Mark Sims wrote:
Yes, I also assumed that having the lip of the pan facing up would
not be good. I mounted the antenna on the bottom of the pan. In the
center of the top of the pan (the side where the pizza would be) I
glued a 5/8-11 nut. This is the standard size used on most surveying
instruments, antennas, and tripods. I can't flip the thing over to
test the difference the lip would make (but the pan was only $3 at Target).
Hehe... cheap :)
For my next antenna test, I also bought a cake pan. I want to
see what happens when you mount the patch inside the pan. I want to
try it both bare metal, and with the inside of the pan laminated in
carbon fiber. The idea is the side of the pan will act as a poor
man's choke ring and block signals from lower elevations. The carbon
fiber lining should help absorb reflections from the insides of the pan.
Maybe...
A choke-ring breaks waves into two waves... one which follow the choke
ring down, propagate along and up the next ring such that the distance
just straight across and the down-across-up is about half-wave such that
L1 waves comming straight will experience a null. Usually at least three
rings is used since that makes a third-degree breakpoint and makes the
main lobe wider.... rather than being fairly narrow... however, the
wave-approach detunes the frequency being nulled, so that helps with the
angular roll-off.
At least that's how I have grasped it.
Should learn to use nut for simulation.
Cheers,
Magnus
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