An Iterative Design Procedure for the Synthesis of Generalized Dual-Bandpass Filters
This article presents an iterative design technique to calculate the optimal position of transmission zeros in dual-bandpass filters. In the proposed design technique, the characteristic function of the filter is linearized around the displacement of the transmission zeros. A linear system is then obtained and solved in combination with a damping technique used to guarantee the convergence. Design examples which demonstrate the efficiency of the proposed method are presented and an experimental verification at 4 GHz using open-loop resonators validates the methodology. (C) 2009 Wiley Periodicals, Inc. Int J RF and Microwave CAE 19: 607-614, 2009.
filters dual-band iterative methods polynomial approximation