Radio frequency data communications device
First Claim
Patent Images
1. A radio frequency communications device comprising:
- a transmitter and a receiver, the transmitter selectively transmitting a signal using a modulation scheme to an interrogator in response to receiving an interrogation request from the interrogator using a modulation scheme, the transmitter being capable of transmitting using at least three different modulation schemes selected from the group consisting of Frequency Shift Keying (FSK), Binary Phase Shift Keying (BPSK), On-Off Keying (OOK), and Amplitude Modulation (AM), and being switchable to select one of the modulation schemes, wherein, for the selected modulation scheme, a carrier for the transmitter is generated by the integrated circuit itself, in an active mode, the integrated circuit further being switchable to transmit in a modulated backscatter mode in which the integrated circuit uses a carrier transmitter by the interrogator, wherein the transmitter is configured to switch between the active mode and the backscatter mode in response to a radio frequency (RF) command.
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Abstract
A radio frequency identification device includes an integrated circuit including a receiver, a transmitter, and a microprocessor. The receiver and transmitter together define an active transponder. The integrated circuit is preferably a monolithic single die integrated circuit including the receiver, the transmitter, and the microprocessor. Because the device includes an active transponder, instead of a transponder which relies on magnetic coupling for power, the device has a much greater range.
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Citations
22 Claims
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1. A radio frequency communications device comprising:
a transmitter and a receiver, the transmitter selectively transmitting a signal using a modulation scheme to an interrogator in response to receiving an interrogation request from the interrogator using a modulation scheme, the transmitter being capable of transmitting using at least three different modulation schemes selected from the group consisting of Frequency Shift Keying (FSK), Binary Phase Shift Keying (BPSK), On-Off Keying (OOK), and Amplitude Modulation (AM), and being switchable to select one of the modulation schemes, wherein, for the selected modulation scheme, a carrier for the transmitter is generated by the integrated circuit itself, in an active mode, the integrated circuit further being switchable to transmit in a modulated backscatter mode in which the integrated circuit uses a carrier transmitter by the interrogator, wherein the transmitter is configured to switch between the active mode and the backscatter mode in response to a radio frequency (RF) command. - View Dependent Claims (2)
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3. A radio frequency communications device comprising:
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a dipole antenna having first and second portions which define, in operation, first and second poles of the dipole antenna, respectively; and
an integrated circuit coupled to the antenna and including a transmitter and a receiver, the transmitter selectively transmitting a signal using a modulation scheme, the transmitter being capable of transmitting using modulated backscatter modulation and also capable of transmitting using at least three active modes selected from the group consisting of;
Frequency Shift Keying (FSK), Binary Phase Shift Keying (BPSK), On-Off Keying (OOK), and Amplitude Modulation (AM);
the transmitter being switchable between active modes, the transmitter further being switchable between backscatter and active modes in response to a radio frequency command received by the receiver, wherein in the backscatter mode the integrated circuit alternately reflects or does not reflect the carrier from the interrogator by shorting or isolating the first and second portions of the dipole antenna to transmit data to the interrogator. - View Dependent Claims (4)
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5. A radio frequency communications device comprising:
an integrated circuit including a transmitter and a receiver, the transmitter selectively transmitting a signal using a modulation scheme to an interrogator in response to receiving an interrogation request using a modulation scheme, the transmitter being capable of transmitting using at least three modulation schemes selected from the group consisting of Binary Phase Shift Keying (BPSK), Direct Sequence Spread Spectrum, On-Off Keying (OOK), and Amplitude Modulation (AM), and being switchable to select between modulation schemes, wherein, for the selected modulation scheme, a carrier for the transmitter is generated by the integrated circuit itself, in an active mode, the integrated circuit further being switchable to transmit in a modulated backscatter mode in which the integrated circuit uses a carrier transmitter by the interrogator, wherein the transmitter is configured to switch between the active mode and the backscatter mode in response to a radio frequency (RF) command. - View Dependent Claims (6)
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7. A radio frequency communications device comprising:
an integrated circuit including a transmitter and a receiver, the transmitter selectively transmitting a signal using a modulation scheme to an interrogator in response to receiving an interrogation request from the interrogator using a modulation scheme, the transmitter being capable of transmitting using at least three modulation schemes selected from the group consisting of Frequency Shift Keying (FSK), Direct Sequence Spread Spectrum, On-Off Keying (OOK), and Amplitude Modulation (AM), and being switchable to select between modulation schemes, wherein, for the selected modulation scheme, a carrier for the transmitter is generated by the integrated circuit itself, in an active mode, the integrated circuit further being switchable to transmit in a modulated backscatter mode in which the integrated circuit uses a carrier transmitter by the interrogator, wherein the transmitter is configured to switch between the active mode and the backscatter mode in response to a signal from the interrogator.
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8. A radio frequency communications device in accordance with claimed 7 and further comprising a dipole antenna having first and second portions which define, in operation, first and second poles of the dipole antenna, respectively;
- wherein the transmitter is switchable between backscatter and active modes in response to a radio frequency command received by the receiver, wherein in the backscatter mode the integrated circuit alternately reflects or does not reflect the carrier from the interrogator by shorting or isolating the first and second portions of the dipole antenna to transmit data to the interrogator.
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9. A radio frequency communications device comprising:
an integrated circuit including a transmitter and a receiver, the transmitter selectively transmitting a signal to an interrogator using a modulation scheme, the transmitter being capable of transmitting using at least three modulation schemes selected from the group consisting of Frequency Shift Keying (FSK), Binary Phase Shift Keying (BPSK), Direct Sequence Spread Spectrum, and Amplitude Modulation (AM), and being switchable to select between modulation schemes, wherein, for the selected modulation scheme, a carrier for the transmitter is generated by the integrated circuit itself, in an active transmission mode, the integrated circuit further being switchable to transmit in a modulated backscatter mode in which the integrated circuit uses a carrier transmitter by the interrogator, wherein the transmitter is configured to selectively switch between the active and backscatter modes in response to a signal from the interrogator. - View Dependent Claims (10)
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11. A radio frequency communications device comprising:
an integrated circuit including a transmitter and a receiver, the transmitter selectively transmitting a signal to an interrogator using a modulation scheme in response to receiving a request from the interrogator, the transmitter being capable of transmitting using at least three modulation schemes selected from the group consisting of Frequency Shift Keying (FSK), Binary Phase Shift Keying (BPSK), Direct Sequence Spread Spectrum, and On-Off Keying (OOK), and being switchable to select between modulation schemes, wherein, for the selected modulation scheme, a carrier for the transmitter is generated by the integrated circuit itself, in an active mode, the integrated circuit further being switchable to transmit in a modulated backscatter mode in which the integrated circuit uses a carrier transmitter by the interrogator, wherein the transmitter is configured to switch between the active and backscatter modes in response to a command from the interrogator. - View Dependent Claims (12)
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13. A radio frequency communications device comprising:
an integrated circuit including a transmitter and a receiver, the transmitter selectively transmitting a signal to an interrogator using a modulation scheme upon receiving an interrogation signal from the interrogator, the transmitter being capable of selectively transmitting using a modulation scheme among a plurality of modulation schemes wherein, for the selected modulation scheme, a carrier for the transmitter is generated by the integrated circuit itself, instead of by the interrogator thereby rendering operation of the transmitter in an active mode, the integrated circuit further being switchable to transmit in a modulated backscatter mode in which the integrated circuit uses a carrier transmitted by the interrogator, wherein the modulation scheme is selectable by the interrogator, and the transmitter is configured to switch between the active mode and the backscatter mode in response to RF commands sent from the interrogator, and further wherein transmit frequency for the transmitter is recovered from a message received in the receiver via RF commands from the interrogator. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
Specification