DYNAMIC ANTENNA TUNING CIRCUIT FOR A RADIO FREQUENCY IDENTIFICATION READER
First Claim
1. A tunable resonant circuit for a radio frequency identification (RFID) reader, wherein the reader transmits an activation signal to a transponder during a transmit interval and receives a transponder reply during a receive interval, the tunable resonant circuit comprising:
- at least one resonant frequency-determining element;
a switched dynamic tuning network associated with the resonant frequency-determining element;
a switching circuit responsive to a switching signal for tuning the resonant circuit to a first resonant frequency value during the transmit interval and to a second resonant frequency value during the receive interval.
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Accused Products
Abstract
A resonant antenna circuit for a radio frequency identification (RFID) reader generates an electrical signal for activating a passive identification tag. The identification tag in turn generates a coded electrical signal that is detected by the reader. The electrical characteristics of the resonant circuit are actively and dynamically altered so that the antenna performs more optimally during the transmit and receive intervals.
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Citations
11 Claims
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1. A tunable resonant circuit for a radio frequency identification (RFID) reader, wherein the reader transmits an activation signal to a transponder during a transmit interval and receives a transponder reply during a receive interval, the tunable resonant circuit comprising:
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at least one resonant frequency-determining element; a switched dynamic tuning network associated with the resonant frequency-determining element; a switching circuit responsive to a switching signal for tuning the resonant circuit to a first resonant frequency value during the transmit interval and to a second resonant frequency value during the receive interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification