Wideband measurement for input impedance of balanced antenna using the S-parameter method

Recently, a measurement technique called S-parameter method using a vector network analyzer has been proposed whereby the differential impedance can be found. In this paper, three compensating methods using ABCD-matrix are adopted to reduce the influence of a jig for the S-parameter method. The results of our proposed methods are presented and compared with a calculated result using the method of moments and the measured result of a monopole antenna on a ground plane.