Vector modulator using time delay and phase shifter

Abstract

An vector modulator using a time delay and a phase shifter is disclosed, the vector modulator including a time delay () varying a phase of an input signal by time-delaying the input signal; a first coupler () converting the signal outputted in changed phase through the time delay to an I channel signal and a Q channel signal each having a 90° phase difference and outputting the I/Q channel signals; a first phase shifter () varying the phase of the I channel signal outputted from the first coupler within a predetermined phase range and outputting the phase-variable I channel signal; a second phase shifter () varying the Q channel signal outputted from the first coupler within a predetermined phase range and outputting the phase-variable Q channel signal; and a second coupler () coupling phase-variable I/Q channel signals and outputting the coupled signals.