**1.** The ratio of the amplitude of the reflected wave and the amplitude of the incident wave.

**2.** At a discontinuity in a transmission line, the complex ratio of the electric field strength of the reflected wave to that of the incident wave.

*Note 1:* The reflection coefficient may also be established using other field or circuit quantities.

*Note 2:* The reflection coefficient is given by the equations below, where *Z* _{1} is the impedance toward the source, *Z* _{2} is the impedance toward the load, the vertical bars designate absolute magnitude, and *SWR* is the standing wave ratio: