| 摘要 |
An antenna duplexer of the present invention includes a first transmission/reception circuit for transmitting/receiving a GSM signal, and a second transmission/reception circuit for transmitting/receiving DCS and W-CDMA signals, which are connected in parallel via a diplexer. A third trap circuit including an inductor and a capacitor for forming a series resonant circuit having a resonant frequency in the W-CDMA frequency band is connected to a transmission line of the first transmission/reception circuit between a second diode switch interposed in series therewith and a branch terminal. The inductor is interposed in series between the second diode switch and the branch terminal. The capacitor has one end connected to a connection line between the inductor and the second diode switch, with the other end grounded.
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