Re: polarization

[Brian Whatcott <betwys1@SBCGLOBAL.NET>]

At 08:40 PM 3/3/2004, you wrote:
> Brian Whatcott suggests:
>
> > If waveguides were too rarified, perhaps a twin line with dipole
> > termination would be more to the student taste... Its polarization
> > is less easily gainsaid, possibly?
>
> Yes, that would be good, though I don't know what you mean by "dipole
> termination". I wouldn't like to have to manipulate the "cake grids" of
> size sufficient to do the demonstration with the long waves I envision
> coming from a simple half-wave dipole. ///
>  I don't know why he used a folded dipole instead of the
> conceptually simpler simple dipole. I asked him and he doesn't
> remember, either. The voltage developed at the feed point should be
> twice as high with a folded dipole, I think.
>
> Leigh

Dipoles are to be found at x band.  Twin feeds are lossy at these
 frequencies, but a folded dipole matches such a line better.
One thinks of 50-80 ohms for a dipole, and 300 ohms for a folded
version. It is better to terminate a line in its characteristic
 impedance.



Brian Whatcott    Altus OK    Eureka!