Patent ID: 8582547

Claim:
A high frequency circuit used in a communication device that performs radio communication using at least a first frequency band, a second frequency band higher than the first frequency band, and a third frequency band higher than the second frequency band, the high frequency circuit comprising: an antenna terminal to be connected to an antenna, a first transmitting terminal for inputting a transmit signal of the first frequency band, a second transmitting terminal for inputting a transmit signal of the second frequency band, and a third transmitting terminal for inputting a transmit signal of the third frequency band; a first receiving terminal for outputting a received signal of the first frequency band, a second receiving terminal for outputting a received signal of the second frequency band, and a third receiving terminal for outputting a received signal of the third frequency band; a switch circuit, connected to the antenna terminal, using a field-effect transistor for switching between a connection with the first, second and third transmitting terminals and a connection with the first, second and third receiving terminals; a transmitting-side triplexer for branching a transmitting path connected to the switch circuit into transmitting paths of the first, second and third frequency bands; and a receiving-side triplexer for branching a receiving path connected to the switch circuit into receiving paths of the first, second and third frequency bands; wherein at least one of the transmitting side triplexer and the receiving-side triplexer includes: a first band-pass filter unit, disposed in a first path between a common terminal and a first branching terminal, and permitting passing of a signal of the first frequency band, a second band-pass filter unit, disposed in a second path between the common terminal and a second branching terminal, and permitting passing of a signal of the second frequency band and a third band-pass filter unit, disposed in a third path between the common terminal and a third branching terminal, and permitting passing of a signal of the third frequency band, wherein first, second and third parallel resonant circuits are arranged between the common terminal and the first, second and third band-pass filter units, respectively, and wherein a phase adjustment circuit is arranged between the band-pass filter unit and the corresponding parallel resonant circuit in at least two of the first, second and third paths.