| 摘要 |
PROBLEM TO BE SOLVED: To provide a simple circuit configuration which can be adapted even when a frequency band are close to each other, in a high frequency circuit compatible with at least three different communication systems. SOLUTION: The high frequency circuit comprises: an antenna terminal Ant1; transmission and reception terminals Tx1-1, Tx2-1, Rx1-1 and Rx1-2 for first and second communication systems; a reception terminal Rx3-1 for a third communication system; a switch circuit for switching the connection between a common terminal connected to the antenna terminal and a switching terminal connected to a transmission path or a switching terminal connected to a reception path; a branching circuit for branching the transmission path according to a frequency; a branching circuit for branching the reception path into a common path connected to the reception terminal for the first communication system and the reception terminal for the third communication system and a path connected to the reception terminal for the second communication system according to the frequency; and a branching circuit for branching the common path into a path connected to the reception terminal for the first communication system and a path connected to the reception terminal for the third communication system. COPYRIGHT: (C)2009,JPO&INPIT
|
