High performance TD-SCDMA band-pass filter based on film bulk acoustic resonator technology

This paper presents a high performance TD-SCDMA band-pass filter based on film bulk acoustic resonator (FBAR) technology. The filter is composed of a group of FBARs connected in ladder configuration. Excellent quality factor greater than 1,000 has been achieved at resonant frequency near 2 GHz for the FBAR. The TD-SCDMA FBAR filter has been fabricated and tested. The filter demonstrates low passband insertion loss of 1.7 dB and high stopband rejection greater than 35 dB.