On Fri, Oct 11, 2019 at 08:13 AM, alan victor wrote:
the use of the antenna Q equation is a special case and
restricted apparently for VSWR = 1 as you stated
No, this is not special case. If your antenna has VSWR > 1 at X=0 then it means that your VSWR measurement is wrong. You're needs to measure VSWR for proper impedance.
If you have S11, you can recalculate VSWR for proper impedance. But note, S11 is valid when antenna is measured directly (with no feeding line). If you will try to measure antenna through feeding line, the feeding line will transform antenna impedance. You're needs to calibrate your VNA through feeding line.
