34results about How to "Improving Impedance Performance" patented technology

An attenuation reduction grounding pattern structure for connection pads of a flexible circuit board includes a plurality of high frequency connection pads formed on a component surface of a substrate and a plurality of differential mode signal lines arranged on the substrate and connected to the high frequency connection pads. The substrate has a grounding surface forming a grounding layer. The grounding layer includes an attenuation reduction grounding pattern structure formed at a location corresponding to the transition zone and including a hollowed area and a protruded portion. The protruded portion extends a predetermined length in a direction from the grounding layer toward the high frequency connection pads and along the adjacent high frequency connection pads to reach the transition zone. The protruded portion and the high frequency connection pads form a polarization-direction-varying electric field in the transition zone.

The invention relates to the technical field of soft magnetic ferrites. The high-frequency high-impedance iron-poor manganese-zinc ferrite comprises main components and additives, the main componentscomprise the following raw materials in percentage by mole: 47.8%-49.8% of Fe2O3, 31%-36% of MnO, 15%-18.5% of ZnO and 0.7%-2% of Co2O3, the additives comprise 10 to 100 ppm of SiO2, 200 to 1000 ppm of CaCO3, 100 to 300 ppm of Bi2O3, 100 to 300 ppm of ZrO2 and 100 to 600 ppm of TiO2. According to the invention, the Co2O3 is added into the main components, the ratio of the main components is reasonably adjusted, and meanwhile, the additives are added for modification, so that the prepared iron-poor manganese-zinc ferrite also has high magnetic conductivity, high saturation flux density and highimpedance at high frequency.

The invention provides communication equipment, an electric connector assembly and an electric connector. The electric connector assembly comprises a first electric connector, a second electric connector and a dielectric layer, wherein the first electric connector assembly comprises a first insulating main body and a first conductive terminal arranged in the first insulating main body; the second electric connector comprises a second insulating main body and a second conductive terminal arranged on the second insulating main body; the dielectric layer comprises a capacitive dielectric layer or inductive dielectric layer; and the dielectric layer is positioned between the first conductive terminal and the second conductive terminal when the first electric connector is connected with the second electric connector, so that the first conductive terminal is capacitively connected with the second conductive terminal by the capacitive dielectric layer or is inductively connected with the second conductive terminal by the inductive dielectric layer. According to the communication equipment, the electric connector assembly and the electric connector disclosed by the invention, the technical problems of high production cost and poor effect caused by optimization impedance in the prior art are effectively solved, the production cost is reduced and better impedance performances are obtained.

The invention belongs to the technical field of fine chemical engineering, and particularly relates to a water-based polyurethane emulsion with high water resistance and ethanol resistance and a preparation method thereof. The invention provides the preparation method of the water-based polyurethane emulsion with high water resistance and ethanol resistance. The preparation method comprises the following steps: a) carrying out a first reaction on poly(propylene carbonate) polyol, diisocyanate, castor oil and a hydrophilic chain extender under the action of a catalyst to obtain a first product;b) adding a silane coupling agent into the first product to carry out a second reaction to obtain a second product; and c) adding a neutralizer into the second product to carry out a neutralization reaction, then adding deionized water for emulsifying, and then adding a non-hydrophilic chain extender to carry out a third reaction to obtain the water-based polyurethane emulsion. Experimental results show that a coating film formed by the water-based polyurethane emulsion disclosed by the invention has excellent boiling water resistance and ethanol resistance.

The invention provides a corrosion etching method for an ultra-small quartz wafer. The corrosion etching method comprises the following steps: 1) processing a large quartz wafer; 2) coating a Mesa region with a film; (3) etching the Mesa region; 4) carrying out size coating; 5) carrying out size corrosion etching; and 6) removing gold from the ultra-small quartz wafer. According to the invention,processing is carried out on a large quartz wafer to indirectly obtain a single quartz wafer; the marginal effect of the low and medium frequency quartz wafer is reduced by using a precision processing technology of Mesa coating and Mesa corrosion etching; the shape processing of an ultra-small-size quartz plate is indirectly completed through size coating and size corrosion etching, so that the problem of huge investment caused by introduction of a photoetching technology is avoided, a subsequent crystal processing coating material can be selected, and the cost pressure is reduced.

The invention discloses a Li3PS4 (lithium thiophosphate) solid electrolyte, a solid mixed electrolyte, an all-solid-state lithium-sulfur battery and a production method thereof. The Li3PS4 (lithium thiophosphate) is prepared by reacting Li2S (lithium sulfide) and P2S5 (phosphorus pentasulfide) in several organic solvents which are used as complex forming media containing carbonyl functional groupsthrough a liquid-phase oscillation method. According to the invention, core problems of lithium dendritic crystal growth, a low coulomb effect and an interface side reaction faced by the mass production of the three solid-state batteries are effectively solved, and the obtained all-solid-state lithium-sulfur battery based on the Li3PS4 (lithium thiophosphate) solid electrolyte has excellent performance; and high energy density of 900 Wh/L, 1000 times or more of charge-discharge cycles and 95% or more of coulombic efficiency can be achieved, and the safety performance is good. A traditional lithium ion battery can be replaced, and the battery is particularly suitable for electric transport vehicles, electric power storage and the like, and has a wide application prospect.

The invention provides a carbon composite composition and a carbon heater manufactured using the same. More concretely, the invention relates to the carbon composite composition used in the field of heating devices for electric ovens and the carbon heater manufactured using the same. The carbon composite composition may include a phenolic resin as a binder, a lubricant, and base material that determines a specific resistance of a resistance heating element at a high temperature. The carbon composite composition may prevent a dielectric breakdown, a spark and plasma from occurring in a carbon heater, and may improve radiation efficiency of the carbon heater.

In order to solve the problems of high impedance and short high-temperature cycle life of the existing high-nickel lithium ion battery, the invention provides a positive plate, which comprises a positive current collector and a positive material layer formed on the positive current collector, and is characterized in that the positive material layer comprises a high-nickel positive material as shown in a formula I and a compound as shown in a formula II: LiaNiqCoyMzO2, wherein a is greater than or equal to 0.9 and less than or equal to 1.2, q is greater than or equal to 0.7 and less than or equal to 1, y is greater than or equal to 0, z is greater than or equal to 0, q + y + z = 1, and M is selected from one or two of Mn and Al; the positive plate meets the following conditions: 0.05 < = (b/10) * (h/x) < = 15; 0.005 < = b < = 1, 0.7 < = x < = 1, and 80 < = h < = 140. Meanwhile, the invention also discloses a lithium ion battery comprising the positive plate. The positive plate provided by the invention can give full play to the synergistic effect between the compound as shown in the formula II and the high-nickel positive electrode material and the thickness of the positive electrode material layer, so that the high-nickel positive electrode material has relatively high structural stability and oxidation resistance, and the cycle and impedance performance of the battery is improved.

The invention discloses an all-solid-state battery and a preparation method thereof. The all-solid-state battery comprises a positive pole piece, a solid electrolyte layer and a negative pole piece. The positive pole piece comprises a positive pole material layer and a quantum carbon-based film/metal composite interface layer, an active material of the positive pole material layer is a silver-doped graphene material, the solid electrolyte layer comprises a solid electrolyte, and the solid electrolyte is a perovskite type (ABO3) oxide solid electrolyte. The negative pole piece comprises a negative pole material layer and a quantum carbon-based film/metal composite interface layer, and an active material of the negative pole material layer is a lithium manganate material. By introducing thequantum carbon-based film/metal composite interface layer, the core problems of lithium dendritic crystal growth, low coulombic effect and interface side reaction in mass production of the three solid-state batteries are effectively solved.