Patent ID: 7356349

Claim:
A high-frequency module comprising: a separating unit for separating at least three communication signals having different transmission/reception frequency bands into a transmission/reception signal of each of the at least three communication signals; a frequency selecting unit for selecting a frequency band of the transmission/reception signal so as to be passed therethrough; and a transmission port and a reception port for each of the at least three communication signals; wherein a reception signal side of each of the at least three communication signals in the frequency selecting unit includes a SAW filter having a transmission characteristic according to each usable frequency band; the separating unit includes a diplexer for separating the at least three communication signals into a first communication signal and second and third communication signals, a first switch for separating the first communication signal into transmission and reception signals, a second switch for separating the second and third communication signals into transmission signals and reception signals, and a duplexer for separating the reception signals into a reception signal of the second communication signal and a reception signal of the third communication signal; and the duplexer includes a first phase-shift circuit which includes at least a diode and which attenuates the transmission signal of the second communication signal when the diode is ON and allows only the reception signal of the third communication signal to pass therethrough when the diode is OFF.