[Antennaware] dBi conversion to Antenna Factor

K9AY k9ay at k9ay.com
Wed Nov 21 10:47:49 EST 2007

> is this gain dependent on the matching transformer as this transformer is 
> not in the model? Or am I missing something?
> 73
> Andy


As others have noted, EZNEC assumes that you have a matched feedpoint, so 
any loss in the transformer or other matching network should be added to 
your calculations, although it's probably quite small. I've measured my 
transformers at ~0.2 dB loss in the 2 to 7 MHz range. The description is in 
the Tech Notes section of my Web site, www.aytechnologies.com

You might not see a reference for matching network loss with commercial 
antennas, since they are usually calibrated for Antenna Factor using range 
measurements. Signals are sampled after the matching network; it is 
considered part of the antenna.

73, Gary

More information about the Antennaware mailing list