Auto-tuned rfid reader antenna

Details Auto-tuned rfid reader antenna Auto-tuned rfid reader antenna

H - Electricity

01

Q

H01Q 23/00 (2006.01) G01V 3/12 (2006.01) H02J 17/00 (2006.01) H03J 3/02 (2006.01) G06K 19/07 (2006.01)

Patent

CA 2581553

A reader for an RFID system includes an antenna assembly, a signal driver and a controller. The antenna assembly has an antenna coupled to an antenna tuning circuit which includes a variable capacitance circuit. The signal driver is coupled to the antenna assembly to apply a drive signal to the antenna assembly. The controller is coupled to the antenna assembly to determine a difference between an antenna impedance and a signal driver impedance and to set the variable capacitance at a set capacitance value which reduces the impedance difference.

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