EM-based microwave circuit design using fuzzy logic techniques

The authors illustrate how EM simulators can be combined with fuzzy logic techniques to develop an efficient approach for designing microwave circuits. They demonstrate the approach by considering the design of a microstrip coupler, a microstrip 6-pole filter and an HTS microstrip 3-pole filter. The fuzzy logic system (FLS) is constructed using data pairs generated from an EM simulator. The FLS is employed as a design tool to directly synthesise the coupler and the filter physical dimensions for a required RF response. The results achieved demonstrate the validity of the proposed approach.