Influence of Jig Made of Microstrip Line for S-Parameter Method

Recently, the S-parameter method, which is the measurement method of the input impedance of the balanced antenna, has been proposed. However, when the measured frequency rises, measurement accuracy decreases because the influence of the jig cannot be disregarded. To eliminate an influence of the measurement jig, we have proposed the modified open correction using the ABCD-matrix. In this report, to improve the measurement accuracy of the S-parameter method using a jig fabricated by microstrip lines, influence on the measured values of a ground conductor and a strip conductor of the microstrip line is examined by calculation using the FDTD method and experiment. As a result, it is shown that the influence of a strip conductor on measured result is bigger than a ground conductor.