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NNTP-Posting-Date: Mon, 09 Dec 2002 11:47:21 -0600
From: "Dave VanHorn"
Subject: Re: Chip antennas
Date: Mon, 9 Dec 2002 12:47:53 -0500
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> In general you can provide better radiation performance using embedded
> wire antennas.
That's what I figured.
> There is a compromise between a whip antenna and the chip antenna that
> be available on the market soon. It's called FWT antenna technology.
> basically it is a dielectrically loaded 3 dimensional antenna that offers
> 1/2 wave dipole performance in 1/8 of the volume traditionally required.
How is this different from the continuously loaded helical antenna?
(other than being way easier to build)
The helical is certainly resonant, but has relatively narrow bandwidth, and
not as much gain as a full sized version. I'm not aware of any "shrunken"
antenna that has equivalent gain to the full sized version. Seems to fly in
the face of physics, which is what got me started on this.
Given that the capture area is so much smaller, it seems impossible that it
could have as much gain as a full sized antenna, and given that antennas are
reflexive, the transmit side should suffer the same.
Note, I'm taking about the sort of helical where the diameter is small
relative to the wavelength, like the "firestick" antennas sold for CB.
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