Richard Harrison wrote:
An open-circuit 1/4-wave stub is an open circuit at both ends,
physically.

Let's look at a 1/4WL open stub.

source ----------------------------------+
|
| 1/4WL
|
|
open

The transmission line and stub are the same Z0 and
both are lossless.

The virtual impedance at point '+' is zero but there
is no physical impedance discontinuity at point '+'.
Are there any reflections originating at point '+'?

If we straighten out the line,

1/4WL
source-----------------------------------+------------open

Are there any reflections originating at point '+'?
--
73, Cecil http://www.w5dxp.com