A miniatuirized FBAR duplexer with reduced acoustic loss for the W-CDMA applicaion


This paper describes the development of a miniaturized antenna duplexer for the W-CDMA application. As the required insertion loss in the W-CDMA system is severe even for the film bulk acoustic resonator (FBAR) technology, we propose a modified FBAR structure, which we called an AlN “just-etched” FBAR, to reduce acoustic losses. The characteristics of the… (More)