TUNING AN RFID READER WITH ELECTRONIC SWITCHES

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-tun...

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Bibliographische Detailangaben
1. Verfasser: QUAN, RALPH W
Format: Patent
Sprache:eng ; fre
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Beschreibung
Zusammenfassung: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-tunin g capacitor switch is in the open position.