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What is the square pattern on OM25180FDK?

Question asked by Naoki Matsuda on Apr 14, 2017

I have bought a NFC EVK(OM25180FDK) and found that the antenna board has many square Cu patterns. What are these patterns? I want to evaluate the board with a touch sensor, but these patterns interrupt it. Is this a part of antenna design or the pattern simply for length measurement?