| 摘要 |
PROBLEM TO BE SOLVED: To eliminate the interference with a reception signal due to leakage of a transmission signal or the like. SOLUTION: This radio equipment applies the transmission signal from a transmitter from a first line 11 to an antenna through a circulator 3 for transmission and reception and applies the reception signal from this antenna to a receiver from a second line through the circulator 3 for transmission and reception. A circulator 15 for transmitter connection is connected between the transmitter and the circulator 3 for transmission and reception, and a receiver side directional coupler 14 is connected between the receiver and the circulator 3 for transmission and reception, and the circulator 15 for transmitter connection and the receiver side directional coupler 14 are connected by a third line 12 including an amplifier 21 and a phase shifter 22. The difference between the path length of the path passing first and second lines 11 and 13 from the circulator for transmitter connection and the path length of the third line 12 is set toλ/2 (λis the wavelength) or odd-foldλ/2 to cancel the leakage transmission signal component.
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