At 10:33 AM 5/16/2009, Greg D. wrote:
------------------snip--------- Pretty much every Wi-Fi antenna I've ever seen is linearly polarized. The "diversity" antennas are two separate antennas, usually one vertical and one horizontal, with separate cables going to two radios. Going circular would seem to be a no-brain improvement for the Wi-Fi crowd, but I think I've only seen one vendor do it.
Enjoy the new toy,
Greg KO6TH
I have toyed with using a comercial medium gain patch array for 2.4 GHz Leos. I would guess that there is no incentive to use circular pol for terrestrial data links. Even reflections and multi-path signals would remain linear. Space com is a totally different deal and circular makes sense if there is room for the CP antenna on the sat.
I still have my 85cm offset dish fed with short helix for AO-40 2.4 GHz, but I expect the narrow beamwidth would be lots of trouble for manual tracking 2.4 Leos. That is why I thought to use a 10-dB commercial antenna (also cheap and easy). Is CP a better idea? ...and would one need to reverse the sense on 2.4 GHz very often?
73, Ed - KL7UW