Sharing some information to you guys about mmWave antenna. There are three mmWave antenna in iPhone 12 series. One is on right hand side under the power key with antenna open window, the second is on the back side which mount on mother board, the last one is on front side which is above receiver. As you can see one unknown part above receiver with four small squares pattern and connect to mother board. That is the third mmWave antenna module.
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