Re: Gain measurement using the Precision beamwidth method

It is correct that directivity is obtained from the pattern and does not
include any ohmic losses on the antenna structure, as does gain.
Polarization and impedance mismatch are not antenna characteristics (they
are system items) and are not included in directivity or gain. I never
heard of the "precision beamwidth method".
> I expect the method is that of "pattern integration" which
> gives *directivity* not pure *gain*. I believe Arthur C. Ludwig
> in the United States may have published on this. For low I^2R
> dissipation antennas (some microwave horns as an example) you
> can estimate the small I^2R loss with good accuracy and get the
> absolute gain quite closely that way. NBS (now NIST) in the U.S.
> may be knowledgeable; another source might be A. C. Newell in
> Boulder Colorado.
>
> Regards
>
> Dan Bathker
>
>

Warren Stutzman
Virginia Tech Electrical Eng. Dept.
Center for Wireless Telecommunications
Satcom and Antenna Groups
Blacksburg, VA 24061-0111
540-231-6834 (direct line: 231-8401)
FAX 540-231-3355
Email: stutzman_at_vt.edu
Received on Fri Oct 04 1996 - 13:53:00 EDT