Patent ID: 7499678

Claim:
An antenna sharing device which has a diplexer and which switches paths for signals in a plurality of frequency bands, wherein said diplexer comprising: at least a common signal terminal which is connected to an antenna and which transmits and receives signals in said plurality of frequency bands; a high-pass filter; and units for distributively outputting signals in each frequency band selected from said receive signals and for combining and outputting transmit signals to said signal terminal; wherein said antenna sharing device further comprising: a first high-frequency switch which is connected to said high-pass filter and which separates the transmit and receive signals in said plurality of frequency bands; and a second high-frequency switch which is connected to a first output terminal of said first high-frequency switch and which separates said transmit signal and the receive signal in a frequency band separated from said plurality of frequency bands; wherein said first high-frequency switch includes compound semiconductors and said second high-frequency switch connected to said first output terminal includes PIN diodes.