Why did apple switch to a different design other than the outer band dual antenna design in the iphone5 ?

This is a subject i'm not to familiar with but i do know a little about antenna design.
I was wondering what caused apple to switch to a different design (did they?). What research caused this change ?
Thanks,
David
ps: was also wondering what the difference in signal stregnth was between the two designs ?
thanks again!

<http://www.macrumors.com/2012/09/12/the-iphone-5-should-again-deliver-an-improve d-antenna/>

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