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Experts Explain iPhone 4 Antenna Problem
CWmike writes "Reports of call and data signal strength problems in the new iPhone 4 have a basis in fact, a hardware expert said Thursday. Later in the day, Apple acknowledged that holding the iPhone 4 may result in a diminished signal that could make it difficult to make and maintain calls or retain a data connection. 'Gripping any phone will result in some attenuation of its antenna performance with certain places being worse than others depending on the placement of the antennas. This is a fact of life for every wireless phone,' Apple said in a statement issued to several media outlets, including PC Magazine, which had run tests earlier Thursday. 'If you ever experience this on your iPhone 4, avoid gripping it in the lower left corner in a way that covers both sides of the black strip in the metal band, or simply use one of many available cases.' Scores of new iPhone owners confirmed the reception problem in a string of more than 360 messages posted to a thread on Apple's iPhone 4 support forum."
A blog post from an antenna design company explains that the reception problems are probably the direct result of phone design adapting to FCC requirements.
It'll insulate the metallic ring that's "part of the antenna system", which might mean "the antenna" or might mean "some other element that helps the antenna do its work" (i.e. a resonant grounding piece). Antennas are tuned, resonant, structures...think of a tuning fork that needs to oscillate at a certain frequency. Bridging the gap between the two exposed elements changes the electrical characteristics of it such that the antenna becomes detuned and reception is impaired. By applying a case, your hand can no longer come in contact with the ring, so the antenna isn't as severely detuned and the cell phone signal isn't as attenuated. I say "as severely" because there will always be some impact when your hand is in reasonable proximity to the device, but it won't be of the magnitude that direct contact would be.
Of course, apple could have easily designed the phone with with a some plastic along the side, but this would go against their aesthetic "vision". Anyone who has used an Apple mouse (*any* Apple mouse) knows that ergonomics takes a back-seat to physical appearance. Always.
I can hold my Android phone any way I want to and I don't see any loss of signal strength, so apparently it *is* possible to design a working phone within current SAR limits...
I wasn't aware that government regulation forced BP to cut corners and undertake a risky well closure strategy, ignoring evidence that the BOP was damaged. Which regulation was that?
They already had the phone inside the case in previous generations, the external antenna does improve the signal. No need to throw the baby out with the bathwater. A light non-conductive coating would work perfectly well.
"There is more worth loving than we have strength to love." - Brian Jay Stanley
In a sane world there's no way that my theory can be right, but here it is:
The lab tests were done at Apple HQ, where AT&T has a tower in order to keep Steve Jobs happy -- plenty of signal even with the defect. The field tests were done with the rubber disguises on, so it didn't affect them.
It Just Works. As long as you hold it the way Steve Jobs instructs you to. Coming from the supposed experts on user interface this is a major let down. Users holding the phone the way that comes most naturally to them are not wrong - the product is wrong.
To summarise the summary of the summary: people are a problem. ~ h2g2
Grounding, or effectively grounding (by say, shorting two ends of a dipole) an antenna will *always* result in loss of signal, even when starting values are ideal. But regardless of how it was missed, the fact that it was missed at all means one thing: inadequate testing.
https://www.eff.org/https-everywhere
Grounding, or effectively grounding (by say, shorting two ends of a dipole) an antenna will *always* result in loss of signal, even when starting values are ideal.
I think the bigger problem is that with all of Apple's "expertise with hardware", they would design something with this kind of flaw.
Living With a Nerd
I think the reason they may not have found this in testing, is because it seems that you have to have slightly sweaty hands to trigger the problem. Just after running through an airport I was able to replicate the speed drop, but sitting on the plane a little later I could not see a network speed drop no matter how tightly I gripped the edges.
The tested mostly in winter, now it's summer - leading more people to have this problem.
"There is more worth loving than we have strength to love." - Brian Jay Stanley
I don't think this was missed at all. It's like any of the other "defects" that have showed up in Apple products. I'm tempted to believe that Apple knew quite well about this, but decided to go with it anyway because a) fixing it would involve removing some of the "sleek" factor and b) they knew that there would be such mass hysteria over acquiring the new product that it wouldn't matter - at first. It's all about taking calculated risks.
That having been said, it's precisely this attitude that destroyed my fan loyalty several years ago- I simply got tired of being bent over by Apple's marketing prowess. I still buy an Apple product every now and then, but the days of drooling all over myself at the mere mention of a new Apple product are LONG gone.
I'm pretty sure that's why they designed the bumper accessories to be the way they are. They turned a product defect into a way to sell an overpriced accessory to fix their devices shortcomings - and it's working! The Jobsian management style never ceases to amaze me with its outcomes.
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