Antenna design for RFID reader

Hi,
I m designing a 125Khz RFID reader and antenna.Can someone help me out with antenna design and its calculation of no of turns of coil,also m using PIC16f877a for this,so how to demodulate the modulation signal through PIC.



Kindly reply urgent.

Microchip and TI have tutorials on RFID antennas. Just take a look at them. If you still find problems you can post them on the forum.