Re: NEC-LIST: GPR antennas

Pascale,

I would suggest using a small loop antenna or a ferrite loop-stick
antenna. A 10:1 bandwidth would be difficult to achieve, unless your
VSWR requirement is not too tight.

All the best,
Roland

Pascale Lutz wrote:

> I am working on an impulse GPR (Ground Penetrating Radar) project in
> the 5-50MHz band. My goal is to model and consequently fabricate an
> antenna in this band of frequencies.
>
> In GPR we generally use resistive dipoles, but the problem with this
> type of antennas is that their length is of the order of the
> half-wavelength. So for low frequencies, the antennas are very
> long.... For example an antenna with a central frequency of 8 MHz on
> the ground with a relative dielectric constant of 3.5 is as much as
> 12.5 m long!
>
> I would like to know if there will be any suggestions on how these
> antenna lengths can be reduced or rather if any more convinient
> antenna can be prescribed for me.
Received on Thu Mar 30 2000 - 06:13:55 EST