Using an active RFID tag with a passive reader - range extending

I have been looking at the PN532 passive tag reader.

It works fine except the range is very short (less than 10mm).

It is a 13.56mhz device.

I was wondering if anyone had tried to extend the aerial range or tried to interface an active tag with one?

Is this in the right section ? anyway, from the brochure

Typical operating distance in ISO/IEC 14443A/MIFARE or FeliCa card emulation mode
of approximately 100 mm depending on antenna size, tuning and external field
strength

Yes, That's what the brochure says but this module (532) and the 522 just don't have that range I have tried them both. They limit at around 10mm....

I was hoping I could find a powered tag that was compatible.