Auto-tuned RFID reader antenna

Details Auto-tuned RFID reader antenna Auto-tuned RFID reader antenna

2006-03-22

2008-10-21

Tweel, Jr., John A (Department: 2612)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S572500

Reexamination Certificate

active

07439860

ABSTRACT:
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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patent: 2005/0285718 (2005-12-01), Enguent
patent: 2007/0171065 (2007-07-01), Ku et al.

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