Walter Maxwell wrote:
I thought it was common knowledge that the reflected energy is totally
re-reflected in the forward direction when encountering the open or short
circuit at the matching point.

The voltages and currents are listed at the Z0-match point in the following
example:
rho=0.5
200W source---50 ohm feedline--+--1/2WL 150 ohm feedline---50 ohm load
Vfwd1=100V-- Vfwd2=200V--
Ifwd1=2A-- Ifwd2=1.333A--
--Vref1=0V --Vref2=100V
--Iref1=0A --Iref2=0.667A

Vref1 = Vfwd1(rho) + Vref2(tau) (this is the same as b1=s11*a1+s12*a2)
0V = 50V at zero deg + 50V at 180 deg i.e. the voltages cancel

Iref1 = Ifwd1(rho) + Iref2(tau)
0A = 1.0A at 180 deg + 1.0A at zero deg i.e. the currents cancel

Through wave cancellation, both the voltage and current go to zero in
the direction of the source. That's like a short for voltage and an
open for current.
--
73, Cecil http://www.qsl.net/w5dxp



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