I am curious why you try to find the output impedance
looking from emitter since you use it as common
emitter. For me, I would care how to match the base
and collector port. Why VSWR is a complex number?
It should be the Amplitude of maximun voltage value
over minimun voltage value. I don't know where is
the complex part come from. And the reason why S-parameter
is complex value is that amplifier has equivalent
capacitance in side. S-parameter is define to descript
the intrinsic properties of a box. Now the box is
instead of an amplifer.
I have a general question how to match an antenna
to a self designed transistor amplifier. I want
to use a 2N4427 for 100MHz in common emitter
configuration (emitter directly on ground).
The collector is connected to 12V with via an
inductor with a high inductance. If I take the
signal at the emitter, what output impedance
do I see? Is there a rule of thumb how
to deal with the transistors regarding to power
. If I look at the VSWR or S-Parameter
of my antenna, there is also a complex part.
When everyone talks about output impedance of
the transistor, there is always only a real
number of Z mentioned. Is there no complex part?
I guess this is a very simple question and
I am just confused. However, an answer would
very much help me to understand the whole antenna
matching to an amplifier topic better.