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Old 05-28-2011, 12:20 PM
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If you are interested in the subject of Fractal/Constructal properties of nature i would advise you to refer to my other post:

Quote:
Trees as radiant energy collector

to give a little taste of it (from my latest posting):

From the article:

Quote:
This apparatus was connected up to one of Mr Rogers’ latest buried antennas --- a single rubber-covered, stranded copper cable, extending westward for a distance of 4,000 feet, so as to be in a plane with the high-power European radio stations. This cable is encased in iron pipe (gas pipe), each 20-foot section of which is insulated from the abutting sections by means of a rubber hose (garden hose) slipped over the pipe ends for a few inches. This is buried in a dirt trench about 3 feet deep, filled in with soil. The cable is insulated at the free end and is connected up as in Fig. 2. The rubber covered wire alone has been used in all sub-aqueous tests, and gives fine results when simply buried in the ground, the decay not being so rapid as probably would be imagined. This latest aerial in the iron pipes is a new development and experiments are still going on with it. It works wonderfully well. The 4,000 foot aerial here described is best suited to receiving radio lengths of 6,000 to 16,000 meters. For shorter wavelengths aerials of smaller dimensions are employed.

Doesn't it resemble the root of a tree:

Quote:
Tree roots possess an apical meristem (meristematic tissue found at the tip) that is protected by a root cap. The root cap sloughs off its oldest tissues to provide lubrication as the root is pushed through the soil. As the apical meristem grows, it cuts off new cells through cell division, and a zone of elongation is formed directly behind it. In this area, the new cells are enlarging and differentiating into specialized root tissue.

The rate of root growth is quite variable throughout a growing season. Roots usually begin to grow before the tree top does, although root growth is cyclic and responds to environmental changes such as soil depth, water supply, aeration, mineral supply, and temperature.




one more info:

Quote:
a single rubber-covered, stranded copper cable, extending westward for a distance of 4,000 feet,
the answer to that is as follows:

Fractal Antennas: A Novel Miniaturization
Technique for Wireless Communications


Quote:
Wireless applications, particularly with multiple
resonances, put new demands on antennas pertaining to size, gain,
efficiency, bandwidth, and more. One promising approach in this
regard is to use fractal geometries to find the best distribution of
currents within a volume to meet a particular design goal. In the
miniaturization of wire antennas it has been found that the
electromagnetic coupling between wire angles limits the reduction
of the resonant frequency with increasing wire length.
Recent
efforts by several researchers around the world to combine fractal
geometry with electromagnetic theory have led to an emergence of
new and innovative antenna designs. Unique properties of fractals
have been exploited to develop a new class of antenna-element
designs that are multi-band and compact in size and have been
shown to possess several highly desirable properties, including
multi-band performance, low sidelobe levels, and its ability to
develop rapid beamforming algorithms based on the recursive
nature of fractals. The purpose of this paper is to introduce the
concept of the fractals and to provide a study and implementation
of rapidly growing field of fractal antenna engineering including
recent developments. The simulated results for Koch fractal
antenna using AWAS and NEC are also provided.
your underground fractal/constructal antenna:



links:

http://www.academypublisher.com/ijrt...0205172176.pdf
ISUE - Tree Roots



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