The Prediction and Characterisation of Coupling Between Transmission Line Structures to Enhance CAD of MMIC GaAs Circuits

A major design requirement for many GaAs ICs is a knowledge of the coupling properties between various conductor and transmission line sub-circuits. Networks of different geometries have therefore been accurately assessed. Predictions and measurements are presented from over 20 circuits incorporating coupled line pairs, with and without intervening shielding lines and transmission crossover networks. Appropriate theories have been selected based on accurate comparisons with measurements. An application to switching amplifiers is illustrated.