How to extend PN532 nfc tag reader

Hello everyone,
I am making NFC TAG reader projects. For this projects i am using PN532 nfc reader SPI mode. As per datasheet of PN532 this reader maximum range is around 5 cm. But in my case it's gets around 2 cm. Please help me to find extend range upto 5 cm. What program modification or hardware modification required to get 5 cm reader range.

Datasheet is for the chip. Range depends on antenna. There are PN532 readers with different antenna designs around.

Is there any solution to extend range upto 50 mm, electronically?

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