[amsat-bb] Re: Making a Circular Polarized antenna

[Alan VE4YZ]

http://www.enzim.hu/~szia/emanim/emanim.htm

Above link has a wonderful 3D graphic display of waves. Give it a try.

You can adjust V, H, phase, and then display sum of the 2 waves.

I use it mainly to show how circular polarization comes about.

The sum of 2 waves in the same plane ( 180 degrees rotated ), 180 degrees
out of phase ( 1/2 wavelength ) is a nul which probably would be out
performed by a rubber ducky. 




> -----Original Message-----
> From: amsat-bb-bounces at amsat.org 
> [mailto:amsat-bb-bounces at amsat.org] On Behalf Of Greg D.
> Sent: October 24, 2009 7:34 PM
> To: amsat-bb at amsat.org
> Subject: [amsat-bb] Making a Circular Polarized antenna
> 
> 
> Hi folks,
> 
> Just curious...
> 
> One of the ways to make a circularly polarized antenna is to 
> feed two linearly polarized antennas in-phase, but mount one 
> them 90 degrees rotated from the other, and 1/4 wavelength 
> ahead of it.
> 
> Couldn't one also mount the two antennas 180 degrees rotated 
> and 1/2 wavelength ahead?  
> 
> The reason I ask is that I have some flat panel 2.4 ghz 
> "Wi-Fi" antennas, and the mounting holes work out best that way.
> 
> The only effect I can think of is that the array will 
> probably pick up signals from both left and right 
> polarizations, which could actually be handy.
> 
> Greg  KO6TH
> 
>  		 	   		  
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