Methods and Apparatus For Self-Jamming Suppression In A Radio Frequency Identification (RFID) Reader
First Claim
1. A method for suppressing a jamming signal coupled from a transmitter of a Radio Frequency Identification (RFID) reader to a receiver of the RFID reader, the method comprising:
- measuring a power level of the jamming signal in a receive path of the RFID reader, the RFID reader being in communication with a directional coupler;
retrieving, by a processor, one or more parameters corresponding to the measured power level, the one or more parameters being substantially optimized to reduce the measured power level of the jamming signal; and
changing, by the processor responsive to the one or more parameters, an impedance of a circuit in communication with the directional coupler.
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Abstract
A circuit for transmitter-receiver isolation that is useful in a monostatic (combined transmitting and receiving) antenna configuration is shown and described. In addition, methods and systems are shown for automatically adjusting the circuit in response to changes in antenna configuration, external signal reflectors, and jamming energy (e.g., self jammer energy) by adjusting the circuit to tune out these sources of jammer energy to yield an increase in RFID reader receiver sensitivity when compared to measurements of the receiver sensitivity when the jammer energy is not present.
54 Citations
21 Claims
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1. A method for suppressing a jamming signal coupled from a transmitter of a Radio Frequency Identification (RFID) reader to a receiver of the RFID reader, the method comprising:
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measuring a power level of the jamming signal in a receive path of the RFID reader, the RFID reader being in communication with a directional coupler; retrieving, by a processor, one or more parameters corresponding to the measured power level, the one or more parameters being substantially optimized to reduce the measured power level of the jamming signal; and changing, by the processor responsive to the one or more parameters, an impedance of a circuit in communication with the directional coupler. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system for suppressing jamming signal coupled from a transmitter of a Radio Frequency Identification (RFID) reader to a receiver of the RFD reader, the system comprising:
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a processor in communication with a receive path modulator of the RFID reader, the processor receiving a power measurement from the receive path modulator and executing instructions to retrieve one or more parameters corresponding to the measured power; a controllable impedance circuit, in communication with the processor, receiving and responding to a command based on the retrieved parameters from the processor to adjust one or more attributes of the controllable impedance circuit; and a directional coupler in communication with the controllable impedance circuit, the directional coupler having a performance parameter that changes responsive to a change in the one or more attributes of the controllable impedance circuit. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21)
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Specification