Patent ID: 8400229

Claim:
A vector modulator configured for generating a cancellation signal for a transmission leakage signal in a radio transceiver system, the vector modulator comprising: a time delay configured for varying a phase of an input signal by time-delaying the input signal; a first coupler configured for: converting the phase-varied input signal into an I-channel signal and a Q-channel signal, the I- and Q-channel signals each having a 90° phase difference relative to the input signal, and outputting the I-channel signal and the Q-channel signal; a first phase shifter configured for: varying a phase of the output I-channel signal within a first predetermined phase range, and outputting the phase-varied I-channel signal; a second phase shifter configured for: varying a phase of the output Q-channel signal within a second predetermined phase range, and outputting the phase-varied Q-channel signal; and a second coupler configured for: coupling the output phase-varied I-channel signal and Q-channel signal via vector summation, and outputting the coupled I-channel signal and Q-channel signal.