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Design Flaw in iPhone 4, Testers Say
Richard Clark Inscribed thus:
On Mon, 12 Jul 2010 21:54:17 -0500, tom wrote: On 7/12/2010 9:46 PM, Richard Clark wrote: The only thing that remains a mystery, for me if for no one else here, is the literal specification of the antenna. Google (gasp) fails me. 73's Richard Clark, KB7QHC And that does seem to be the crux of the matter. What is the antenna? And what does it interact with that's not, be it part of the phone or part of the user? Hi Tom, The antenna is reported as being the metal trim that surrounds the perimeter of the phone. As that is much too large for the frequencies involved to be taken literally, there is more to the story that remains clouded. Maybe I'm wrong.... I think you're right. "Design Flaw" Someone messed up testing big time. If the loop (or dipole) is suitably matched, it doesn't give much polarization diversity. Perhaps no phone does anyway. Aren't cell stations vertically polarised. The one near me is, and one of the IF's is smack on 144.005 Mhz. Insofar as being "part of the user," we well know the EM of HTs and the hand/body contribution. If such were the case, then this would be an agnostic problem that users of all mobile phones would complain of (which mildly refutes what the gadget blogs dismissed). On the other hand, the über-hip, whose complaints are more vocal for their "pain," would be outraged at the notion of their simply enjoying the identical experience of techno-trash. Amazing what a 10 fold cost differential brings to your perception of quality of service. 73's Richard Clark, KB7QHC From a casual look at the phone the metal band seems to be a continuous loop. Its unlikely that there is a physical coupling between it and the RX/TX, so any tuner or coupling is going to be affected by the hand grasping it. Since suggestions have been made to hold the phone in a different place, I would guess that the coupling method is suseptible to adsorbtion effects and that the hot parts are near the base of the phone. FWIW Every mobile phone I've played with has the antenna and coupling circuitry near the top behind the display. 73's -- Best Regards: Baron. |
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