9results about How to "Improving Impedance Matching Performance" patented technology

The present invention provides a FeNiHo / carbon nanofiber composite absorber and a preparation method thereof, an absorbent material and a preparation method thereof, and belongs to the technical field of electromagnetic wave absorbing materials. The present invention first mixes iron salt, nickel salt, holmium salt and polyvinyl pyrrolidone in a mixed solvent, and electrostatically spins the obtained spinning precursor solution to obtain a nanofiber membrane; the nanofiber membrane is sequentially subjected to pre-oxidation treatment and carbonization treatment to obtain a FeNiHo / carbon nanofiber composite absorber. The FeNiHo / carbon nanofiber composite absorber, paraffin and petroleum ether are mixed, and then pressed and irradiated with ultraviolet light to obtain an absorbing material. The FeNiHo alloy nanoparticles in the composite absorber improve the impedance matching performance and electromagnetic wave attenuation ability of the carbon nanofiber. The obtained absorbing material can achieve the purpose of real-time adjustment of the absorption frequency by irradiation with ultraviolet light.

The invention provides a FeCo alloy / graphene foam composite material and preparation and application thereof, the FeCo alloy / graphene foam composite material comprises FeCo alloy particles and graphene foam, and the FeCo alloy particles are loaded on the surface of the graphene foam and embedded between sheet layers and pores of the graphene foam. Different graphene foam contents have great influence on the morphology structure, saturation magnetization intensity, electromagnetic parameters and the like of the product. Along with the increase of the content of the graphene foam, the loading area of the FeCo alloy is continuously increased, and the large-particle FeCo alloy loaded on the graphene sheet is continuously reduced. The saturation magnetization and the magnetic loss capability of the composite material are continuously reduced along with the increase of the content of the graphene foam, and the electrical loss capability is continuously improved.

The radio frequency packaging structure comprises a ceramic substrate, a bottom metal layer, a coplanar waveguide transmission line, a left side metal layer and a right side metal layer, the bottom metal layer is tightly attached to the bottom of the ceramic substrate, and the coplanar waveguide transmission line is tightly attached to the top of the ceramic substrate; the left side metal layer is tightly attached to the left side part of the ceramic substrate, and the right side metal layer is tightly attached to the right side part of the ceramic substrate; the coplanar waveguide transmission line comprises a first ground electrode, a second ground electrode and a signal electrode which are arranged in parallel; the first end of the signal electrode is of an isosceles trapezoid transition structure, and the size of the transition structure is gradually reduced along with approaching the modulator chip. According to the radio frequency packaging structure of the lithium niobate electro-optical modulator disclosed by the invention, the bandwidth of the packaged lithium niobate modulator can be improved on the premise that the bandwidth of a chip is not improved, and the loss in device packaging is reduced.

The utility model discloses a Mini Fakra line end connector. The Mini Fakra line end connector comprises a plug assembly and a socket assembly which are connected in a pluggable mode. The plug assembly comprises a first shell and a first terminal assembly fixedly arranged in the first shell; the socket assembly comprises a second shell and a second terminal assembly fixedly arranged in the second shell, a buckling structure is arranged at the top of the plug assembly, and a supporting part of the buckling structure is integrally formed at the top of the first shell and is close to the wiring end of the plug assembly. Compared with the prior art, a larger movement gap does not need to be reserved between the barb and the non-return surface, the plugging distance between the plug assembly and the socket assembly can be smaller, and the size of the barb can be larger, so that the connection stability of the plug assembly and the socket assembly is effectively improved; moreover, the buckling gap is reduced, the relative movement of the male terminal and the female terminal is reduced, the wear is reduced, the service life of the connector is prolonged, and the impedance matching performance and the high-frequency and high-speed signal transmission performance are further improved.

The present invention discloses a digitally controlled dual-frequency low-noise amplifier circuit with differential output, which includes an input impedance matching network, an amplifier stage, a differential output stage and a load stage. Compared with the traditional dual-frequency low-noise amplifier with independent channels, the present invention shares a common-gate amplifier with source negative feedback, which improves the power gain of the circuit, and also significantly improves the chip area, cost and circuit utilization. Compared with the traditional dual-frequency low-noise amplifier with independent channels, the present invention uses a switch to control the shutdown of the bias voltage, which reduces the design difficulty and increases the design flexibility, so that the circuit can obtain good noise performance and impedance matching effects in various frequency bands. The present invention effectively reduces the power consumption of the system by controlling the selection of the frequency band path through the switch.

This invention belongs to the field of electromagnetic wave absorbing materials technology, specifically relating to a nickel-boron-doped cobalt-based layered carbon absorbing material and its preparation method. This invention utilizes a cobalt-based boron imidazole precursor framework as a template, and forms a two-dimensional layered layered double hydroxide (LDH) through a chemical oxidation etching process using nickel ions. This LDH is then subjected to high-temperature reduction to obtain the nickel-boron-doped cobalt-based layered carbon material. This material leverages the unique properties of two-dimensional materials to achieve high impedance matching, allowing electromagnetic waves to enter the absorber at a significant rate. Furthermore, the material's excellent dielectric polarization and magnetic coupling attenuate the electromagnetic waves entering the absorber. The material achieves a minimum reflection loss of -60.1 dB and a maximum effective absorption bandwidth of 6.24 GHz, giving it excellent electromagnetic wave absorption capabilities. The preparation method of this invention is simple and easy to mass-produce.

This invention discloses a graphene aerogel surface microwave absorbing material supported on Fe / N co-doped hollow carbon nanospheres and its preparation method. First, a reduced graphene oxide aerogel is prepared using graphene oxide as a raw material. Then, hollow Fe3O4 magnetic nanoparticles are prepared via a hydrothermal method using FeCl3·6H2O and ammonium acetate as raw materials. Finally, Fe3O4 / PPy / reduced graphene oxide aerogel is prepared by in-situ polymerization, and the graphene aerogel supported on Fe / N co-doped hollow carbon nanospheres is obtained through high-temperature heat treatment. The graphene aerogel surface microwave absorbing material supported on Fe / N co-doped hollow carbon nanospheres of this invention exhibits excellent dielectric and magnetic losses. Simultaneously, the magnetic Fe nanoparticles in the material can effectively convert electromagnetic wave energy, achieving excellent microwave absorption performance, and showing great potential in next-generation cutting-edge advanced nanocomposite materials.

The invention provides a design method of a multilayer HTCC ceramic RF SIP packaging tube shell and a packaging device, relates to the technical field of RF SIP packaging, and aims to comprehensively optimize packaging design from multiple targets of signal integrity, heat dissipation performance, mechanical reliability and the like by dynamically optimizing the number of layers and the thickness of a multilayer stacked structure so as to avoid conflicts caused by single performance optimization. Meanwhile, based on the design of the gradient microstrip line, the impedance matching performance of radio frequency signals is remarkably improved, signal reflection and transmission loss are reduced, and the antenna is suitable for high-frequency signal transmission requirements. Sensitivity analysis and correction factors are introduced through trial assembly feedback, the deviation between simulation modeling and actual performance is gradually reduced, and efficient and accurate multi-time updating optimization is achieved. The final packaging tube shell design ensures excellent signal integrity, heat dissipation capability and structural reliability, and provides a systematic solution for modern high-frequency and miniaturized packaging.

The invention discloses a low-profile-based magnetoelectric dipole antenna and an optimization method, and the antenna is characterized in that a connector inner core is fixedly arranged on a reflection plate, and the connector inner core is connected with a feed structure; the feed structure comprises a first feed strip and a second feed strip, and the second feed strip comprises a first strip, a second strip, a third strip and a fourth strip; a first magnetic dipole, a second magnetic dipole, a third magnetic dipole and a fourth magnetic dipole are fixedly arranged on the reflecting plate, the first magnetic dipole is connected with the first electric dipole, the second magnetic dipole is connected with the second electric dipole, the third magnetic dipole is connected with the third electric dipole, and the fourth magnetic dipole is connected with the fourth electric dipole. The low-profile design enables the antenna to be more compact and light, the application range of the antenna is widened, the overall size and weight of equipment are reduced, the stability of the antenna is enhanced, the influence of wind resistance and mechanical vibration on the antenna is reduced, and therefore the reliability of the antenna is improved, and the service life of the antenna is prolonged.