Phase discriminator for reflected waves and operating method thereof

Abstract

The present disclosure provides an apparatus and method of discriminating a phase of reflected waves. The apparatus includes a sensing impedance circuit disposed between a signal source and a load and having a variable sensing impedance, a directional coupler disposed between the signal source and the sensing impedance network, and a controller configured to detect intensities of an input signal transmitted from the signal source to the load and a reflected signal reflected from the load, determine a magnitude of the reflection coefficient based on the intensities of the signals, determine a difference in the magnitude of the reflection coefficient based on a plurality of magnitudes of the reflection coefficients obtained with respect to different sensing impedances, discriminate a range of the phase of the reflected waves based on the difference in the magnitude of the reflection coefficient, and control the sensing impedance network to change the sensing impedance.