| 摘要 |
PROBLEM TO BE SOLVED: To provide a high frequency front end circuit which can control double spurious radiation at the time of transmission, enables antenna diversity for both of transmission/reception, and can share circuit parts. SOLUTION: A high frequency front end circuit has a first switch portion 110 connecting both or one of a first terminal 110A and a second terminal 110B to both or one of a third terminal 110C and a fourth terminal 110D in a one-to-one relationship, and a second switch portion 120 connecting both or one of a first terminal 120A and a second terminal 120B to both or one of a third terminal 120C and a fourth terminal 120D in a one-to-one relationship. Thus, a single broadband transmission amplifier 103 and a single broadband reception amplifier 104 can control spurious radiation at the time of transmission, can transmit/receive signals of two frequencies of 2.5 GHz and 5 GHz, and can realize an antenna diversity by a first and a second antenna 105 and 106. COPYRIGHT: (C)2005,JPO&NCIPI
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