EPCOS has begun volume production of B7633 series bulk acoustic wave (BAW) duplexers and is supplying them to a leading U.S. manufacturer of mobile phones.

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BAW technology allows the production of frequency-selective filters and duplexers for applications in which conventional surface acoustic wave (SAW) technology comes up against its limits and cannot meet the required electrical specifications. BAW technology combines the high power compatibility of microwave ceramic filters with the compact dimensions of SAW filters. The new BAW duplexer is suited for mobile communications applications operating in the U.S. PCS or WCDMA band II.

The footprint of the B7633 BAW duplexer is 5 mm x 5 mm with an insertion height of 1.35 mm. The duplexer offers a low insertion loss of 3.6 dB in the Rx band and 2.7 dB in the Tx band and offers Rx-Tx insulation of 57 dB in the Tx band with 44 dB in the Rx band.

According to EPCOS, a miniaturized generation of BAW duplexers with a footprint of only 3.8 mm x 3.8 mm is currently under development.