3results about How to "Improving Impedance Performance" patented technology

The utility model relates to a high-impedance membrane switch. The high-impedance membrane switch comprises an acrylic panel, a first ink layer, a second ink layer, a first double-faced adhesive tape, a circuit layer, a second double-faced adhesive tape and release paper from top to bottom in sequence, wherein a touch key is arranged on the circuit layer; the first ink layer, the second ink layer, the first double-faced adhesive tape, the circuit layer, the second double-faced adhesive tape and the release paper are all provided with nixie tube display windows, all the nixie tube display windows are located at the same vertical position, and the impedance performance of the double-faced adhesive tape is better due to the fact that the double-ink and acrylic panel combination mode is adopted. The acrylic panel is moderate in thickness, small in size and high in brightness, and the electrostatic net is adopted, so that the anti-static effect of the anti-static LED lamp is good.

The invention belongs to the technical field of organic synthesis and high polymer materials, and particularly relates to a dicarboxylic anhydride photosensitive monomer as well as a preparation method and application thereof. The structural formula of the dicarboxylic anhydride photosensitive monomer is shown as a formula I: # imgabs0 #, n is an integer ranging from 1 to 5, and R1 and R2 are respectively and independently selected from hydrogen, fluorine, nitryl, monofluoromethyl, difluoromethyl, trifluoromethyl or trifluoromethoxy. According to the invention, the variety of binary anhydride is expanded, the polyimide polymer can be obtained through polymerization, and the light transmittance, the refractive index, the haze, the impedance performance and other functions of the polyimide polymer are improved; the obtained polyimide polymer shows excellent performances in the aspects of light transmittance, refractive index, haze, impedance and the like, and can improve the photoelectric conversion efficiency and reduce the transmission loss.

The invention discloses a rectangular coaxial waveguide-based unidirectional broadband spiral slot antenna and a manufacturing method thereof, and relates to the technical field of broadband unidirectional circularly polarized antenna design. The antenna structure is based on a rectangular coaxial waveguide, the broadband performance of the antenna is realized by using the broadband-pass characteristic of the rectangular coaxial waveguide, and meanwhile, the sizes of inner and outer conductors of the coaxial waveguide are reasonably adjusted, so that the characteristic impedance of the waveguide approaches 50 omega. According to the invention, the use of a balun and a matching network is effectively avoided, and the antenna structure is greatly simplified.