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 matching. 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.