RESISTANCE IN YOUR COAXIAL CABLE STUB
Your antenna has R = 0 ¦¸.
The R+jX (¦¸) chart allows for positive and negative R values.
1) What is the significance of R = 0 ¦¸ in your ¡°antenna¡±; Is there an ¡°RR-resonance¡± (one +R ¦¸
and one ¨CR ¦¸ meeting and cancelling at = 0 ¦¸) ¨C in the same way the LC meet in resonance at ¡ÀjX = 0 ¦¸?
This would be like the Negative Resistance Oscillator type amplifier in the old reflex Klystron microwave emitters, used for radar. And in the Gunn Diode.
Be careful Simen with the "saver" R+jX chart, there is never negative values for R. The R scale (red) is on the vertical left side of the chart, and for this example with a range from 0 to 2000 ohms. Negative to positive values apply only to X (reactance) and are shown on the right scale (cyan) of the chart.
I suggest you to have a look to stub circuits behavior. I have put below a capture of data provided by W4RNL at which is a good summary.
Red marker in "saver" capture is the short circuit situation equivalent to a RLC series circuit with R=0 and LCw = 1/Cw (cancellation of reactive part) at 27.075 MHz.
Green marker in "saver" capture is the highest impedance situation equivalent to a RLC parallel circuit with high R (theorical infinite value) and LCw = 1/Cw (cancellation of reactive part) at 54.050 MHz
You can also check that L and C have not the same values for these two situations. Green marker behavior is equivalent to add a lambda/4 stub to the first one. The first provides the short circuit situation (red marker) which is the load value for the second lambda/4 stub. Finally you get the high impedance situation at the end of this second stub (green marker).
I hope it is enough clear as english is not my native language ! Please note that I don't succeed in downloading your s1p files from this message (file format probably unknown from the website).
Jean-Roger
