A bandpass filter is capable of forming attenuation extremes on both sides of a passband. Multiple microstrip line resonators, one end of each being an open terminal and the other end connecting to a ground electrode, are provided in a row, and the inner microstrip line resonators are bent in a C-shape...http://www.google.fr/patents/US6326866?utm_source=gb-gplus-shareBrevet US6326866 - Bandpass filter, duplexer, high-frequency module and communications device
Bandpass filter, duplexer, high-frequency module and communications device
