Re: NEC-LIST: Why coil-load?

At 12:57 PM 2/16/2005, Roy Lewallen wrote:
>I'd be surprised to see any significant difference between NEC-2 and NEC-4
>for an above-ground model like this.
>
>I concur wholeheartedly with the approach. For reasons that are mysterious
>to me, the vehicle is generally overlooked in the discussion of mobile
>antennas. The vehicle is the other half of the asymmetrical dipole being
>fed, and its radiation is at least as significant as that of the "antenna".
>
>Roy Lewallen

There is some published literature on considering the vehicle.
For instance:
Brian Austin & Kevin Murray, "The Application of Characteristic-Mode
Techniques to Vehicle Mounted NVIS Antennas" IEEE Ant & PRop, v40, #1, Feb
98, p7-21\

Austin & Liu, "Assessment of vehicle-mounted antenans for NVIS
applications" IEE Proceedings Microw. Ant. Prop. v149, #3, Jun 2002

Austin & Liu, An Optimised Vehicular Loop Anenna for NVIS Applications, HF
Radio Systems and Techniques, Conf. Publ. #474, IEE, 2000

As far as coils go, the following might be of use:

B.A. Anicin, D.M.Davidovic, etc. "Circuit Properties of Coils"
IEEE Proc.-Sci. Meas. Technol. V144, #5, Sept 97

Starts with Pocklington's work, Sommerfeld did skin and proximity effect,
and moves on.
There's also apparently a paper by Ollendorf (1926), Hallen(1930), and
Roubine(1952) which are relevant.

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James Lux, P.E.
Spacecraft Radio Frequency Subsystems Group
Flight Communications Systems Section
Jet Propulsion Laboratory, Mail Stop 161-213
4800 Oak Grove Drive
Pasadena CA 91109
tel: (818)354-2075
fax: (818)393-6875

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