| 摘要 |
PURPOSE:To suppress a residual interference wave component included in three snthesized outputs of three antennas arranged in equal intervals, by performing the phase shift or amplitude control for the result of addition of receiving signals of the 1st and the 3rd antennas, at a feedback system. CONSTITUTION:A part of power of an interference wave obtained from an adder 5 is led to a phase detector 21 through a variable phase shifter 16 and a 90 deg. phase shifter 7b, because an output of the adder 5 being (100-300) is orthogonal to that of (100+300), when vectors 100, 300 of the interference output of the antennas 1, 3 are equal in amplitude and different in phase, the phase difference of a residual vector 8a is detected by performing the phase detection by the output from an adder 14 and fed back to the variable phase shifter 16, allowing to align the part almost on a line with the residual component of the interference wave of an output terminal of an adder 5 and to suppress effectively an interference wave residual component 8a. |
