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Author Topic: Fractal Antenna  (Read 2984 times)
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Lee Oliver
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« on: May 07, 2010, 09:43:23 PM »

I made a fractal antenna for my brother's car.  I bent a length of wire into a koch curve because I heard it gets a better signal than regular straight antennas. He hasn't tested it yet, but I hope it works.  Has anyone else tried this?

If it does work I will post pictures.
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« Reply #1 on: May 08, 2010, 04:21:59 PM »

   I made a fractal antenna for my brother's car.  I bent a length of wire into a
   koch curve because I heard it gets a better signal than regular straight antennas.
   He hasn't tested it yet, but I hope it works.  Has anyone else tried this?

Never heard of one used for a car.  (I assume you mean like the ones mounted on the outside.) 
But there are a few topics in this Forum about fractal antennas:

http://www.fractalforums.com/index.php?topic=741.0
http://www.fractalforums.com/index.php?topic=561.0
http://www.fractalforums.com/index.php?topic=360.0
http://www.fractalforums.com/index.php?topic=2.0
http://www.fractalforums.com/index.php?topic=42.0

   If it does work I will post pictures.

Why not post a picture anyway??  Would be nice to see what you created.    grin
 
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kram1032
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« Reply #2 on: May 09, 2010, 12:14:22 PM »

Somewhere also was an article about fractal metal plates on microwave packages to control where how much heat has to go in order to perfectly heat the food...

I constructed my own fractal antenna design (though, I'm pretty much certain, I'm not the first one who thought about that shape^^), being basically a sierpinsky-like pattern but with hexagons, rather than triangles or quads.

Like this: 7 hexagons, take out the one in the middle, replace them all.

Basically it approaches a Koch Snowflake but with a lot of (in the limit infinite) smaller Koch Snowflakes smiley

Like this:
http://www.tgmdev.be/curvesierpinskiobj.htm (scroll down a little)
But with Hexagons, attached to their sides, rather than to their corners.

I wonder, what that shape would do if used as antenna... Seeing a Koch Curve in one of your linked topics, I guess, it would do a rather nice job smiley

I constructed it with Blender, which is obviously not too good for fractals or for high accuracy at smaller scales: It's a more or less all-in-one freestyle artist tool, rather than a CAD program or one, optimized to fractal structures... But I could share a .blend or an .obj, if anyone is interested smiley
That then could be translated into data of a machine, that cuts out metal or something and that way you could try it out smiley

Edit: reading, what they say on the side, it's a rather useless one... "However, above 6 iterations, the size of the generated inner objects becomes so small ( in fact, close to a single pixel) that further iterations are useless, only increasing the time of curve drawing." - the pixel size is resolution dependend! And in those tiny graphics, they have on that site, my guess would be, that a six iteration version would already be way beyond the pixel detail... - But you get the idea of the shape smiley

Ok, found a Wiki for this:
http://en.wikipedia.org/wiki/Hexaflake

In my version, the middle part is missing, due to the slightly different construction. - Also, the internal Koch Snowflakes don't have triangluar tips right away but rather half-hexagons. - in the limit, that shouldn't make much difference, though...


EDIT2:
This must also give a great fractal antenna... but it looks harder to contstruate...

http://upload.wikimedia.org/wikipedia/commons/d/d9/Mandeltree.svg
« Last Edit: May 09, 2010, 12:52:10 PM by kram1032 » Logged
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