NFC antenna separated by coax cable

Question

Hello, 
 Is there a way to connect the remote antenna to the NFC chip (e.g. PTX105R) via a coaxial cable? There is no space for the NFC chip where the antenna is to be mounted and we only have the option of using a coaxial cable for the connection. 
 Since it is essentially a matter of adapting the balanced circuit of the NFC chip to the unbalanced coaxial cable, shouldn't a balun like this one DXW21BN2511N actually be used?

OV_Renesas · Answer

Hi Chris, Apologies for all the delay. There is no need for an expensive coax cable because NFC antenna is not using 50 Ohm impedance. A simple twisted pair cable can be used and the matching procedure is the same as for the standard antenna case. The impedance should be measured on the IC side including the cable and the antenna. Best Regards, OV_Renesas