Dispersion characteristics of open microstrip using a direct VSW measurement approach

An alternative experimental method for dispersion measurements in open microstrip is presented. The methods utilizes a scanning near field probe to directly measure the standing wave on the line under test. The guided wavelength is obtained by measuring the distance between successive voltage minimums . A variety of closed form dispersion expressions are included for comparison with experimental results. Previously investigated methods such as the sliding load and ring resonator technique s are also tested.