Tuning an rfid reader with electronic switches

Details Tuning an rfid reader with electronic switches Tuning an rfid reader with electronic switches

G - Physics

01

V

G01V 3/08 (2006.01) G01V 3/12 (2006.01)

Patent

CA 2606893

A reader for an RFID system includes a signal driver for generating an excitation signal and a resonant circuit having an adjustable resonant circuit capacitance for retuning the resonant circuit in response to detuning. The resonant circuit has a capacitance tuning circuit which includes a fine-tuning capacitor having a fine-tuning capacitance and a fine-tuning capacitor switch having an open position and a closed position. The fine-tuning capacitance is added to the adjustable resonant circuit capacitance when the fine-tuning capacitor switch is in the closed position and is removed from the adjustable resonant circuit capacitance when the fine-tuning capacitor switch is in the open position.

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