Re: [amsat-bb] Reference/Source for patch antenna

[Anthony Monteiro <aa2tx@xxxxxxxxxxxx>]

Hi Howie,
You do not need two probes to get circular polarization
in a patch feed just like you do not need to feed the two
dipoles in a turnstile in quadrature to get it.

You can make antennas "self-phasing" by making the feed
impedances 50+j50 and 50-j50 in each dimension and using a
single feed point. This will give you a 50 ohm load but
each leg will be 45 degrees out of phase with the source.
This is the usual way to get circular polarization with a
patch.

73,
Tony AA2TX
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At 04:38 PM 8/21/01 -0400, Howie DeFelice wrote:
>The references in your post were very interesting, but they also raise a
>question. The article by WB2VVV indicates that in order to get circular
>polarizatioin, two probes fed in quadrature are required. All the
>plans/pictures I have seen for patch feeds so far only use one feed. Am I
>missing something ?
>
>Howie AB2S
>
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