COMPARISON BETWEEN THEORETICAL AND MEASURED MICROSTRIP GAP PARAMETERSINVOLVING ANISOTROPIC SUBSTRATES

In this paper, experimental results are presented for microstrip symme trical-gap discontinuities. The experimental technique is based on the measurement of the resonant frequencies of se, cra) gap-coupled recta ngular microstrip resonators, In particular, gap discontinuities on an isotropic dielectric and two-layer composite substrates have been inve stigated. Reasonably goad agreement has been found in most cases betwe en theoretical data [obtained by means of the excess charge technique in the spectral domain (EC-SDA)] and experimental data, el-en though t he theoretical results have been obtained by using a quasi-static appr oach.