Measurement of the Zoof Microstrip Lines

Expressions for the calculation of characteristic impedance and phase constant are derived from the scattering matrix coefficients for the coaxial line microstrip transmission. A simple technique is used for connecting the microstrip under test to the coaxial system on which measurements are made. A variable open circuit method is adopted for obtaining the scattering matrix co-efficients of the transmissions. Measurements on narrow ‘microstrip’ lines are presented with polystyrene as the dielectric substrate.