The characteristic impedance calculation method of microstrip line and application in embroidered microstrip line

Presently, it is difficult to measure the characteristic impedance of embroidered microstrip line for its conductive anisotropy directly. The published work had proposed use S-parameters estimate port a balanced dipole antenna, and cannot be used calculate lines with one arm. Thus, still problem on measuring obtaining 50 Ω line. Therefore, taking reflection coefficient as an intermediate variable, this proposes return loss [Formula: see text] derive expression Combined theoretical calculation experimental testing fabric-based line, was verified. Then, determine equivalent substrates. results show that fabric single-layer strip part substrate, double-layer not substrate.