| 摘要 |
PROBLEM TO BE SOLVED: To provide a small-sized and inexpensive radio unit with efficient connectivity. SOLUTION: Since a separation means, a four-terminal circulator 11 has directivity to transport a transmission signal from a transmission means 21 to a transmission/reception duplex antenna 13 and to transport a reception signal from the transmission/reception duplex antenna 13 to a reception means 22, so that transmission and reception signal at nearby frequencies can be separated without using an expensive duplexer, thereby achieving provision of the small-sized and inexpensive radio unit with efficient connectivity. COPYRIGHT: (C)2008,JPO&INPIT
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