Investigation of effects of coax-to-microstrip transition on planar harmonic tag antennas

The paper investigates the effects of using coax-to-microstrip line transition with different mounting techniques and coaxial line terminals for measuring the characteristics of microstrip antenna. The investigations reveal that the antenna return losses and magnitude of characteristic impedance are least effected by vertically mounted tab terminal coaxial line. However, all the coaxial lines shift the phase of the characteristic impedance which requires phase correction.