| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna sharing system capable of sharing many frequencies with a narrow sharing frequency interval, with low loss, relating to a radio system having many radio channels in a narrow band. SOLUTION: A multichannel duplexer, which shares an antenna by compositing many radio transmitter outputs, includes a first transmission system 30A in which, input terminals 31<SB POS="POST">1</SB>-31<SB POS="POST">10</SB>into which signals from radio transmitters are inputted are connected to isolators 32<SB POS="POST">1</SB>-32<SB POS="POST">5</SB>, chBPF 33<SB POS="POST">1</SB>-33<SB POS="POST">5</SB>. They are composited using connection cables 34<SB POS="POST">1</SB>-34<SB POS="POST">4</SB>constituted with electrical length of aroundλ/2, and then transmitted through a transmission band BPF 36a connected with a cable 35<SB POS="POST">1</SB>constituted with the electrical length of aroundλ/2, as well as a second transmission system 30B which is configured like the first transmission system 30A. These two transmission systems 30A and 30B are composited by 2-mixing 2-distributing device 38 comprising a hybrid circuit, and outputted to an antenna terminal 39. COPYRIGHT: (C)2013,JPO&INPIT |
