Accurate Modeling of a Patterned Ground and its Application to Microwave Filters

摘要

A patterned ground and its exactly equivalent lumped circuit model are analyzed in depth in this paper. Characteristics of the introduced patterned ground include providing the finite attenuation pole and reflection pole near the cutoff frequency, thus effectively improving the frequency-response selectivity. The basic unit cell and its performance are first studied. A circuit theory-based lumped model is then introduced. To verify the developed equivalent model, a prototype low-pass filter using three cascaded cells is designed. Results of the prototype filter show a good consistency between the experiment and theory.