Akustisches Bandsperrenfilter

摘要

The band elimination filter has acoustic resonators (402,403), each having one end grounded. The other end of the acoustic resonators, is connected to a transmission line. The electrode pads (404-407) are provided on the transmission lines at predetermined intervals. Independent claims are also included for the following: (1) filter device; (2) antenna duplexer; and (3) communication apparatus.