Re: [amsat-bb] Circular Polarized Patch antennas

[Dave Guimont <dguimon1@xxxxxxxxxx>]

>
>Some good information on the 435MHz Circular Polarized Patch antennas on 
>AO40 from http://www.amsat.org/amsat/sats/phase3d/antennas.html
>
>
>Patch antennas can be described as a thin square of conductor material, 
>approximately 1/2 wavelength on a side, closely spaced above a larger 
>reflector plane. The center point of this active element may be grounded 
>using a vertical conductor. While not exact, this patch radiator can be 
>thought of as a pair of stacked dipoles, spaced by 1/2 wavelength and 
>backed by a reflector. The more correct description of the antenna is that 
>it is a pair of 1/2 wavelength


Tnx fer all the good info, Don.

I've been experimenting with the patches since AO40 was launched, and have
cut up a lot of copper!!

The patch testers patch2.zip and PTMK1.zip

at:

http://home.san.rr.com/doguimont/uploads

makes is very easy to test a lot of configurations in short order.



            73, Dave wb6llo@amsat.org
                    Disagree: I learn....
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