Re: NEC-LIST: Re: Slot antenna question

At 12:06 PM 7/8/2004 -0700, drcuthbert_at_micron.com wrote:
> -----Original Message-----
>From: drcuthbert
>Sent: Thursday, July 08, 2004 1:04 PM
>To: nec-list_at_gweep.ca
>Subject: Slot antenna question
>
>Is my theory of a slot dipole correct?
>
>* The conductive sheet is infinite
>* The sheet is vertical
>* The slot is horizontal
>* The slot is fed across the center
>* The radiation occurs at the ENDS of the slot- these short,
>vertical ends act as two short vertical dipoles
>* Radiation from the horizontal slot is cancelled
>
>A NEC-2 model of works and agrees with this.
>
> Dave Cuthbert

Think Babinet here... Your slot is the same as a conductive rectangle in
free space, fed across the middle, and would radiate as you say.

That said, many times, the slot is 1/2 wavelength long, very narrow, and
you feed it at the middle of the long side... like a wire dipole.

FWIW, a patch antenna is a lot like a slot. It's the edge of the patch that
does the radiating.

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James Lux, P.E.
Spacecraft Telecommunications 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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