| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a high frequency device with which a circuit connected at the back of an antenna terminal can be surely protected even when a high voltage noise invades. SOLUTION: A diplexer 11 is connected to an antenna terminal 10, the frequency components of a GSM band and a DCS band are multiplexed/ demultiplexed, and a circuit for handling the frequency component of the GSM band and a circuit for handling the frequency component of the DCS band are connected to the diplexer 11. In the circuit for the GSM band, a switch 13 for separating transmission and reception signals to the diplexer 11 is formed by using a diode 40, the diplexer 11 serially connects inductance 30 between the antenna terminal 10 and the switch 13 on the GSM side and parallelly connects a capacitor 31 and a varistor 32 and further, one terminal of the varistor 32 is connected to a ground terminal 33.</p> |
