance element. A reactance component of an input / output impedance at an antenna-connecting input / output terminal of the power supply circuit is substantially 0Ω.

This invention can obtain a stable impedance characteristic by improving reliability of connection of a grounding terminal and an external conductor, to attain improvement in manufacturing and equalization of the impedance characteristic between products by entirely eliminating soldering process, to make thinning available, and to prevent that the grounding terminal and the external conductor cause poor connection by making secondary mold. It is the electric connector 100 used for connection of shield cables 200, which have signal wires 210 and grounding wires 220. The first housing 120 is primarily molded to the external conductor 110, and a support projection 113, which contacts the grounding terminal 140 by projecting to the inner side of the external conductor 110, is formed. At the position, which faces the support projection 113 through the grounding terminal 140 in the second housing 160 which is secondarily molded, a through hole 161, which is made of a core pin 341 that has carried out pressing of the grounding terminal 140 by projecting into the inner direction from a mold 310, is provided.

The invention discloses a low-voltage-difference linear voltage stabilizer. The voltage stabilizer comprises an error amplifier (10), a voltage follower (20), an output circuit (30) and a compensation circuit (40). The output end of the error amplifier (10) has the high impedance characteristic, a pole p1 is formed at the output end, the output end of the error amplifier (10) is connected with the input end of the voltage follower (20), parasitic capacitance of the output end of the error amplifier is reduced, so the formed pole is far away from the original point, and the pole p1 is compensated for through a first compensation unit; besides, the compensation circuit (40) compensates a pole p2 formed by the grid electrode of a compensation power tube MP301, stability of loops in a full-load range is guaranteed in the compensation mode, accordingly influences of the pole of the error amplifier on the PSRR are eliminated, and characteristics of the PSRR are improved. An LDO circuit effectively expands the bandwidth of the loops, transient characteristics are improved, and a circuit implementation mode is simple.

The invention relates to a high-impedance broadband soft magnetic ferrite material, a magnet ring and a preparation process thereof. The high-impedance broadband soft magnetic ferrite material is prepared from the following raw materials in weight ratio: 63-65 of Fe2O3, 8-10 of NiO, 21.5-23 of ZnO, 3-5 of CuO and 0.5-1.0 of Co2O3. The technical characteristics of the high-impedance broadband inductor magnet ring made of the material and the process thereof reach or exceed the level of a similar product of the Japanese TDK Corporation. Test results show that the impedance at low frequency end (10 MHz) is not less than 100 ohm and is equivalent to the product of the Japanese TDK Corporation; the impedance at high frequency end (500 MHz) exceeds 300 ohm, and the impedance is greater than that of the product of the Japanese TDK Corporation starting from 150 MHz.

The invention relates to a Mn and Zn ferrimagnetism material and a preparation method thereof. The Mn and Zn ferrimagnetism material is made of principal ingredients and subsidiary ingredients. The weight percentages of the principal ingredients which are oxides are calculated as follows: Fe2O3 accounts for 61 percent to 75 percent by weight; ZnO accounts for 12 percent to 30 percent by weight; the rest principal ingredient is Mn3O4. The subsidiary ingredients are one or a plurality of kinds of CaCO3 accounting for 0 to 300ppm by weight; SiO2 accounting for 50ppm to 250ppm by weight; Bi2O3 accounting for 0 to 500ppm by weight. The Mn and Zn ferrimagnetism material has both high magnetic permeability and high impedance.

The invention relates to the field of electrical connectors, in particular to a coaxial connector and a plug and a socket thereof. The coaxial connector comprises the plug and the socket, wherein the plug comprises an outer plug conductor and a connection nut; the connection nut is rotationally assembled on the outer plug conductor; the socket comprises an outer socket conductor; the outer plug conductor is provided with an insertion part which is used for inserting of the outer socket conductor; a set distance is formed between the outer wall surface of the insertion part and the inner wall surface of the connection nut; a thickening part is arranged on an outer layer of the insertion part; expansion parts matched with the thickening part are arranged in holes of the outer socket conductor and the connection nut; the set distance is the distance between the outer side surface of the thickening part and the inner wall surface of the expansion part in the hole of the connection nut; and an outer thread matched with the connection nut is formed in the outer socket conductor. By the coaxial connector, the strength, the reliability and the characteristic impedance can be improved under the condition of not increasing the boundary dimension of the SMA radio-frequency coaxial connector and reserving the mechanical property and the environmental resistance of the SMA connector.

The invention discloses a device and method for measuring frequency domain impedance of a traction power supply system and capable of setting a frequency band. According to the main structure of the device, a secondary side coil of a step-down transformer (T) is connected in series with a switch (K) and then connected with a disturbance circuit; a microprocessor unit (MPU) is connected to gate pole of an IGBT device in the disturbance circuit through a drive circuit (DC); and the disturbance circuit is mainly composed of the step-down transformer, a diode, the IGBT device and a resistor. The device for measuring frequency domain impedance of the traction power supply system can measure the frequency domain impedance characteristic of the traction power supply system in a set frequency band. The frequency domain impedance measurement of the traction power supply system is carried out by using the device, and the measurement data processing amount is small, the measurement efficiency ishigh, the measured impedance characteristic and resonance frequency precision are high, and the device is more accurate and reliable.

The invention discloses a transmitting line in the circuit testing point, which is characterized by the following: the transmitting line is set on the printing circuit board, which has at least one internal circuit testing point to provide circuit measurement; one first line segment with first line length and first line breadth is set at least one side of internal circuit testing point, which connects the transmitting line; the transmitting line lies on at least one second line segment with second line length and second line breadth to mate part of line segment of at least one side of internal circuit testing point; the second line segment connects the internal circuit testing point and the first line segment. The invention utilizes resistance to mate optimum line length and line breadth, which makes partial line segment display high resistant property.

The present invention relates to a packaging structure used for integrating surface adhesive type assembly, which is used for integrating and packaging the surface adhesive type assemblies (such as a combination of an electronic assembly, a driving / driven assembly, a radio frequency module, an integrated circuit chip, a chip antenna or other surface adhesive type assemblies) by vacuum hot-pressing technology. The structure includes a dielectric substrate, a first surface metal layer arranged on a top surface of the dielectric substrate, a second surface metal layer arranged on an lower surface of the dielectric substrate, a plurality of plated-through-holes arranged in the dielectric substrate and used for electrically connecting the first surface metal layer and the second surface metal layer, an electronic assembly adhered to the first surface metal layer, and a packaging rubber sheet covered on the top surface of the dielectric substrate and used for sealing the first surface metal layer and the electronic assembly adhering thereto. The packaging structure used for integrating surface adhesive type assembly provides the function of bearing and structure protection, and ensures a normal transmission of signals and energy.

An RFID chip package includes an RFID chip including a voltage booster circuit and processing an RF signal in a UHF band and a power supply circuit connected to the RFID chip and including at least one inductance element. A reactance component of an input / output impedance at an antenna-connecting input / output terminal of the power supply circuit is substantially 0Ω.

The invention relates to an implementation method of a high-efficiency Doherty power amplifier based on a switching resonant structure. The switching resonant structure for inhibiting the higher harmonic component of an auxiliary power amplifier is arranged behind the auxiliary power amplifier so that the auxiliary power amplifier realizes class E work; the switching resonant structure comprises a switch, and a resistor, a capacitor and an inductor, the three of which are connected with the switch; an inductance value is optimized to enable a signal to resonate under a fundamental frequency, and therefore, a high impedance characteristic is presented to harmonics and an orthogonal relation between the time domain voltage and the current waveform of an ideal class E amplifier is realized. As a result, the efficiency of the Doherty power amplifier is greatly improved under a high linearity condition. The inductance value of the novel switching resonant structure decides the working frequency thereof; the inductance value in the switching resonant structure is reasonably calculated, and meanwhile, the implementation of a zero-current switch of the class E power amplifier is considered to guarantee the implementation of high efficiency performance of the power amplifier within a working frequency range.

The invention relates to a very high frequency (VHF) band communication short antenna, which solves the problems of overlong length, inconvenience in packaging, transportation and use, non-ideal electrical performance, low gain, large standing wave and narrow frequency band of an antenna of VHF communication equipment in the prior art. The VHF band communication short antenna comprises a cable and an oscillator, wherein the cable is provided with an inner conductor and an outer conductor; the oscillator is electrically connected with the inner conductor of the cable through a matching network; a choking sleeve electrically connected with the outer conductor of the cable is arranged at the outer part of the cable; a plurality of spokes are arranged at the lower end of the choking sleeve; and the oscillator is in a helical structure. The structures of the normal direction radiated short helical radiation oscillator, the feed choking sleeve and the umbrella rib-shaped spokes are integrated into the VHF band communication short antenna, so the height of the antenna is reduced, and the packaging, the transportation and the use are facilitated; and meanwhile, the antenna has the advantages of high gain, small standing wave and wide frequency band.

A decoupling structure among multi-input-multi-output antennas comprises a dielectric substrate and a patch, wherein the patch is arranged on the dielectric substrate and comprises an enclosed rectangular ring, a swastika-shaped structure and / or inverse swastika-shaped structure and a U-shaped strip line structure, wherein the enclosed rectangular ring is arranged on the dielectric substrate, theswastika-shaped structure and / or inverse swastika-shaped structure is embedded into the rectangular ring, the rectangular ring is connected with one end of the U-shaped strip line structure, and the swastika-shaped structure and / or inverse swastika-shaped structure is embedded into a gap of the U-shaped strip line structure. With the adoption of a mode that an inner structure and an outer structure are embedded, resonant property with high impedance characteristic is formed, the decoupling structure is simple and integrates with the multi-input-multi-output antennas, and the whole profile of the decoupling structure is relatively low; the structure is reasonable in layout, the space resource is reasonably utilized, integrated design of a wireless communication system terminal is easy to achieve, and installation and debugging are facilitated; and the structure has relatively small size and is easy to integrate with mobile terminal equipment, the resonant frequency can be conveniently adjusted very well, and the effect of preventing required interference is achieved.

The present invention describes a system, apparatus, and method for detection of disconnection of a device from a patient, such as dislodgment of a device during medical treatments or therapies, using a patient's electrical voltages.

The invention relates to a Mn and Zn ferrimagnetism material and a preparation method thereof. The Mn and Zn ferrimagnetism material is made of principal ingredients and subsidiary ingredients. The weight percentages of the principal ingredients which are oxides are calculated as follows: Fe2O3 accounts for 61 percent to 75 percent by weight; ZnO accounts for 12 percent to 30 percent by weight; the rest principal ingredient is Mn3O4. The subsidiary ingredients are one or a plurality of kinds of CaCO3 accounting for 0 to 300ppm by weight; SiO2 accounting for 50ppm to 250ppm by weight; Bi2O3 accounting for 0 to 500ppm by weight. The Mn and Zn ferrimagnetism material has both high magnetic permeability and high impedance.

The invention discloses a soft magnetic ferrite material with electromagnetic shielding performance. The soft magnetic ferrite material is prepared from the following raw materials in parts by weight: 60-65 parts of hydroxy iron powder, 10-15 parts of ferric oxide, 25-27 parts of manganese oxide, 21-23 parts of zinc oxide, 4-5 parts of silane coupling agent kh570, 5-7 parts of organic silicon resin, 1-2 parts of polyvinyl alcohol, 7-9 parts of sodium silicate, 0.5-0.6 part of ferrocene powder, 0.3-0.4 part of straw ash, 0.4-0.5 part of potassium permanganate and a right amount of water. The soft magnetic ferrite material has the advantages of simple preparation method, reasonable technique and low cost. The prepared magnetic core material has the advantages of favorable electromagnetic shielding performance, favorable heat shock resistance, favorable use effect, long service life and the like, and can not be easily damaged.

A high impedance bicone antenna system supporting ultra wideband operation. The antenna may comprise a reduced aperture size and reduced half-angles of the conductive cones forming the antenna. Reduction in cone angles may increase the impedance of the cones. An impedance matching mechanism for interfacing to the high impedance bicone may be positioned within one of the cones by a dielectric material. The impedance matching mechanism may be a flat conductive taper functioning as an impedance matching transmission line between an external feed line and the antenna. The conductive taper may function as a center conductor of a coaxial feed mechanism where the inside of the cone around the taper serves as the outside conductor, or return, of the tapered feed. The geometry of the cones may be modified to provide one or more end segments that are substantially cylindrical.

The invention discloses high-frequency anti-interference manganese zinc ferrite and a preparation method thereof. The high-frequency anti-interference manganese zinc ferrite comprises a main materialand an auxiliary material, wherein the auxiliary material comprises CaO, nano-grade BaTiO3, Bi2O3, Nb2O5, HfO2 and Co2O3. The preparation method comprises steps of material mixing, pre-sintering, auxiliary material mixing, molding and sintering, wherein material mixing is implemented in a mode of pulping raw materials, performing ball milling, grinding and mixing, and implementing a spray drying mode so as to obtain a powder material. By adopting the mode, the doping and mixing uniformity of raw materials and auxiliary materials can be improved, the Curie temperature of an original 12K material can be increased to 125 DEG C from 115 DEG C, the adaptability of a product to a working environment can be effectively improved, a good impedance characteristic can be achieved, EMC (Electro Magnetic Compatibility) safety requirements can be met, and the use demand of interference prevention at a high-frequency working section of 10-40MHz can be met.

The invention relates to an HDI board fabrication method. The method comprises the steps of substrate cutting, inner-layer circuit, inner-layer AOI, resin silk-screen, resin grinding, shooting, laserdrilling, mechanical drilling, copper deposition, electroplating and post process. In the circuit board fabricated by the method, the dielectric thickness requirements of different clients can be met,and the dielectric thickness can be flexibly adjusted and is uniform; meanwhile, the method is short in fabrication process and high in efficiency, and the cost is greatly reduced compared with a traditional lamination process; better dielectric performance can be obtained, the impedance characteristic of the circuit board particularly an HDI board is improved, so that the circuit board has favorable signal transmission performance, and the high-frequency and high-speed requirement of the client is met.

The invention relates to the field of conductive composite materials and discloses a method for preparing a field reversible nonlinear conductive composite material, the material prepared by the method and application of the material. The method includes weighing AgNWs, adding the AgNWs into absolute alcohol, adding TGA, stirring the mixture, then adding TBT, fully mixing the mixture, then heatingthe mixture to 180-210 DEG C, reacting the mixture for 9-11 h, performing centrifugation to obtain precipitate, and washing the precipitate to obtain AgNWs@TiO2; weighing PVA and water, stirring themixture, heating the mixture to 85-95 DEG C and stirring the mixture until the PVA is dissolved to obtain a solution G; weighting the AgNWs@TiO2, adding the AgNWs@TiO2 into the solution G, stirring the solution at 60-70 DEG C for 10-15 h to obtain a composite material fluid, and performing casting to form film, then the field reversible nonlinear conductive composite material can be obtained afterthe solvent is volatilized. The mass ratio of the AgNWs, the TGA and the TBT is 100:210-220:20; the degree of polymerization of the PVA is 1750 + / - 50, and the alcoholysis degree is 99%; and the massratio of the PVA to the AgNWs@TiO2 is 60:30-50. The method has characteristics including a simple process, a low cost, short reaction time and easy preparation in a large scale. The prepared composite material is uniform in distribution, good in dispersibility and free of agglomeration, and can be applied in overvoltage protection, lightning stroke surge and self-adaption electromagnetic pulse protection fields.

The invention provides an electronic component capable of improving an impedance characteristic. The electronic component includes: a laminated body in which a bottom surface side extraction electrodelayer, a primary coil conductor layer, a secondary coil conductor layer, a tertiary coil conductor layer, a parallel primary coil conductor layer, and an upper surface side extraction electrode layerare laminated in order; and first to sixth external electrodes arranged on the surface of the laminated body, wherein the primary coil conductor is connected to the first and fourth external electrodes; the secondary coil conductor is connected to the second and fifth external electrodes; the tertiary coil conductor is connected to the third and sixth external electrodes; the parallel primary coil conductor is connected to the first and fourth external electrodes; the primary coil conductor is connected in parallel with the parallel primary coil conductor; and the via conductors disposed inside the coil pattern are formed in all of the coil conductor layers constituting the laminated body, and the maximum number of the via conductors inside the coil pattern is two.

A high impedance bicone antenna system supporting ultra wideband operation. The antenna may comprise a reduced aperture size and reduced half-angles of the conductive cones forming the antenna. Reduction in cone angles may increase the impedance of the cones. An impedance matching mechanism for interfacing to the high impedance bicone may be positioned within one of the cones by a dielectric material. The impedance matching mechanism may be a flat conductive taper functioning as an impedance matching transmission line between an external feed line and the antenna. The conductive taper may function as a center conductor of a coaxial feed mechanism where the inside of the cone around the taper serves as the outside conductor, or return, of the tapered feed. The geometry of the cones may be modified to provide one or more end segments that are substantially cylindrical.

The invention discloses a broadband high-impedance manganese-zinc ferrite material. The material comprises a main component and an auxiliary component, the main component comprises Fe2O3, ZnO and Mn3O4 (in terms of MnO), and the auxiliary component is selected from at least one of SiO2, CaCO3, Nb2O5, Co2O3 and TiO2. The manganese-zinc ferrite material has the direct-current resistivity of above 3000 ohm.m, the Curie temperature of above 210 DEG C, the normal-temperature saturation magnetic induction intensity of above 440 mT and the initial permeability of above 650, and also has the characteristic of high impedance in a broadband range of 0.01-700 MHz.

The invention discloses a signal processing circuit and method. The circuit comprises a signal source which is used for providing a source signal; an amplifier which is connected with the signal source and amplifies the source signal; a zero-setting circuit which is connected with the amplifier and is used for compensating the amplified signal; an analog-digital converter which is connected with the amplifier and the zero-setting circuit, and converts the compensated circuit into a digital signal; and a digital signal processor which is connected with the analog-digital converter and is used for carrying out the operation processing of the digital signal. The zero-setting circuit is connected to the output end of the amplifier, and the output end of the amplifier provides a compensation current, thereby inhibiting the zero drift of the signal source and the zero drift of the amplifier. The signal processing circuit inhibits the zero drift of a plurality of circuit modules through the zero-setting circuit which is connected with the output end of the amplifier.

The invention provides a nano immunosensor for detecting penicillin G residues in a dairy product based on a double-layer lipoid membrane and a preparation method of the nano immunosensor. The nano immunosensor is composed of a working electrode, the double-layer lipoid membrane, Ag@Au core-shell nanoparticles and a penicillin G antibody. The nano immunosensor has the advantages of being simple toprepare, high in sensitivity, rapid in detection, strong in specificity, simple and convenient to operate, capable of directly detecting signals, good in detection limit and the like; the defects that an existing biosensor for penicillin G detection is tedious in preparation process, complex in equipment and free of sufficiently low detection limit are overcome; and construction of an immunosensor for detecting penicillin G by adopting an unlabeled immunoelectrochemistry method is realized.

An inductance device with a common mode differential mode inductance function, comprising: an inductance frame body with a first winding portion, a second winding portion, and an accommodating area surrounded by the first winding portion and the second winding portion The first coil is wound on the first winding portion; the second coil is reversely wound on the second winding portion, and has a common mode inductance function; The part is joined to the inner edge of the inductor frame to be arranged in the accommodating area, and the magnetic conductive member is spaced between the first coil and the second coil so as to have magnetic induction with the first coil and the second coil respectively, and has a differential mode Inductance function, through the above structure, the inductance device of the present invention has the functions of common mode and differential mode inductors at the same time.

The invention provides a Mn-Zn ferrite magnetic material, and relates to the field of soft magnetic ferrite materials. The Mn-Zn ferrite magnetic material is prepared from main ingredients and auxiliary ingredients, wherein the main ingredients mainly comprise, by weight, 45.6-63 parts of ferric oxide, 16-25 parts of zinc oxide and 22-29 parts of manganese oxide, and the auxiliary ingredients comprise, by weight, 3-10 parts of calcium carbonate, 2-4 parts of iron boron, 0.5-1.5 parts of titanium dioxide, 0.5-1.5 parts of tin antimony oxide, 0.2-0.7 part of gadolinium nitride, 2-7 parts of citric acid, 3-7 parts of carboxymethylcellulose, 2-4 parts of a 5% polyvinyl alcohol solution, 6-8 parts of urethane acrylate and 0.01-0.05 part of niobium pentoxide. The invention further provides a preparation method of the Mn-Zn ferrite magnetic material. The Mn-Zn ferrite magnetic material has both high permeability and high magnetic interference resistance.

The invention discloses a method for manufacturing a thin film for a sheet-type film attenuator. The method comprises the steps of manufacturing a silk screen, printing a surface electrode, printing a back electrode, printing a resistor, printing a barrier layer, conducting laser resistor trimming, splitting, conducting end coating, electroplating and the like. The manufacturing method can greatly reduce the installation area, the weight, the number of components and the like and can reduce the volume, and particularly, the produced attenuator has the advantages of being flexible in design, stable in performance, good in high-frequency performance, convenient to assemble, high in reliability, high in characteristic impedance and decrement precision and the like.

The invention provides an enhanced material for magnetic beads. The enhanced material is composed of a base material and an additive. The base material is FeCoNiCrAl-coated SiO2 high-entropy alloy with a core-shell structure; the additive is composed of ZrO2, SiO2, Al2O3, TiO2, B2O3, and mica KAl2 (AlSi3O10) (OH) 2. The invention further provides a preparation method of the enhanced material for the magnetic beads. Furthermore, the invention further provides a preparation method of the laminated magnetic beads. According to the invention, the high-entropy alloy with the FeCoNiCrAl-coated SiO2shell-core structure is used as the base material; the additive contains ZrO2 powder in a certain proportion, and zirconite ZrSiO4 is formed in situ by SiO2 and ZrO2 in the calcining process, so thatthe bonding strength between the base materials and between the base materials and the additive is improved, and finally, the performance of the laminated magnetic beads is improved.