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Speedy11(at)aol.com
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 Posted: Wed Jan 19, 2011 5:54 pm Post subject: AeroElectric-List Digest: 8 Msgs - 01/18/11 |
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Bob,
That could be a very interesting project. Were I not so ignorant about antenna physics, I might try it myself.
Stan Sutterfield
In a message dated 1/19/2011 3:02:38 A.M. Eastern Standard Time, aeroelectric-list(at)matronics.com writes:
| Quote: | Got home a few hours ago and posted a patent issued
in '61 for what is euphemistically called a "scimitar"
antenna.
http://www.aeroelectric.com/Reference_Docs/Antenna/Scimitar_Patent_3015101.pdf
I recalled seeing these all over the empannage belly
of the B-52. They looked like tie-down rings except that
there was about a half dozen of various sizes. They
were associated with the electronic counter-measures
system. I was a bomb-nav guy so I didn't get any schooling
on them.
Years later I was thinking about making a robust
transponder antenna using this design philosophy
but never got around to it. Others here on the List
might be interested in trying it out. Note that
where the SWR on the exemplar antenna in the patent
goes below 2:1 (4,000 Mhz) the horizontal radiation
pattern goes pretty circular.
An antenna could be crafted from aluminum or perhaps
brass and thick enough to offer the wished-for mechanical
robustness. The edges could also be sculptured as
necessary for aerodynamically appealing affect.
It was interesting to contemplate the development history
of this antenna. While based on development work by
the Turner guys pre 1958 the patent wasn't issued until
1961. The airplanes I was working on were built in the
1954-58 time frame and already had several sizes installed.
Similar antennas on the spacecraft programs were faired
with radomes. The antennas on the B-52 were bare and
hung right out in the breeze.
Anywho, for what it's worth, this might be the basis
for a nice DIY antenna project. It would lend itself
well to an article featuring fabricate-to-drawings
illustrations.
Bob . . |
[quote][b]
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