Hardly a new technology currently receives as much attention as the RFID technology. It is to be used in virtually all areas of life. Logistics, security, medical .. Here are some interesting links to circuits

Here you will find Schematic Circuit Diagram for DIY and further information on RFID
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Simple RFID transponders with AM	www.wenzel.com/pdffiles/rays.pdf
LC oscillator to 125kHz Versogung of transponders	www.discovercircuits.com/PDF-FILES/125kpowerosc2.PDF
RFID transponders in a living mouse	instruct1.cit.cornell.edu/courses/eceprojectsland/STUDENTPROJ/2004to2005/dig4/Wireless_Retrieval_of_Mouse_Vital_Signs_via_RFID-dig4.pdf
Coil design for RFID applications	ww1.microchip.com/downloads/en/AppNotes/00678b.pdf