SMR–BAW duplexer for W-CDMA application

This paper presents the design of a novel antenna duplexer based on a mixed ladder lattice topology using advanced Solidly Mounted Resonator–Bulk Acoustic Wave (SMR–BAW) and Integrated Passive Device (IPD) technologies. The duplexer is designed for application on W-CDMA handsets (Tx: 1920–1980 MHz, Rx: 2110–2170 MHz). The design methodology and implementation issues are discussed. A combined electromagnetic acoustic analysis results in a maximum insertion loss of 1.75 and 2.3 dB for Tx and Rx paths. The Tx–Rx isolation is better than 47/57 dB. The assembly of both Rx and Tx filters on the IPD will be discussed, as well as the simulated and measurement results.

[1]  W. P. Mason.  Electromechanical transducers and wave filters , 1942 .

[2]  R. Aigner,et al.  Ultra small PCS duplexer in plastic package using bulk acoustic wave (BAW) filter technology , 2004, 34th European Microwave Conference, 2004..

[3]  Martin Handtmann,et al.  Behavior of BAW devices at high power levels , 2005, IEEE MTT-S International Microwave Symposium Digest, 2005..

[4]  Kenneth Meade Lakin,et al.  Solidly mounted resonators and filters , 1995, 1995 IEEE Ultrasonics Symposium. Proceedings. An International Symposium.

[5]  D. Feld,et al.  Low insertion loss, high rejection handset duplexer for UMTS-1 (WCDMA) band , 2005, IEEE Ultrasonics Symposium, 2005..

[6]  R. Aigner,et al.  Advancement of MEMS into RF-filter applications , 2002, Digest. International Electron Devices Meeting,.

[7]  Robert Aigner,et al.  Thin film bulk acoustic wave devices for applications at 5.2 GHz , 2003, IEEE Symposium on Ultrasonics, 2003.

[8]  P. Bradley,et al.  A film bulk acoustic resonator (FBAR) duplexer for USPCS handset applications , 2001, 2001 IEEE MTT-S International Microwave Sympsoium Digest (Cat. No.01CH37157).

[9]  R. Cameron.  General coupling matrix synthesis methods for Chebyshev filtering functions , 1999 .

[10]  R. Aigner,et al.  Bulk-acoustic-wave filters: performance optimization and volume manufacturing , 2003, IEEE MTT-S International Microwave Symposium Digest, 2003.

[11]  J. Tsutsumi,et al.  A miniatuirized FBAR duplexer with reduced acoustic loss for the W-CDMA applicaion , 2005, IEEE Ultrasonics Symposium, 2005..

[12]  Andreia Cathelin,et al.  A Mixed Ladder-Lattice Bulk Acoustic Wave Duplexer for W-CDMA Handsets , 2007, 2007 14th IEEE International Conference on Electronics, Circuits and Systems.