RFID TAG HAVING PARALLEL RESONANT CIRCUIT FOR MAGNETICALLY DECOUPLING TAG FROM ITS ENVIRONMENT

摘要

An RFID tag circuit provides magnetic decoupling and amplitude modulation. T he circuit is made up of a first inductor and a second inductor connected in series, a first capacitor, a second capacitor, and a switch. The circuit includes a first resonant circuit formed from a parallel connection of the series connected first and second inductors, an d the first capacitor. The first resonant circuit has a primary resonant frequency. The circuit also includes a second circuit formed from a series connection of the second capacitor and the switch. The series connection of the second capacitor and the switch are connected in parallel to the second inductor. One end of the series connected second capacitor and switch is connected to the common connection between th e series connected first and second inductors.