W5DXP wrote in message ...

The transmission coefficient can certainly be greater than unity,
being (2*Z2)/(Z1+Z2).

From Pozar's Microwave Engineering (Pg. 606):

Reflection Coefficient looking into load = (Zl-Zo)/(Zl+Zo)

Where Zl is the load impedance, and Zo is the characteristic
impedance reference.

The reflection coefficient cannot be greater than unit.

How can you have an S21 that is greater than unity with a passive
network?


Slick