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New Design Method of Two-Layered Open-Loop Microstrip Bandpass Filters Based on the Cul-de-Sac Coupling Matrix

A planar-circuit filter based on the Cul-de-Sac coupling matrix is constructed by a new design method. This method improves the filter characteristics at the design stage. Therefore, the final optimization process is unnecessary, or the time required for optimization can be shortened. We numerically and experimentally verify effectiveness of the proposed design method.