Hi Mike,

For what you are saying to be true, the metal foil of the "internal
antenna" would have to be connected (either directly or capacitively) to
the phone's ground. I haven't seen one of these "internal antennas" but I
don't see how it is coupled to the phone.

Sean


On Wed, 29 Aug 2001, Mike Kendall wrote:

> My guess is that it does increase the performance of the antenna and this is
> why I'm saying it.  With a plastic bodied telephone and a whip that does not
> have a decent counterpoise (the newer units are going to have a fractal
> antenna to allow transmission on cell phone bands and receipt of GPS signals
> to comply with the FCC requirement so the whip is not applicable with them).
> With the metal of the "battery antenna enhancer"....even if it was a piece
> of copper foil tape instead of the fancy looking geometric shape that they
> get to charge you for, there should be a better capacitive coupling into the
> hand of the person holding it.  My guess is that the cell phone user's body
> becomes a human counterpoise electrically equivalent to a very lossy ground
> on the marconi cell phone antenna (loaded whip) along with the fact that the
> first electrical part of that is the foil tape itself.  Half of a Marconi is
> the ground plane.
> Mike Kendall

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