Miniature dual mode microstrip filters

A new generation of planar dual mode filters is introduced which offers significant size, weight, and cost advantages over previous designs. All currently used elliptic function, self-equalized, etc. filter designs can be implemented in microstrip using this new concept. The proposed filter structures are ideally suited for implementation using high-temperature superconductors. Basic dual mode resonator and filter structures are discussed, and experimental data for proof-of-concept filters implemented using both normal and superconducting microstrip are presented. Superconducting realizations of this class of filters may be used to replace bulkier, heavier filters currently used for satellite communications. >