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NFC HF ISO 14443 antenna/Reader for Samsung

Hey ! 

We are students and we are trying to integrate nfc in our new logging app for Iphone and Android. We need to extend reader range of the antenna in the phone by 20-50 cm. 

We have looked at different types of readers and antennas. Talked to vendors/sellers in Netherland and China without a good answer.  

Is there any smart minds that can provide us a good setup for this. Have looked at 2 differnt outcomes. One where we need to rebuild the phone and one where we apply an sticker extender. 

Anyone have a good ide for this ? 

Thanks From Norway