Design of Vector Modulator Using Low Phase Deviation Attenuators with Large Amplitude Variations Range

Abstract

In this paper, a novel vector modulator (VM) that precisely controls the magnitude and phase of input signals simultaneously is proposed. The proposed VM consists of low phase deviation attenuators, a 90° hybrid splitter, and Wilkinson power combiner. In order to overcome the phase deviation characteristics found in the conventional attenuators, the novel phase compensation technique has been adopted and mathematically analyzed. Linear vector arrays along the center point with large signal magnitude variations in a full 360° phase control are achieved on a polar plane by the proposed VM.