| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a filtering method using a duplexer with an operational receiver port packaged by using an acoustic resonator. <P>SOLUTION: The duplexer is provided with an input/output line, a receive segment and a transmit segment. The transmit segment is connected to the input/output line. The receive segment is equipped with a balun and a differential filter. The balun is equipped with a first output, a second output, a first transmission line, and a second transmission line. The first transmission line is connected between the input/output line and the first output. The second transmission line is connected between the input/output line and the second output. The differential filter is connected to the first output and the second output. The differential filter shorts the first output and the second output in the transmit band frequency of the duplexer. <P>COPYRIGHT: (C)2003,JPO</p> |
