Thursday, September 27, 2018

iPhone XR trades 4x4 MIMO for greater antenna gain and higher EIRP

iPhone XR (model A1984, FCC ID BCG-E3220A) made a somewhat surprising early appearance in the FCC OET database this morning, since the phone will not be available yet for another month.  Typically, iOS devices have their authorization filings posted right before the devices go up for sale to the public.

Upon examining the certified lab tested RF data and crunching some numbers, what is immediately apparent is that the iPhone XR has -- as expected -- dropped the 4x4 MIMO antenna design from the iPhone XS and XS Max in favor of a standard 2x2 MIMO antenna.  This tradeoff of fewer antennas and MIMO channels, though, ostensibly has allowed for greater antenna gain and, concomitantly, higher radiated output power compared to those same metrics on the iPhone XS and XS Max.

Further analysis may be forthcoming, but for now, the graphs of the iPhone XR EIRP and antenna gain largely can speak for themselves.



For graphs and analysis of iPhone XS and XS Max lab tested figures, see my previous articles (1, 2, 3).

Source: FCC OET

41 comments:

  1. I am thinking may be it is not only 4x4.

    The iPhone X also has problems as compared to iPhone 8. I am think if these has to do with its Stainless Steel casing, which ALL X / Xs series are using.

    ReplyDelete
  2. So, I'm struggling to intrepret the data. It appears to me that the XR would have substantially better functionality than XS in low signal areas using 600 and 700 mhz ( bands 12, 17, 71)?

    Any thoughts on how the XR might compare to the iphone 8+ or Samsung S9 in regards to functionality? I am primarily referring to the ability to make and recieve calls in very low signal areas with some rudimentary web browsing.

    ReplyDelete
    Replies
    1. This is not an answer to anyone’s question just simply trying ask ask a question to this subject. I’ve been looking into this iPhone XR for a couple weeks. I’ve heard different things about the reception (lte). How is it now on 11/20/2018?

      Delete
  3. Could you please explain how to read the graphs?
    Is closer or above to 200mW better?

    ReplyDelete
    Replies
    1. My articles really are not intended for the general public and typical cellphone users, but rather for those who already have reasonable understanding of cellular RF communications. So, I may not always provide basic explanations of my analyses and graphs. That said, yes, uplink maximum EIRP closer to or greater than 200 mW generally is better.

      AJ

      Delete
  4. I purchased the iPhone XR and have been very pleased with the performance in a very rural area. I was able to make calls and maintain an lte connection when several other phones could not even make a call.

    Thanks for making the information more accessible.

    ReplyDelete
  5. I realize this is off-topic, but would you be able to assemble graphs for the Note 9 Snapdragon model?

    ReplyDelete
  6. So if I'm reading this XR graph correctly in 2020, compared to the ones you've done on the XS and XSMax, does this mean that the 2020 class action lawsuit against Apple by XR owners over "poor antenna and reception issues vs XS and XSMax" is doomed to fail, given that the XR with 2x2 MIMO looks better on paper than the "higher end" phones with 4x4 MIMO? Or do I totally not understand what you're showing here? Looking to buy a XR for use mostly in a rural area and news of the lawsuit is giving me pause - don't want to buy a phone if it won't work where I need it to.

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