Improving contactless technology by increase of transponder load modulation with serial capacitor

Abstract

Proven chip technology based on International Standards can be used to implement person-related, secure contactless technology also into objects defining smaller antenna sizes than cards. Provided that sufficient power for chip operation is available, low transponder load modulation is the most limiting factor for the communication distance. A simple capacitance matching network allows to balance between power requirements and load modulation amplitude, so that compliance to the requirements of the Standard and to existing terminal infrastructure can be achieved.