[amsat-bb] Re: CP antenna from 2 WiFi panels

[John Belstner]

Hi Domenico,

The HG2414P is a linearly polarized patch.
http://www.34t.com/PDF/hg2414p.pdf

The HG2409PC is a circular polarized patch (LH or RH available).
http://www.34t.com/PDF/hg2409pc.pdf

They are about the same price too.

73, John

On Jun 7, 2010, at 3:23 PM, i8cvs wrote:

> ----- Original Message -----
> From: "John Belstner" <jbelstner at yahoo.com>
> To: "Greg D." <ko6th_greg at hotmail.com>
> Cc: <amsat-bb at amsat.org>
> Sent: Monday, June 07, 2010 4:37 PM
> Subject: [amsat-bb] Re: CP antenna from 2 WiFi panels
> 
>> Hi Greg,
>> 
>> These panels are patch style antennas and as such you will not be able to
> place one behind the other to obtain circular polarization.  Placing one
> next to the other will at best produce an elliptically polarized pattern,
> and you should use a 50 ohm splitter to keep your impedance 50 ohms.  The
> shape of the patch and position of the feed point is typically how you
> obtain circular polarization with a patch antenna.
>> 
>> Or, you can obtain RHCP with the same or more gain and less trouble by
> making a Helix.  A sheet of aluminum, #8 copper wire and and a piece of PVC
> of the right diameter is all you need.
>> http://brneurosci.org/helix-antenna.html
>> 
>> Or, you can try just a single panel and see how it performs for a while.
>> 
>> Good luck!
>> 
>> 73, John W9EN
>> DM13le
>> W9EN at AMSAT.ORG
>> 
> 
> Hi John, W9EN
> 
> I would like to know if  these panels are patch style antennas linearly or
> circularly polarized.
> 
> Tanks
> 
> 73" de
> 
> i8CVS Domenico
> 
> 
> 
> 
>