A passive load can be denoted by a point in the right half of the complex Z-plane as shown in Fig(a)
The complex Reflection Coefficient is
The complex
can be expressed in cartesian and polar form as
Since for passive loads
, the reflection coefficient can be denoted by a point with the unity
circle in the complex - plane, as shown in Fig (b). 'R' denotes the magnitude of the reflection coefficient
and
denotes the phase of the reflection coefficient.
Since there is one-to-one mapping between
to
, the entire right half Z-plane is mapped on to the region
within the unity circle in the -plane.
) planes 
and 
can be expressed in cartesian and polar form as 
, the reflection coefficient can be denoted by a point with the unity
circle in the complex 
denotes the phase of the reflection coefficient. 
to
, the entire right half Z-plane is mapped on to the region
within the unity circle in the 
