A sequentially coupled filter design approach using the reflected group delay method and the implicit space mapping technique

The implicit space mapping technique is implemented as the optimization algorithm for the reflected group delay method in designing a 6-pole microstrip hairpin filter. A technique is proposed to reduce simulation points by matching a few selected group delay points. A computer-aided EM based design approach is proposed for the integration of the implicit space mapping technique and the reflected group delay method. The design steps are summarized and the filter is designed in Sonnet. By using the proposed method, the computation time and space mapping iterations are significantly reduced.