Re: NEC-LIST: Evaluating Resonant Frequency & Bandwidth (-3dB)

Good day Victor,

Not to my knowledge. If you have an idea of where the resonant frequency
is, you can do a frequency sweep around there. This takes more computation
time but less console time than using, by hand, a more sophisticated search
method such as bisection or golden section. Once you have spanned the
resonant frequency, you can use the impedance values at two closely-spaced
frequencies to find the Q and bandwidth according to any of several
closely-related formulas. If you don't have a clue about where the resonant
frequencies are, you will have to do a large-step frequency sweep to
discover the character of the antenna in question. Since antennas have, in
general, alternating low and high resistance resonances, and the lowest
frequency one depends on whether the antenna looks like a capacitor or an
inductor to begin with, and the lowest resonant frequency should be related
to the driven element's size in wavelengths, you can get a rough idea of
where you're at from the geometry.

Regards,
Doug Miron

"Victor Marchesini" <marchesini_at_ieee.org> writes:

Hi,

Is there any "easy" way to evaluate the Resonant Frenquency and the
Bandwidth using the NEC?

Thanks,

Victor Marchesini

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