Abstract:

With the metallic yarns as the conductive structure unit material, the new frequency selective fabrics based on U velvet were papered by velvet weaving method to explore the frequency response characteristics of flexible frequency selective surface. By testing and analyzing transmission coefficient of samples, influence factors of frequency response characteristics were studied. With the increase of unit structure size, line spacing, velvet height or inclination angle of testing, the resonant frequency shifts to low frequency, the density of the conductive yarns is increased, and the resonant frequency is moved to the high frequency, with the same unit bottom length, the resonant frequency of different U connectins has little change. The increasing of the number of the same U connecting leads to the lower frequency. When silver fiber is used as the unit conductive material, the resonance peak and bandwidth of the sample are larger. And the resonant peak of bare copper wire samples is sharper and steeper. U type velvet fabric has the stability performance of the angle of incidence, but has a great influence on the way of polarization.

Key words: U-type velvet fabric, frequency selective surface, influence factor, frequency response characteristic