| 摘要 |
PURPOSE: A high frequency switch for a dual band is provided to simplify the circuit structure of the high frequency switch. CONSTITUTION: In a high frequency switch for a dual band, a low pass filter(21) is connected to an antenna(ANT) and passes a usable frequency band. A duplexer filter(22) divides and passes the first band and the second band from the frequency bands through the low pass filter, and provides the transmission signals of the first and second bands to the low pass filter. The first switching circuit part(24) switches the selection of the received signal and the selection of the transmitted signal from the first band through the duplexer depending on the first and second switching voltages(V1,V2). The second switching circuit part(26) switches the selection of the received signal and the selection of the transmitted signal from the second band through the duplexer depending on the third and fourth switching voltages(V3,V4). |
