42results about How to "Improve the impedance effect" patented technology

A hermetic implantable medical device (IMD) is provided with a single or multi-pin arrangement including selected glass to metal seals for a feedthrough including a ceramic disk member coupled to the sealing glass surface in potential contact with body fluids. By judicious selection of component materials (ferrule, seal insulator and pin) provides for either compression or match seals for electrical feedthroughs (having a single or multi-pin array) provide corrosion resistance and biocompatibility required in IMDs. The resultant feedthrough configuration accommodates one pin within a single ferrule or at least two pins in a single ferrule having a pin surrounded by insulator material (e.g., alumina ceramic, zirconia ceramic, zirconia silicate ceramic, mullite, each having higher melting points than the sealing glass distributed around the pin within the ferrule, or feldspar porcelain materials or alumino-silicate glasses having a lower melting point than the sealing glass) distributed around the pin within the ferrule.

Structures and configurations for planar ultrawideband modular antenna arrays. One example of a PUMA array includes an unbalanced RF interface, a lattice of horizontal dipole segments directly fed with the unbalanced RF interface, the lattice being arranged in either a dual-offset dual-polarized configuration or a single-polarization configuration, and a metallic plate capacitively-coupled to the lattice of horizontal dipole segments and pinned to a ground plane with a first plated via.

The invention discloses a power management system. A reference power end, a first voltage maintenance module, a first switching module, a charging control module, a forced pull-low module, a first voltage comparison module, a second voltage comparison module and a logic control module are additionally arranged on the basis of a common power management system including an input power terminal, a battery terminal, a system power terminal and a grounding terminal. The provided power management system can automatically reduce the charging current signal until no current signal exists under the condition that the system cannot normally work due to insufficient driving power of the input power supply; and if the input power supply cannot supply the sufficient power for the system, the battery is enabled at the same time, so that the battery and the input power supply simultaneously supply power for the system to ensure the normal work of the system.

Provided are a broadband base station antenna radiating element and an array antenna. The radiating element comprises symmetrical radiating arms, feed pieces, hollow Balun supporting columns, hollow feed supporting columns, feed openings, feed piece fixing parts and feed coaxial cables, wherein two symmetrical radiating arms are intersected and distributed in a cross-shaped mode and symmetrically rotate relative to the center of the radiating element, one arm of the symmetrical radiating arms is connected with the hollow feed supporting columns, and the other arm is connected with the hollow Balun supporting columns. The number of the feed pieces is two, an auxiliary upright metal sheet of each feed piece is fixed in one hollow Balun supporting column, a main upright metal sheet of each feed piece is fixed in one hollow feed supporting column, the feed openings are arranged at the bottoms of the hollow feed supporting columns, outer conductors of the feed coaxial cables are fixed on the feed openings, and inner conductors of the feed coaxial cables are connected with the auxiliary upright metal sheet of one feed piece.

The invention provides a method and a device for processing radio-frequency signals, comprising N channels. The method includes the following steps of: setting bandpass filtering modules correspondingto the N channels, wherein the bandpass filtering modules have low impedance to the radio-frequency signals within the frequency bands of the corresponding channels thereof, and high impedance to theradio-frequency signals beyond the frequency bands of the corresponding channels thereof; the bandpass filtering modules receive the radio-frequency signals; and the bandpass filtering modules blockthe high-impedance radio-frequency signals which do not belong to the corresponding channels thereof by the low-impedance radio-frequency signals of the corresponding channels thereof. When the N channels share one frequency resource or N radio-frequency channels are converged into one radio-frequency node, frequency-band signals can be normally separated without a single-pole n-throw radio-frequency switch, thus reducing the volume and the cost of products.

The invention discloses a modified carbon black particle, a color paste, a composition, a color film substrate and preparation methods thereof, as well as a liquid crystal display panel and a TFT-LCD display device. The preparation method of the modified carbon black particle disclosed by the invention comprises the following steps: providing the following raw materials in parts by weight: 5-20 parts of carbon black particles, 5-40 parts of resin, 0.1-5 parts of a catalyst and 30-85 parts of a solvent; a covering step, to be specific, adding the carbon black particles and the resin into the solvent, stirring and raising the temperature to be 60-110 DEG C, adding the catalyst, and reacting for 1-5 h to obtain a modified carbon black particle solution. The color paste comprises the modified carbon black particles, the composition comprises the color paste, the color film substrate comprises a black matrix prepared by being covered with the composition, the liquid crystal display panel comprises the color film substrate, and the TFT-LCD display device comprises the liquid crystal display panel. According to the TFT-LCD display device disclosed by the invention, the problem of white lines generated when starting is overcome.

The invention discloses an automobile suspension bearing plastic piece. The automobile suspension bearing plastic piece comprises first limiting holes, an outer ring, second limiting holes, an inner ring, anti-skid fixed patterns, a bearing through hole, a metal framework, steel bead rings, fixed connection bolts, plastic elastic bases, fixing bases, pressure change springs, an inner clamping ring, fixed connection plates, clamping blocks and an outer clamping ring. The automobile suspension bearing plastic piece has the beneficial effects that the metal framework inner connection design is adopted in the bearing plastic piece, the overall strength of the bearing plastic piece is improved, and the bearing plastic piece can rival to a pure-metal material. The manufacturing cost is saved, and the service life is prolonged; the multiple plastic elastic bases are arranged on the outer ring of the bearing plastic piece, after a damping bar is inserted and connected in the plastic piece, the damping bar extrudes the inner ring, the plastic elastic bases deform and extrude and fix the damping bar, and using firmness is guaranteed; the S-shaped zigzag design is adopted in the anti-skid fixed patterns of the bearing plastic piece, the resistance capability of the plastic piece is greatly improved, and the using anti-skid performance of the plastic piece is guaranteed; and the plastic piece is convenient to operate, and components are flexibly connected.

A semiconductor structure includes a first-type semiconductor layer, a second-type semiconductor layer, a light emitting layer and a hole supply layer. The light emitting layer is disposed between the first-type semiconductor layer and the second-type semiconductor layer. The hole supply layer is disposed between the light emitting layer and the second-type semiconductor layer, and the hole supply layer includes a first hole supply layer and a second hole supply layer. The first hole supply layer is disposed between the light emitting layer and the second hole supply layer, and a chemical formula of the first hole supply layer is Al_x1In_y1Ga_1-x1-y1N, wherein 0≦x1<0.4, and 0≦y1<0.4. The second hole supply layer is disposed between the first hole supply layer and the second-type semiconductor layer, a chemical formula of the second hole supply layer is Al_x2In_y2Ga_1-x2-y2N, wherein 0≦x2<0.4, 0≦y2<0.4, and x1>x2.

The invention provides a heat-conducting adhesive tape. The heat-conducting adhesive tape comprises a release film, an adhesive layer, a metal foil and foam which are sequentially adhered to one another, wherein the foam is adhered to the metal foil in a pouring manner; the foam layer is prepared by performing mixed foaming on the following materials in parts by weight: 100 parts of polyether polyol, 25-40 parts of diphenylmethane diisocyanate, 0.8-2 parts of water, 0.3-1 part of a catalyst and 1-2.5 parts of silicone oil, wherein the hydroxyl value of the polyether polyol is 80-140. Comparedwith the prior art, the heat-conducting adhesive tape has the characteristics as follows: 1, a pressure-sensitive adhesive is not required to be used for bonding the metal foil and the foam, and the metal foil and the foam are bonded into a whole in a pouring manner, so that the problem of reduction in overall heat dissipation, caused by introduction of the pressure-sensitive adhesive, is avoided;2, the impedance of the foam is improved.

The invention provides a multilayer-polymer surface functional modified electronic fiber cloth flexible high-frequency CCL (copper-clad laminate) and a preparation method thereof. The high-frequency CCL comprises a graphene oxide metallized reinforced nanofiber layer located in the middle layer and conductive high-molecular polymer-insulating high-molecular polymer copolymer coated electronic fiber cloth layers located on two sides. The multilayer-polymer surface functional modified electronic fiber cloth flexible high-frequency CCL has three layers of thin films including the graphene oxide metallized reinforced nanofiber layer which is located in the middle layer and switched between a crystalline metal oxide form and an amorphous metal microform and the polymer copolymer coated electronic fiber cloth layers which are located on the two sides of the graphene oxide metallized reinforced nanofiber layer and have amorphous-state and crystal-state microstructures, the three layers of thin films are subjected to press fit with first copper foil and second copper foil located on the outer layer finally, and the high-frequency CCL which has good tensile property, elasticity modulus andbending strength, is capable of effectively resisting ultraviolet light and increasing light transmittance and has good bonding strength with the copper foil and lower stripping strength is prepared.

The invention belongs to the technical field of magnetic materials and preparation thereof. The invention discloses a manganese-zinc ferrite with high BS, high ZN and excellent ultra-wide-band characteristic and a preparation method thereof. The manganese-zinc ferrite comprises a main material and an auxiliary material, wherein the main material is prepared from iron sesquioxide, zinc oxide and manganese monoxide; the auxiliary material is prepared from calcium oxide, bismuth oxide, molybdenum oxide, niobium pentoxide and cobalt sesquioxide; the preparation method comprises the steps of preparing materials, mixing the main material and the auxiliary material, pre-burning the main material, adding the auxiliary material, performing secondary ball milling, performing granulation molding and sintering. The prepared manganese-zinc ferrite has the characteristics of high Curie temperature, high saturation flux density, high impedance performance and excellent ultra-wide-band characteristic, the permeability at 300kHz is 9,000 or more, the permeability within 300kHz does not attenuate basically, an excellent wide-band characteristic is achieved, and the advantages of the material are further improved.

The invention discloses a microwave shielding door body assembly and a microwave cooking electric appliance. The microwave shielding door body assembly comprises: a door body provided with a door plate; a door tooth structure arranged on the periphery of the door plate; and a door frame arranged on a cavity of the cooking electric appliance, wherein the door tooth structure comprises at least three layers of door teeth arranged in the thickness direction of the door plate, and the door frame is matched with the outer edge structure of the door teeth. The microwave cooking electric appliance is provided with the microwave shielding door body assembly. According to the microwave shielding door body assembly, two or more layers of door teeth are arranged on the periphery of the door plate, the microwave impedance effect can be improved, reflected waves and standing waves can be weakened, the power capacity of microwave transmission can be improved, the focusing phenomenon can be reduced, and the microwave shielding efficiency can be improved; and the door frame of the cavity is matched with the outer edge structure of the door tooth, and microwave leakage can be effectively reduced.

The invention discloses a preparation method of an anti-overcharged lithium ion battery pole piece and belongs to the technical field of preparation of battery pole pieces. The preparation method disclosed by the invention has the benefits that firstly, sodium dodecyl sulfate is mixed with deionized water to obtain a self-made dispersing liquid, so that the internal resistance of a lithium ion battery is increased, and the side reaction between a negative electrode and an electrolyte is reduced; in addition, particles have high thermal stability; polyethylene, 2-bromoanisole and N-methyl pyrrolidone are subjected to mixed reaction continuously to obtain self-made thermal expansion latex, wherein the polyethylene is a thermal expansion polymer, and once the battery is overcharged or over-discharged, the thermal expansion polymer can quickly expand; in addition, the 2-bromoanisole contains an ortho-bromo group, and the ortho-bromo group increases the stability of a benzene ring Pi bond conjugate system to a certain extent; adsorption products can hinder ion migration, charge transfer and the like, so that the overall impedance property of the battery is increased, and the anti-overcharge and cycle performances of the lithium ion battery pole piece are further improved; therefore, the application prospect is wide.

The invention discloses a high precision low maintenance pH meter, which includes a shell, a wiring terminal structure and components as well as a signal acquisition and processing system. The wiring terminal structure includes a signal terminal board and a signal terminal, the signal terminal board and the components are located in the shell, the wiring end of the signal terminal is located outside the shell, the front of the shell is provided with a hanger, and the front side of the signal terminal board is equipped with a signal shielding aluminum cover. The high precision low maintenance pH meter provided by the invention not only can protect components and the circuit from external liquid and gas corrosion, but also has the characteristics of convenient production and processing, low making cost, convenient installation and wiring, good heat dissipation effect, good mechanical stability, and wide application range, can "see" the measurement balance point of a sensor very visually, can judge the sensor performance visually, reduce the requirement for the professional skills of users, and improve the correction accuracy and measurement accuracy, lower the probability of incorrect use of a correction solution during correction, and especially can achieve better effect under an outdoor measurement condition and in high precision requirement measurement fields.

The invention provides a magnetic bead powder preparation method, which comprises the following steps of A) mixing aluminum sulfate, potassium aluminate, sodium acetate and acetic acid in water to obtain a mixed solution, B) immersing the magnetic metal particles subjected to acid pickling into the mixed solution, adding sodium hydroxide, and reacting under a stirring condition, C) drying the solid product obtained in the step B), and calcining to obtain a base material with a core-shell structure, D) carrying out ball milling and mixing on AlN, Bi2O3, ZrO2, SiO2, MnO2 and Co3O4 to obtain an additive, and E) mixing the base material with the additive to obtain the magnetic bead powder. The metal magnetic material is made into an M@Al2O3 core/shell structure, and the shell/core structure material not only maintains the specific high permeability of the metal magnetic material, but also has higher impedance characteristic due to the existence of the insulating shell. The invention further provides magnetic bead powder, a laminated magnetic bead and a preparation method thereof.

The invention provides a liquid-gas buffer, comprising: a cylinder body; a first piston assembly: including a piston head and a force transmission rod, the piston head is arranged in the cylinder body, and the cylinder body is divided into a first liquid cavity and a second A liquid chamber, the force transmission rod extends out of the cylinder; the piston head is provided with a first fluid channel and a second fluid channel communicating with the first liquid chamber and the second liquid chamber; the first fluid channel is provided with The first switching element is configured to open when the pressure in the first liquid chamber is greater than the pressure in the second liquid chamber; the second fluid channel is provided with a second switching element configured to open when the pressure in the second liquid chamber is greater than the pressure in the first liquid chamber. When the liquid chamber is under pressure, it is opened; the second piston assembly is arranged around the force transmission rod, and the second liquid chamber is formed between the piston head and the cylinder port to form an air chamber. The piston assembly of the liquid-gas buffer adopts a partly built-in and partly externally designed structure, which is used as a liquid cavity separation component and a force transmission component to make the buffer structure more compact.

The invention relates to a magnesium alloy product surface modification treatment method. The method includes working procedures of degreasing, pickling activation, alkali washing, and chemical modification, wherein an adopted modification solution comprises phosphoric acid, calcium hydroxide, sodium fluoride, zinc phosphate and the like. The method not only can meet the requirements of environmental protection and improve corrosion resistance, adhesive power, low impedance and other properties of a magnesium alloy, but also saves costs.