[Amps] close to off topic - how to read antenna R + jX ??

[G3rzp@aol.com]

In a message dated 27/02/2005 22:27:11 GMT Standard Time,  
david.kirkby at onetel.net writes:


My guess  is that the software in 
modern VNAs can take this into account, but I  might well be wrong. I'm 
sure there will be an Agilent application note (I  mean sales literature) 
on this!!



It's interesting that even with one of their latest digitally corrected  
doo-dads just back from calibration, you can still get the trace going outside  
the periphery of the Smith chart even after calibrating with the short and the  
open. Admittedly, that was with a rather wicked load of 62pF in series with 
1nH  and 0.3 Ohms at 400 MHz - a small patch antenna - and even higher it got  
worse.
 
Hartshorn's 'Radio Frequency Measurements' of 1940 is still worth  
reading..........
 
73
 
Peter G3RZP