On Sat, 25 Mar 2006 01:09:06 GMT, Owen Duffy wrote:

On Fri, 24 Mar 2006 06:57:21 -0800, "Caveat Lector"
wrote:

Here is a site for examples of capture areas of antennas

http://www.sommerantennas.com/gain.html


Are you recommending it?

Unanswered...


Is the following statement from the page correct?

"Note: Antenna B has only half the capture area of antenna A and is
therefore able to "catch" only 50 percent of the electromagnetic
field; e.g., 50mV, compared to 100 mV/50 Ohms. This means 6dB less
gain for antenna B in comparison to antenna A."

Of course it is not.

The article seems based on some typical misconceptions about Capture
Area and the suggestion that you can run a ruler over a dipole (loaded
or otherwise) to measure up and calculate the capture area is
nonsense.

I wonder if that is how Somner derive the gain figures that they
publish for their antennas. (Gain is related to Capture Area, and if
they don't understand Capture Area, do they understand Gain?)

Owen
--