Richard Harrison wrote:
A high impedance means: accepts little current for a given voltage. The
open end of a good 1/4-wave short-circuited stub is defined as a high
impedance. So much so that it is also called a "metallic insulator".

If it was indeed a high physical impedance, like a 250K resistor, it could
be removed and no much would happen at its resonant frequency. Unfortunately,
it is not a physical impedance and is merely a V/I ratio, a virtual impedance.
There is nothing at the mouth of the stub capable of causing reflections.
All the reflections occur at the shorted end of the stub.

The forward and reflected voltages add in phase and the forward and
reflected currents add 180 degrees out of phase at the mouth of the stub.
The ratio of forward voltage to forward current is the Z0 of the stub as
is the ratio of reflected voltage to reflected current.
--
73, Cecil http://www.qsl.net/w5dxp



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