Reflection Coefficient between Complex Impedances

During the process of transmission line theory learning and RF circuit design, it is found that the reflection coefficient between passive complex impedances may be greater than 1 by using the typical reflection coefficient formula in the textbook. To solve this problem, the reflection coefficient formula between passive complex impedance is derived from the concepts of forward and reverse voltage and forward and reverse power, and verified by ADS simulation. The content of this paper is helpful for learners to understand and master the reflection coefficient.