a novel thin film bulk acousti...

a novel thin film bulk acoustic resonator (fbar) duplexer for wireless applicationsTamkang Journal of Science and Engineering, Vol. 7, No. 2, pp. 6771 (2004)

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A Novel Thin Film Bulk Acoustic Resonator (FBAR) Duplexer for Wireless Applications
C. H. Tai 1 , T. K. Shing 1 *, Y. D. Lee 2 and C. C. Tien2
Material Research Laboratory Industrial Technology Research Institute Jhudong, Taiwan 310, R.O.C. 2 Department of Electrical Engineering Chung Hua University Hsinchu, Taiwan 300, R.O.C.
1

E-mail: shing@delta.com.tw

Abstract
A duplexer comprising transmitter (Tx) filter and receiver (Rx) filter using thin film bulk acoustic resonators (FBARs) for use in 1900 MHz PCS band is presented. The typical minimum rejection specifications for Rx filter are > 50 dB in the band of 18501910 MHz and for Tx filter are > 40 dB in the band of 19301990 MHz. The duplexer requires filters