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Re: [TowerTalk] Fwd: Isolated Mode Antenna Technology

Subject: Re: [TowerTalk] Fwd: Isolated Mode Antenna Technology
From: jimlux <>
Date: Mon, 21 Dec 2009 21:07:21 -0800
List-post: <">> wrote:
> Trying to dechiffer the formula with my rather rusty knowledge, I see
> a radiating system (yes, antenna) there you, by exiting the
> conductors in different places manage to generate two different
> antennas that are isolated from each other. Not that hard to
> understand. You, probably have two dipoles (as the antenna is small)
> that radiates to different polarizations. You have the same thing
> with two crossed yagies or two helix with different rotations. As
> they radiate two different field (AKA orthogonal fields) they don't
> interact and are therefore isolated from each other even if they
> occupy the same area.

Exactly the idea
> I tried something similar (many years ago with a repeater antenna
> there I tried to isolate the transmitter and receiver antennas from
> each other. I was only successful to get some 15 dB isolation at
> best.)

And that's the challenge... 15 dB of isolation (which is tough to get, 
over a broad band) implies a fair amount of correlation if both antennas 
were used for receive (as in the article)
> I am sure the cell phone gadget manufacturer will adopt this antennas
> as is show (at least on paper) some improvements.

or, at least, the inventor hopes so...


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