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Old October 23rd 07, 01:48 AM posted to rec.radio.amateur.antenna
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Default Fractal 10m Antenna

John Doe wrote:
"I have a lot of time on my hands - "

Kraus calls fractal antennas "artistic antennas". Kraus says: "Fractals
are structures that preserve their shape at different scales."

In Figure 21-50 of page 774 of the 3rd edition of "antennas" (If you
don`t have it, you need it), Kraus writes:
"Note the impedance fluctuations of the fractal antennas compared with
the plate and square loop."

Not a ringing endorsement but there may have been progress since the
book was published in 2003.

Best regards, Richard Harrison, KB5WZI

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Old October 25th 07, 07:21 PM posted to rec.radio.amateur.antenna
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Default Fractal 10m Antenna

John Doe wrote:
"I have a lot of time on my hands."

I recall the Fractenna man, Dr. Chip Cohen, used to define fractals as
self similar elements assembled to cover a wide range of frequencies.

That roughly conforms to Kraus, "structures that preserve their shapes
at different scales."

Kraus` conical spiral and log periodic antennas in Figure 310 on page 68
of the 3rd edition of "Antennas" also seem to fit the repeating
structures of different scales designed to produce very broad bandwidth
with moderate gain and might be called fractals.

Best regards, Richard Harrison, KB5WZI

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