NFC, Unlikely

The most recent rumor is that this mysterious square chip (occluded by an EMI can) is an NFC combo controller and antenna, based purely on its square dimensions.

The NFC "chip" ensquared in red

Given the primarily metal backside of the new iPhone, it's highly unlikely that NFC is in the cards for this generation. In fact, given the very little space at top and bottom dedicated to those glass RF windows, you can almost entirely rule it out.

NFC operates on the 13.56MHz ISM band, which has a relatively large wavelength, at 22.1 m. Making a traditional dipole antenna that radiates at all given the constraints of a smartphone package is thus a big challenge, considering that smartphones are maybe 5-inches tall at maximum, to say nothing of the supposed upcoming iPhone's longest linear dimension.

From the NFC Forum Analog Specification

As a result almost all NFC antennas are big inductors and work using a magnetic field coupled between a host and peer device. Since we're talking about an inductor, NFC antennas use as big of a coil of wire as possible with as many wires as possible tightly wound together, and thus often use as big of an unbroken 2D plane as they can get on the device. In the smartphone space, basically all NFC antennas to date are simply flat spirals on a PCB. Whether this gets hidden on top of the battery like what Samsung has done in recent devices, or printed on the back battery cover like earlier devices, the antenna is ultimately a big square or circle with as big and dense of a coil as possible.

Galaxy Nexus Battery and NFC Antenna Coils (Courtesy iFixit)

Getting a good inductor into the device is important because how much inductance your antenna has will determine maximum coupling distance and ease of alignment. It shouldn't need saying, but having a huge ground plane (the unibody metal back case) in the way of your NFC antenna will seriously degrade performance, thus only the top or bottom windows are logical places to put it.

It's this last point which makes us very skeptical about the top or bottom RF windows being used for a relatively small NFC loop – not because such a thing is impossible – but rather because of how terrible the resulting ease of alignment and maximum coupling distance would be. Most NFC implementations at present place the inductive coils as near to the center of the device as possible, partly because this is the most optimal way to maximize the area which can be dedicated to it, partly because it makes alignment natural. With an NFC antenna at the extreme top or bottom, alignment with non-iPhones (for example, payment tokens or reader tags) becomes a much more confusing task, and that doesn't seem like the Apple-like level of polish everyone is waiting for to drive NFC adoption.

There's also a healthy number of signaling pins in the flex cable leaving the mystery chip, some of which appear to be signaling for the front facing camera which is part of the assembly, others for earpiece, proximity, and ambient light sensor. In addition this assembly also is obviously the assembled display and touch stack. When you consider the inclusion of in-cell touch sensing which has been rumored for the upcoming iPhone, and the requirement for time multiplexing of both display driving and touch sensing signals (to mitigate interference and make this possible), it's more likely that the components under that heavily shielded (and grounded with a big spring finger) EMI can are the touch and display controller combo that need to work in conjunction for in-cell to be possible.

The inclusion of Passbook in iOS 6 is the most often-cited piece of evidence for Apple including NFC, which seems a bit paradoxical since Apple hasn't disclosed at all whether it would favor NFC or a Bluetooth LE (low-energy) or even QR code based payment token through that gateway.

Cellular Connectivity: LTE Expected WiFi, Battery & Conclusions


View All Comments

  • gilesrulz - Tuesday, August 28, 2012 - link

    You're admittedly not an Apple user or a future Apple user, so why would Apple build a phone for you?

    While there may be a small population that share your desire for NFC and mobile payments generally, for most it is a solution looking for a problem (at least in the US - I have read interesting use cases for the developing world).

    As for the proprietary port, there was an exception put into the law that allows for adapters to USB, which is what Apple has bee providing since the law went into effect.
  • alxx - Tuesday, August 28, 2012 - link

    NFC I'd prefer not to have until the security bugs are worked out it.

    Personally I prefer a phone that fits in my pocket (shirt and pants) and doesn't need a bag or belt clip to carry it
  • mantikos - Tuesday, August 28, 2012 - link

    Stop the hobby product BS, its a failed product...there is nothing known as a hobby product...if Surface flops tomorrow, would you be kind enough to call it just a 'prime the pump' product because MSFT called it that?! Reply
  • gilesrulz - Tuesday, August 28, 2012 - link

    The have sold more than 4.2 million of them (2nd Gen). It is not a "failed product" or a "flop". Reply
  • jamyryals - Tuesday, August 28, 2012 - link

    Exactly right, it's only a hobby product for Apple because in comparison to their other revenue streams it's tiny. For almost any other companies selling 4 million of anything would be a huge success. I bet Google wishes they'd sold even 1 million Qs. Reply
  • KoolAidMan1 - Tuesday, August 28, 2012 - link

    How is it failed? It sells more than the XBox 360, that's pretty successful for a consumer gadget.

    It may be a hobby compared to an iPhone or iPad, but anything else is small in comparison. The iPhone alone makes more revenue and profit than Windows and Office combined.
  • Doormat - Tuesday, August 28, 2012 - link

    Any word on whether its feasible for IGZO screens or not? 50-90% lower power consumption. Reply
  • swb311 - Tuesday, August 28, 2012 - link

    IGZO is not for mobile right now. It's using In-Cell which might be confusing. IGZO is a replacement or different type of LCD which may end up in an eventual iTV or newer iMacs but definitely not in phones any time soon. Reply
  • HisDivineOrder - Tuesday, August 28, 2012 - link

    Please, please let them update the iPod Touch. It's beyond long in the tooth. Hell, I won't mind if they discontinue the iPod Touch line in favor of an iPad Mini line that is essentially the same thing at the same 4" diagonal of the iPhone, put the 7" iPad in as an iPad Air, and let the iPad become the Big-Daddy Pro of the iPad lineup. Reply
  • Ethaniel - Tuesday, August 28, 2012 - link

    I agree, I would love to see the iPod Touch updated, but no, I don´t want them to discontinue it. You have 90 percent of the iPhone´s functions without having to put a provider´s "ball and chain" in your ankle... oh, wait...

    My point is, I want a "tablet" that fits in my pocket. The closest thing so far without breaking the bank where I live is the current iPod Touch. If there are no updates, I guess I´ll grab the current gen.

Log in

Don't have an account? Sign up now