| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a compact duplexer employing a thin film bulk acoustic wave resonator (FBAR) which reduced the thickness and mounting area of a package. <P>SOLUTION: A duplexer includes a reception filter having first and second terminals, a transmission filter having third and fourth terminals, and an antenna terminal connected with the first and third terminals, wherein the reception filter and the transmission filter are ladder filters equipped with a thin film bulk acoustic wave resonator, a phase matching inductor having one grounded end is connected with a transmission line which connects the first and third terminals with the antenna terminal, and the transmission filter and the reception filter have specific characteristics. <P>COPYRIGHT: (C)2009,JPO&INPIT |
