Ok you antenna gurus,
I read, somewhere in ancient times, that the permitivity and
permeability of space resulted in an optimum radiation
impedance for travelling EM waves of 377 ohms: the
impedance of the "ether".
Now, if so, why are not antenna designs based upon the idea
that they are really transformers, perhaps azimuth directional
transformers, who have a job to do. That is, transform the
energy coming forth from our 50 ohm transmission line
systems, and efficiently couple said energy into the 377 ohm
impedance of "space".
I am almost, but not quite certain, that I read once, in something
called Ramo & Whinnery, that all antenna design dealt with just
that problem -- of course that was decades ago, just after some-
thing called the Radiation Laboratory series of volumes appeared
in the world.
73, Jim, KH7M
--
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|