Radio frequency transceiver circuits have a very broad range of applications. With the development of wireless communications, more and more minitype and integrational components are required. The convential microwave ceramic filters are too large and can not integrate with RFIC. The surface acoustic wave filters (SAW) can not assume high power for they are limited by the photoetch technology. As the only integrable solution for RF bandpass filters, the film bulk acoustic resonator (FBAR) filters become one...