RFID DETECTION SYSTEM
First Claim
1. An RFID detection system, comprising:
- a detection circuit configured to detect the presence of one or more RFID devices near the RFID detection system, the one or more RFID devices having a resonant frequency, wherein the detection circuit is configured to;
sweep an operating frequency of the detection circuit across a range of frequencies, the range of frequencies including the resonant frequency of the one or more RFID devices, wherein the sweeping is performed at a sweep frequency;
monitor a voltage signal in the detection circuit to determine whether the voltage signal includes a signal component having a frequency of approximately twice the sweep frequency; and
when it is determined that the voltage signal includes a signal component having a frequency of approximately twice the sweep frequency, switch the RFID detection system from a low power mode into an active communication mode.
2 Assignments
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Accused Products
Abstract
Systems and methods for use in detecting the presence of an RFID device are provided. One RFID detection system includes a detection circuit that includes an oscillating circuit. The detection circuit is configured to hold the RFID detection system in a low power mode in which the RFID detection system is configured to not actively attempt to communicate with nearby RFID devices. The detection circuit is further configured to monitor one or more parameters of a signal of the oscillating circuit and compare the one or more monitored parameters to one or more reference parameters. The detection circuit is further configured to, based on the comparison, determine whether to transition the RFID detection system from the low power mode into an active communication mode in which the RFID detection system is configured to actively attempt to communicate with nearby RFID devices.
27 Citations
20 Claims
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1. An RFID detection system, comprising:
a detection circuit configured to detect the presence of one or more RFID devices near the RFID detection system, the one or more RFID devices having a resonant frequency, wherein the detection circuit is configured to; sweep an operating frequency of the detection circuit across a range of frequencies, the range of frequencies including the resonant frequency of the one or more RFID devices, wherein the sweeping is performed at a sweep frequency; monitor a voltage signal in the detection circuit to determine whether the voltage signal includes a signal component having a frequency of approximately twice the sweep frequency; and when it is determined that the voltage signal includes a signal component having a frequency of approximately twice the sweep frequency, switch the RFID detection system from a low power mode into an active communication mode. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method, comprising:
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sweeping an operating frequency of a detection circuit across a range of frequencies, wherein the detection circuit is configured to detect the presence of one or more RFID devices near an RFID detection system, wherein the one or more RFID devices have a resonant frequency, wherein the range of frequencies includes the resonant frequency of the one or more one or more RFID devices, and wherein the sweeping is performed at a sweep frequency; monitoring a voltage signal in the detection circuit to determine whether the voltage signal includes a signal component having a frequency of approximately twice the sweep frequency; and when it is determined that the voltage signal includes a signal component having a frequency of approximately twice the sweep frequency, switching the RFID detection system from a low power mode into an active communication mode. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An RFID detection system, comprising:
a detection circuit configured to detect the presence of one or more RFID devices near the RFID detection system, the one or more RFID devices having a resonant frequency, wherein the detection circuit is configured to; sweep an operating frequency of the detection circuit across a range of frequencies, the range of frequencies including the resonant frequency of the one or more RFID devices, wherein the sweeping is performed at a sweep frequency; identify a component of a voltage signal in the detection circuit having a frequency approximately equal to the sweep frequency; determine an amplitude of the component of the voltage signal having the frequency approximately equal to the sweep frequency; compare the determined amplitude to a reference voltage level; and when the amplitude is greater than the reference voltage level, switch the RFID detection system from a low power mode into an active communication mode. - View Dependent Claims (16, 17, 18, 19, 20)
Specification