🚀 go-pugleaf

On Tue, 13 Jul 2010 08:41:11 -0700, John Slade <hhitman86@pacbell.net>
wrote:

>> however, everyone is suddenly an rf engineer and thinks they have all
>> the answers, even when apple themselves haven't completely figured it
>> out.
>
>     There is nothing to figure out. The antenna is in a bad 
>place.

Ummm... I are an RF Engineer (and I'm enjoying all the speculation). I
also design and model antennas in my spare time:
<http://802.11junk.com/jeffl/antennas/>

It's not the location of the antenna.  The same antenna design located
anywhere on the phone will cause the same problem.  I don't think
anyone has tried it but I suspect that the BlueGoof and Wi-Fi
performance might also suffer when the other antenna is touched.

I posted my guesses previously (high impedance antenna with
excessively high Q) and am waiting for a chance to rip into the guts
of an iPhone 4 to see how the antenna is really designed.  The inside
photos that I've seen don't show enough.

Drivel:  I wonder if the black silicon rubber prophylactic that Apple
wraps around the phone is doped with carbon black for static
reduction.  That should make a nice RF attenuator and/or slightly
conductive "short".

10 Things Apple Can Do to Fix iPhone 4 Antenna Woes 
<http://www.eweek.com/c/a/Mobile-and-Wireless/10-Things-Apples-Can-Do-to-Fix-iPhone-4-Antenna-Woes-492275/>

AppleCare: The iPhone 4 Update Won't Solve the Antenna Problem
<http://gizmodo.com/5580587/applecare-the-iphone-4-update-wont-solve-the-antenna-problem>


-- 
Jeff Liebermann     jeffl@cruzio.com
150 Felker St #D    http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann     AE6KS    831-336-2558