All real antennas have something called an antenna factor which is the
ratio of actual E field intensity (in a uniform field) to voltage at
the terminals. In the real world, this is always greater than 1
meaning that in a 1 volt/meter field, you read less than 1 volt at the
terminals. The art of calibrating antennas involves determining this
factor as a function of frequency.
Cliff Kraft
chkraft_at_lucent.com
Grant Bingeman wrote:
>
> I have a dumb question. Assume you have a linear field of one volt
> per meter. Now assume you have a wire one meter long aligned with
> that field and loaded with an impedance at its center in such a way as
> to maximize the voltage induced across that load. Is there a simple
> relationship between that induced voltage and that impinging field,
> and what restrictive circumstances must be applied? Must the load be
> the complex conjugate of the wire's self impedance? Must the wire be
> suspended in free space? Must the wire be infinitely thin? Must the
> wire be very short compared to a wavelength? When, if ever, will the
> induced voltage equal the field intensity?
>
> Grant Bingeman
Received on Thu Jun 25 1998 - 10:05:46 EDT
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