nuckollsr(at)cox.net
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 Posted: Thu Nov 02, 2006 7:21 am Post subject: Is this solder okay?Annular slot transponder antennae? |
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At 06:50 AM 11/2/2006 -0800, you wrote:
We used a number of antennas like this on our supersonic
targets (things that stick out in the breeze at Mach 4
tend to burn off). I can't speak to comparative performance
'cause I wasn't working those issues . . . and in any case,
we had no choice. At the same time, I didn't hear of any
antenna performance issues.
I believe they have a radiation pattern similar to this:
http://www.aeroelectric.com/Pictures/Misc/Circular_Aperture_Ant_Radiation_Pattern.pdf
. . . which makes them less than ideal for talking/listening
to stations on the horizon. We often had an array of 3 or 4 antennas
around the body of the aircraft fed by couplers so as to improve
on the "omni directional" radiation pattern.
I think I'd look long and hard for some lab test data on
suitability of this antenna to the task before crafting
one for the airplane. Know also that built-to-print often
does not yield the idealized antenna . . . the finished
device is best tested and optimized with the proper test
equipment. Then too . . . you can always try it and see
how it performs for your flight modes. Anecdotal data is
better than no data.
Bob . . .
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< What is so wonderful about scientific truth...is that >
< the authority which determines whether there can be >
< debate or not does not reside in some fraternity of >
< scientists; nor is it divine. The authority rests >
< with experiment. >
< --Lawrence M. Krauss >
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