NEC-LIST: helical antenna

Firstly, I want to thank Roland Mueller for his suggestion of using
small loop antenna or a ferrite loop-stick antenna to avoid having too
long antennas when working in low frequencies. I also thank Max
J. Schmitt who suggested the use a ferrite-loaded dipole.

However, I don't have enough information about helical antennas in the
normal mode. In this respect, it will be a pleasure if someone furnish
me with some references about these types of antennas. Books (e.g., by
Kraus, Balanis etc) generally talk about the axial mode (i.e.,
dimensions greater than the wavelength ) and little about the normal
mode (i.e., dimensions insignificant with respect to the wavelength).
Furthermore, I would like to know the relationship between the
geometry (circonference of turns, their spacing, their number, the
total length) and the central frequency.

In general, information I found about loop-ferrite antenna is for the
reception and not emission. References in this regard will be highly
appreciated.

Has a helical antenna using NEC-2 been modelled by soneone? If yes, I
suppose he used the Helix/Spiral Specification (GH) card.

Thanks for your usual co-operation.
Best regards.

LUTZ Pascale
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| Pascale LUTZ | e-mail : pascale.lutz_at_univ-pau.fr |
| Laboratoire d'Imagerie Geophysique | |
| Universite de Pau | Tel: 33 (0)5 59 92 31 74 |
| et des Pays de l'Adour | Fax: 33 (0)5 59 92 31 86 |
| Avenue de l'Universite | |
| 64000 Pau | |
| France | |
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Received on Tue Apr 04 2000 - 04:00:06 EDT