Re: NEC-LIST: Cylinder connected to Ground by a Wire

>This is a restatement and update of my problem. Sorry for the long lines.
>
>The problem is to calculate radiation at low frequency from a 1-m
>diam. by 1-m long
>cylinder connected with a 0.01-m radius, 1-m long axial wire to a
>ground plane. The range of
>frequencies is from 10 to 100 MHz, i.e., with the 1-m dimension corresponding
> to .03 to 0.3 wavelengths and the wire radius .0003 to .003
>wavelengths. The prominent
> response feature expected is LC resonance, where C is the
>capacitance of the cylinder
> to the ground plane and L is the inductance of the wire. For a
>wire with radius .01 m
>this should occur around 30 MHz (i.e., wire length of ~0.1 wavelengths).

Victor,

I am no help with regard to modelling a cylinder by patches, but I
have modelled cylinders by a wire grid --- I did it by hand --- but
there are better ways to model structures nowadays. My circular
cylinder was a 20 sided polygon. The wire grids were square. A
cylinder im diameter, 1m long, with a 1m feeder wire looks like no
problem to me.

I used NEC-4 double precision, because my ground plane was also a
wire grid "plate" above ground, with or without connection to the
ground.

The problem is if you want to make the GP circular.

Jack

-- 
John S. (Jack) Belrose, PhD Cantab, VE2CV, VY9CRC
Life Senior Member of the IEEE
TA ARRL, Fellow Radio Club of America
Member AWA, Life Member QCWA
Radioscientist Emeritus Researcher
Communications Research Centre Canada
PO Box 11490 Stn H
OTTAWA   ON   K2H 8S2
CANADA
e-mail  john.belrose_at_crc.ca
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