| 摘要 |
PROBLEM TO BE SOLVED: To provide a booster device capable of easily realizing at need a transmitter-receiver for multi-mode mobile communication of high output adaptive to a power class I by using a conventional transmitter-receiver for multi-mode mobile communication of a power class III. SOLUTION: An electric power amplification circuit 20 amplifying a transmission signal of an AMPS system, which is outputted from an antenna terminal 8, and outputting it to a second terminal 12, transmission circuits 19 and 24 transmitting a transmission signal of the other communication system except for the AMPS system to the second terminal 12 and reception-transmission circuits 21 and 25 transmitting reception signals of a plurality of communication systems, which are inputted to the second terminal 12, to a first terminal 11 are arranged between the first terminal 11 and the second terminal 12. A level of the transmission signal in the AMPS system is larger than that in the second terminal 12. COPYRIGHT: (C)2004,JPO
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