| 摘要 |
<P>PROBLEM TO BE SOLVED: To eliminate precisely a wrap-around signal which goes around from a transmission antenna to a reception antenna. <P>SOLUTION: A gain control 21 adjusts an amplitude of a transmission signal S1 so that an amplitude error detection signal S10 becomes 0. A variable phase shifter 22 changes a phase angle of a signal output from the gain control 21 by ϕ degrees so that a phase error detection signal S8 becomes 0. A first retarder 23 outputs a cancel signal S2 with a phase delay of π/2 towards a phase error detection part 3. A second retarder 24 generates a second delay signal S6 by delaying a first delay signal S5 with the additional phase delay of π/2. The phase error detection part 3 generates the phase error detection signal S8 indicating an amplitude error component of the wrap-around signal which remains in a canceled reception signal S4 on the basis of the canceled reception signal S4 and the first delay signal S5. The amplitude error detection part 4 generates the amplitude error detection signal S10 indicating the amplitude error component of the wrap-around signal which remains in the canceled reception signal S4 on the basis of the canceled reception signal S4 and the second delay signal S6. <P>COPYRIGHT: (C)2012,JPO&INPIT |
