The straight skinny about the "beta" or "hairpin" match can be found in
a QST article, April 1962, by Gooch and Gardiner. It explains how this
matching scheme works. The driven element is shortened making it capacitive.
Then the inductive reactance of the hairpin or beta section re-resonates the
element by canceling the capacitive reactance of the shortened element while
raising the feedpoint impedance at the same time. Theory, formulae, and
practical examples are all in the article.
The inverse is also desribed in the article where the element is
lengthened to make it inductive and a series capacitor used to re-resonate
the antenna.
Both of these methods have been used for years to manipulate the
feedpoint impedence of an antenna. The beta does have the advantage of
presenting a DC ground.
Al, K9SI
< Re: Ground Plane and Dipole Diatribe
Posted by: "allan crites" [email protected] wa9zzu
Date: Mon Feb 22, 2010 1:53 pm ((PST))
<Skipp
<I sure would be interested in what your version of a beta matched gnd plane
antenna which results in a 50 Ohm match looks like.
<Could you, would you, provide us with a description or picture to satisfy
my curiosity?
<Thanks,
<a.
<snip>
