Near field RFID system with multiple reader coils
First Claim
1. An apparatus, comprising:
- a first near field device including;
an encoding section for encoding data thereby generating encoded data;
a digital to analog conversion module for processing the encoded data thereby generating an analog encoded signal;
a plurality of coils for;
producing a first electromagnetic field in accordance with transmitting the analog encoded signal; and
producing a second electromagnetic field in accordance with receiving a response signal from a second near field device;
a response signal section for processing the response signal corresponding to the second electromagnetic field; and
a transmit blocking circuit for blocking energy of the first electromagnetic field associated with the analog encoded signal from interfering with the processing of the response signal.
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Accused Products
Abstract
A near field RFID system includes an RFID reader and an RFID tag. The RFID reader includes a transmit path and a receive path, wherein the transmit path includes: an encoding section coupled to convert data into encoded data; a digital to analog conversion module coupled to convert the encoded data into an analog encoded signal; a power amplifier coupled to amplify the analog encoded signal; and a plurality of coils coupled to generate a plurality of electromagnetic fields from the analog encoded signal. The RFID tag that includes: a coil coupled to generate a current and a recovered signal from at least one of the plurality of electromagnetic fields; a power recovery circuit coupled to generate a voltage from the current; and a data processing section coupled to process the recovered signal, wherein the data processing section is powered via the voltage.
25 Citations
20 Claims
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1. An apparatus, comprising:
a first near field device including; an encoding section for encoding data thereby generating encoded data; a digital to analog conversion module for processing the encoded data thereby generating an analog encoded signal; a plurality of coils for; producing a first electromagnetic field in accordance with transmitting the analog encoded signal; and producing a second electromagnetic field in accordance with receiving a response signal from a second near field device; a response signal section for processing the response signal corresponding to the second electromagnetic field; and a transmit blocking circuit for blocking energy of the first electromagnetic field associated with the analog encoded signal from interfering with the processing of the response signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus, comprising:
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a first near field device including; an encoding section for encoding data thereby generating encoded data; a digital to analog conversion module for processing the encoded data thereby generating an analog encoded signal; a plurality of coils for; producing a first electromagnetic field in accordance with transmitting the analog encoded signal; and producing a second electromagnetic field in accordance with receiving a response signal; a response signal section for processing the response signal corresponding to the second electromagnetic field; and a transmit blocking circuit for blocking energy of the first electromagnetic field associated with the analog encoded signal from interfering with the processing of the response signal; and a second near field device including; a coil for producing a third electromagnetic field in accordance with receiving the analog encoded signal and for providing a recovered signal there from; a data processing section for processing the recovered signal thereby generating the response signal; and
wherein;the coil producing a fourth electromagnetic field in accordance with transmitting the response signal to the first near field device. - View Dependent Claims (13, 14, 15, 16)
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17. A method for operating a near field device, the method comprising:
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encoding data thereby generating encoded data; processing the encoded data in accordance with digital to analog conversion thereby generating an analog encoded signal; operating a plurality of coils for; producing a first electromagnetic field in accordance with transmitting the analog encoded signal; and producing a second electromagnetic field in accordance with receiving a response signal from at least one additional near field device; processing the response signal corresponding to the second electromagnetic field; and blocking energy of the first electromagnetic field associated with the analog encoded signal from interfering with the processing of the response signal. - View Dependent Claims (18, 19, 20)
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Specification