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Signal Pattern From a Router Dipole Antenna?

Last response: in Wireless Networking
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Anonymous
a b F Wireless
June 23, 2004 3:42:31 PM

Archived from groups: alt.internet.wireless (More info?)

Does the signal radiate out from the entire length of the dipole or
just from the tip?

Trying to determine the best position for the homeade reflector on the
dipole.

TIA
Anonymous
a b F Wireless
June 23, 2004 5:10:06 PM

Archived from groups: alt.internet.wireless (More info?)

On Wed, 23 Jun 2004 11:42:31 -0700, Hamish McStill <noone@nowhere.com>
wrote:

>Does the signal radiate out from the entire length of the dipole or
>just from the tip?

There's no real point source for the RF. Well, there's the "phase
center" which is mostly used in reference to cantennas and dish feeds.
For a 2.4GHz vertical coaxial antenna, it would be 1/4 wavelength from
the tip or 3.25cm down from the tip. Well, it might be a bit lower
because the rubber covering of the antenna moves the end of the
antenna down slightly. Up or down a few cm isn't goint to make any
difference for a coaxial dipole with a theoretical -3dB vertical
beamwidth of perhaps 120 degrees.

>Trying to determine the best position for the homeade reflector on the
>dipole.

See:
http://www.freeantennas.com/projects/Ez-10/
for such a corner reflector.


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Jeff Liebermann jeffl@comix.santa-cruz.ca.us
150 Felker St #D 831-336-2558
Santa Cruz CA 95060 AE6KS
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