[time-nuts] Choke Ring Antenna - Patch Placement?

[Bob Stewart]

I've seen the ring described as a ground plane, and as a series of 1/4 wave vertical filters.  The polarization is probably just the antenna element itself.  I don't think that a filter would care.  It looks like Don's comment about putting the patch just below the rim is pretty close.  I've been playing with it, and a CD about 3/16" below the rim plane with the patch sitting on top gives a pretty good pattern.  I need to find something else to use as spacers so I can get about 1/8" lower to see how it plays.

Bob





>________________________________
> From: Bob Camp <lists at rtty.us>
>To: Bob Stewart <bob at evoria.net>; Discussion of precise time and frequency measurement <time-nuts at febo.com> 
>Sent: Thursday, October 10, 2013 8:04 PM
>Subject: Re: [time-nuts] Choke Ring Antenna - Patch Placement?
> 
>
>Hi
>
>The first design principle they seem to use is to attenuate low angle signals. The assumption is that they are bouncing off ground level targets and then into the antenna. If there is a second principle (like polarization selection) it's not really clear how they are getting that job done. 
>
>Bob
>
>