----- Original Message ----- From: "John Belstner" jbelstner@yahoo.com To: "Greg D." ko6th_greg@hotmail.com Cc: amsat-bb@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@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