On Mon, 24 Apr 2017 20:33:18 -0400, rickman wrote:

On 4/24/2017 8:03 PM, pez wrote:

On 24.04.2017 19:23, rickman wrote:

Ok, I was invited to start a new thread and the very strange person
who invited me to do this seemed to say he would not be participating,
so here it is.

Anyone have experience with fractal antenna design? I know I have
seen a little bit about it, but no theoretical analysis.


= https://www.antennex.com/preview/Jan504/intro-fract.htm

That was very interesting.

Ditto.

I guess I was thinking someone would analyze fractal antennas like they
do dipoles, etc., calculating the current and voltage distribution. But
I guess that is just too complex and the simulators are used to "see"
what is happening.

Fractal antennas can be modeled. See:
http://www.fractenna.com/whats/whats.html
and scroll down to: "HFSS New FRACTAL Tool". Note the model on the
screen. HFSS is a rather expensive modeling program.

The previous URL
https://www.antennex.com/preview/Jan504/intro-fract.htm
includes some downloadable fractal antenna models (NEC files) at:
http://download.antennex.com/software/model/fractaleq1.nwp
The .nwp file is for NEC-Win Plus, which is thoroughly proprietary.
The program 4NEC2 includes 5 fractal antenna models in the
\models\fractals\ directory. Just grab the 4NEC2 program from:
http://www.qsl.net/4nec2/ (free)
which includes models for fractals and large number of other antennas.
Getting the program to play is easy enough. Understanding the results
is far more difficult.

Hint: For anything in 4NEC2 that has a frequency sweep plot, open the
"Pattern" window and use the left right arrows to see what happens to
the antenna pattern at different frequencies.





--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558