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Let's design a short antenna just for fun

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November 5th 14, 08:38 PM posted to rec.radio.amateur.antenna

[email protected] jimp@specsol.spam.sux.com is offline

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Let's design a short antenna just for fun

wrote:
On Wednesday, November 5, 2014 1:01:02 PM UTC-6,
I would think a dipole would be a bad candidate for a "short" antenna
as you need to get the matching stuff close to the antenna to avoid
I^2R losses.

I'd probably use small matching coils at the feed point, about the
same as a mobile antenna.

There is a lot of stuff out there that says the best place to put
a loading coil is somewhere between 1/2 and 3/4 of the way up.

It should be fairly easy to model to see where it would be for
various total lengths.

In the real world, I try to avoid short antennas..
It's only a last resort due to lack of room. I rarely actually use one.

Me too for the most part.

I've never felt a need to go mobile any lower than 10M though I have
put some thought into shortning 160M antennas.

One concept I started playing with but never finished was the folded
monopole, i.e. half of a folded dipole, but with more than one "folded"
element in an attempt to get the radiation resistance up.

--
Jim Pennino

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