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苹果的天线问题主要是由于外围天线的绝缘层设计失败，导致可以用手指改变天线的阻抗，信号功率出现衰减，以至于手机内部的收发机不能正常处理信号，最终看上去漂亮的iPhone 4没有实际功能，成了一个花瓶。 在星期五关于iPhone 4天线问题的解释中，苹果CEO Steve Jobs使用了一些幻灯片来说明，当握住手机的方法不对时，其他的智能手机也存在同样的信号接收问题。然后苹果展示了一些智能手机的视频，包括iPhone 4，当采取不同的握机方法时，它们的信号强度都出现了衰减。
这些演示的目的都是为了证明iPhone 4的天线问题在智能手机中不是特殊的。然而，它有所不同。
Apple.com 自己也清楚地表示iPhone 4的天线问题和其它的智能手机所面对的一般的干扰问题不一样，包括之前版本的iPhone，这些智能手机都包含内置天线。iPhone 4与其它智能手机在设计上的差别显而易见：它允许手指桥接天线，改变了天线的属性。对于那些内置天线的手机，这个问题不会发生，除了Jobs在星期五想要说明的。
“The external antenna on iPhone 4 is located in the stainless steel band,” reads the caption under a photo indicating where the problem exists on Apple’s page (image to the right). “The attenuation weak spot is the black strip in the lower left corner of the band.” For all of the other smartphones on that page, the corresponding captions describing grip-related interference refer to the “location of internal antenna” or “main internal antenna,” rather than to an “attenuation weak spot.”“iPhone 4的外置天线设计在外壳的不锈钢圈上，”一张出现在苹果主页上显示这个问题的图片（右图）下方的说明文字。“天线的衰减弱点就是钢圈左下角的黑色覆盖物。”主要上所有智能手机相应的说明文字，都在描述由于“内置天线”或者“内置主要天线”而导致的不同握机方式干扰，而不是描述“衰减弱点。”
Experts agree that the iPhone’s problem is different from that faced by other phones, regardless of Jobs’ protestations to the contrary.专家们都认为iPhone的问题和其它手机所遇到的问题不一样，除了Jobs的反对的申明意见。
Joe Banos — antenna expert, electrical engineer and COO of Wilson Electronics, which makes cellphone signal boosters for the car and the home — explained how the iPhone 4’s antenna issue differs from those of the other smartphones listed on Apple’s comparison page. Banos has nothing against Apple or AT&T, and would in fact like his company to partner with them one day, and he insisted that we make it clear that he has not even used the iPhone 4. However, its problem is so obvious from an antenna engineering standpoint that he didn’t need to hold it in his hand to see where its design went wrong.Joe Banos——天线专家，电气工程师和Wilson Electronics（一家制造车用和家用手机信号增强器的公司）的COO——解释了iPhone 4的天线问题和苹果主页上展示其它的智能手机是怎样的不一样。Banos并不讨厌苹果公司或AT&T，事实上还期待自己的公司有一天能和他们合作，并且他坚持我们应该说清楚他目前还没有使用过iPhone 4。但是，但是，对于一个天线工程师来说，它的问题很明显以至于并不需要他亲手拿着手机检查哪除了问题。
The iPhone 4 antenna’s feed point, located at the plastic strip separating the metal of the antenna, can be bridged by a human finger, which changes the capacitance of the antenna, causing an impedance mismatch that reduces the signal, which is why the problem affecting Apple’s external antenna does not affect the other phones listed on Apple’s comparison page.iPhone 4的天线馈点位于塑料覆盖物上，它用来分隔天线金属，而这个馈点可以被手指桥接，这就会改变天线的作用，导致阻抗失配抑制信号衰减。这就是为什么影响苹果外置天线的问题没有影响到苹果主页上那些用作对比的手机。
“Any time you touch the feed point, it’s kind of like squeezing the jugular vein on your neck, like the ‘Vulcan hold’ from Star Trek,” said Banos. “Apple says all phones have this problem — yeah, they have that problem after you fix the problem with touching the antenna.”“每次你接触到馈点，类似于用手指挤压你脖子上的颈动脉，就像星际迷航里面的’Vulcan hold‘一样，”Banos说道。“苹果说所有的手机都有这样的问题——是的，它们存在这个问题解决后触摸天线的问题。
He laid out the difference between the issue affecting the iPhone 4 and the one affecting phones in general as follows:他阐释了困扰iPhone 4的问题与困扰普通手机的问题的区别，如下：
Absorption (happens with all cellphones): Electromagnetic waves, such as radio frequency (RF) waves, penetrate materials differently based on their characteristics. Any time you wrap your hand around an antenna, the human tissue around is going to absorb some of the waves. “It’s just the laws of physics,” explained Banos.吸收（存在于所有的手机）：电磁波，比如射频波，由于它们的特性不一样，穿过不同材料的方式也不一样。只要你把手放在天线的周围，天线周围的人体组织将会吸收一些电磁波。“这是一种物理规律，”Banos解释道。
Impedance Mismatch (happens with iPhone 4): Any antenna at any frequency made out of any metal has a specific characteristic, called impedance, and the engineer’s challenge is to match the impedance of the antenna to the impedance of the transmitter and receiver inside the phone. “When you physically touch the antenna in that spot, you’re changing the impedance characteristics of the antenna,” said Banos. “You’re causing a mismatch – nothing to do with absorption.”阻抗失配（iPhone 4出现的问题）：由任何金属材料制造的处于任何频率段的任意天线都有一个叫做阻抗的属性，天线工程师的任务就是匹配手机内发射机和接收机的阻抗与天线的阻抗。“当你接触到天线上的那个信号衰减点的时候，就改变了天线的阻抗属性，”Banos说。“这造成了一种失配——和信号被吸收没有关系。”
Banos points out that the bumper Apple supplies to solve the problem is not thick enough to have a measurable effect on any absorption problem encountered by the iPhone 4. It’s beneficial effect is purely a result of the way it prevents one’s finger from touching the antenna’s feed point, solving the impedance mismatch issue.Banos指出苹果提供的用于解决这个问题的缓冲物厚度不够，没有度量iPhone 4遇到的吸收问题的作用。这种度量作用可以阻止手指接触到天线的馈点，从而解决阻抗失配的问题。
It may seem as if we’re belaboring the point here, but it takes some work to clear up the confusion Apple is spreading about cellphone antennas. In some places, the company implies that the impedance mismatch problem and the absorption problem are one and the same. In others, the company acknowledges that a difference exists — for instance, with the phrase “attenuation weak spot” only being used to reference the iPhone.关于这一点，我们似乎做了过多的说明，但是弄清楚苹果传播的手机天线问题是需要一定时间的。在某些场合，苹果公司声称阻抗失配问题和吸收问题是同一问题。而在其它场合，它有说两者的区别是存在的——比如，“衰减弱点”这个词只用在iPhone上。
Nonetheless, Jobs said, “This is life in smartphone world,” ignoring the difference between the absorption and impedance mismatch problems. “Most every smartphone we tested behaved like this… The heart of the problem is that smartphones have weak spots,” he added, conceding, at least, that Apple “made it very visible.”尽管如此，Jobs说，“这是智能手机领域的正常现象，”忽略了吸收和阻抗失配问题之间的区别。“我们测试的大多数手机都表现出这样的问题……问题的核心事智能手机都有弱点，”他继续说，不情愿的承认，至少，苹果公司“揭示了这个问题。”
According to Jobs, the iPhone 4 suffers from a problem that affects all phones; it just happens to be more “visible” on the iPhone 4, which isn’t really a big deal. But if other manufacturers were experiencing this problem, they too would issue free antenna covers. They are not doing so.根据Jobs所说的，iPhone 4所遇到的问题困扰着所有其它的手机；只不过这个问题在iPhone 4上更明显，并且不是什么大问题。但是如过其它的制造商也遇到这种问题，他们也会发放免费的天线套。苹果并没有这么做。
“Apple’s attempt to draw RIM into Apple’s self-made debacle is unacceptable,” said RIM chief executives Mike Lazaridis and Jim Balsillie said in a Friday statement. “Apple’s claims about RIM products appear to be deliberate attempts to distort the public’s understanding of an antenna design issue and to deflect attention from Apple’s difficult situation.”“苹果努力把RIM卷入苹果自己的失败中是不可接受的，”RIM的CEO Mike Lazaridis和Jim Balsillie在星期五的说明中讲到."苹果关于RIM产品的说法像是故意在歪曲公众对于天线设计问题的理解并且试图转移大家对苹果公司困难处境的关注。
Nokia also took a dig at Apple. “As you would expect from a company focused on people, we prioritize antenna performance over physical design if they are ever in conflict,” said the company, implying that Jobs’ designers ignored customers’ needs by prioritizing physical design over antenna performance.诺基亚也在嘲笑苹果。“作为一家致力于个人通讯的公司，正如你所期待的一样，我们会优先考虑天线性能而不是物理外壳设计，如果它们存在冲突的话，”该公司说道，暗指Jobs的设计者们忽略了用户的需求，过于重视物理外壳设计。
It’s hardly surprising that Nokia and RIM would bristle at Jobs’ attempt to conflate iPhone 4-related problems with those of cellphones in general. After all, Apple itself admits, however circuitously, to a noteworthy distinction between an internal antenna, whose signal can be blocked by vague obstructions, and an external antenna that loses signal power when a finger touches its “attenuation weak spot.”没有什么奇怪诺基亚和RIM被Jobs的意图激怒，Jobs意图混淆iPhone 4的问题与通常智能手机的问题。毕竟，苹果自己也承认，不管是多么的委婉，内置天线和外置天线有显著的差别。内置天线的信号会被不确定的阻碍物隔断，而外置天线会由于手指触碰到了“衰减弱点”而产生信号功率损失。
Apple has not published any data that would allow independent review of its explanation.目前为止，苹果还没有发表过任何数据表示允许独立评估它的解释。
Read More http://www.wired.com/epicenter/2010/07/apples-antenna-problem-is-different/all/1#ixzz0uPbeqHPVbY TheZEN