Computer aided analysis and design of nonlinear multiport microstrip networks in frequency and time domain

The authors describe the extension of the state space technique to analysis of nonlinear and time-variant lumped/distributed (L/D) networks. The topological formulation of state, output, and nonlinear equations for nonlinear and time-variant networks containing multiports and independent sources is used. These equations have been incorporated into a computer-aided procedure for the analysis of L/D networks. The procedure can be used for the simulation of any nonlinear microwave circuit and offers the facility of developing a multiport equivalent circuit for any linear or nonlinear device or subcircuit. Several examples are successfully analyzed using the developed general program. Practical microstrip circuits of the above-mentioned nonlinear circuit are given, and experimental and simulated results show very good agreement.<>