1. The ratio of the amplitude of the reflected wave and the amplitude of the incident wave. ( 188 ) 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. ( 188 ) Note 1: The reflection coefficient may also be established using other field or circuit quantities. Note 2: The reflection coefficient is given by
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 .