Phase discriminator for reflected waves and operating method thereof

A reflected wave phase discriminator, comprising:

• a sensing impedance network disposed immediately before a load and comprising a sensing impedance circuit of which sensing impedance is variable;
• a signal intensity detector configured to detect intensities of an input signal from a signal source to the load and a reflected signal reflected from the load;
• a reflection coefficient magnitude calculator configured to calculate a magnitude of a reflection coefficient based on the intensities of the input signal and the reflected signal;
• a sensing impedance selector configured to select the sensing impedance to a predetermined value according to the magnitude of the reflection coefficient to apply to the sensing impedance circuit;
• a reflected signal phase region discriminator configured to 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 and discriminate a range of a phase of the reflection coefficient based on the difference in the magnitude of the reflection coefficient;
• and
• an impedance controller configured to control the sensing impedance network to change the sensing impedance according to selection information from the sensing impedance selector.

A method of discriminating a range of a phase of reflected waves based on a magnitude of the reflection coefficient between a signal source and a load to compensate an impedance mismatch, the method comprising:

• detecting intensities of an input signal transmitted from the signal source to the load and a reflected signal reflected from the load;
• determining the magnitude of the reflection coefficient based on the intensities of the input signal and the reflected signal;
• determining 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;
• discriminating the range of the phase of the reflected waves based on the difference in the magnitude of the reflection coefficient;
• and
• controlling a sensing impedance network disposed between the signal source and the load to change a sensing impedance of the sensing impedance network.