On 4/21/13 5:18 AM, Attila Kinali wrote:
On Sat, 20 Apr 2013 12:52:03 -0700
"Tom Van Baak" <[email protected]> wrote:
For the rest of you:
http://www.leapsecond.com/images/gps-pinwheel-1.jpg
http://www.leapsecond.com/images/gps-pinwheel-2.jpg
Thanks a lot...
So the design changed slightly from what Kunysz reported in whis two
papers [1,2] back in 2000... I wonder what this small, detached stripe
at the end of the "spokes" does. It's not mentioned in the papers.
But [2] shows some bragg reflector or something similar at the outer
perimeter (i guess to have a similar effect as a choke ring), maybe those
stripes replaced those.
I would imagine that they loaded the antenna into HFSS or some other
simulation code, and manually iterated it to improve the performance.
Little protrusions or adjacent stripes are usually for tuning: trying to
get the match right, or to suppress some high order lump or bump in the
pattern or VSWR curve.
Just like "snowflakes" when tuning RF circuits in microstripline.
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