Millimetre-wave image-based chipless RFID system
AssigneeMonash University
InventorsNemai Chandra Karmakar, Mohammad Zomorrodi
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Abstract
A mm-wave RFID tag interrogation apparatus includes multiple transmitting antennas, and multiple receiving antennas. The transmitting and receiving antennas are spatially distributed and oriented in orthogonal polarization states. A transmitter is coupled to the transmitting antennas, and transmits a corresponding multiple number of separable mm-wave signals. A receiver coupled to the receiving antennas is configured to extract separable components of received mm-wave signals. A processing unit processes the extracted signal components using a synthetic aperture algorithm. An RFID tag, readable by the interrogation apparatus, includes meander-line conductive elements arranged to encode information spatially on a substrate.
Claims11
A mm-wave RFID tag interrogation apparatus comprising:
- a plurality (P) of transmitting antennas having a first spatial distribution and each arranged to transmit mm-wave radiation having a first state of polarisation;
- a plurality (Q) of receiving antennas having a second spatial distribution and each arranged to receive mm-wave radiation having a second state of polarisation which is substantially orthogonal to the first state of polarisation;
- at least one transmitter coupled to the transmitting antennas and configured to transmit a corresponding plurality of separable mm-wave signals;
- at least one receiver coupled to the receiving antennas and configured to extract separable signal components of corresponding mm-wave signals received via each one of the receiving antennas;
- and
- a processing unit arranged to receive and process the extracted signal components using a synthetic aperture algorithm so as to locate one or more spatially distributed remote cross-polarising reflecting elements;
- wherein the apparatus utilizes a multiple-input multiple-output (MIMO) combination between the plurality of transmitting antennas and the plurality of receiving antennas, and wherein the synthetic aperture algorithm and MIMO combination emulate a larger aperture size than an actual aperture size of the plurality of transmitting antennas and the plurality of receiving antennas.
A method of mm-wave RFID tag interrogation comprising:
- transmitting, via a plurality (P) of transmitting antennas having a first spatial distribution, a corresponding plurality of separable mm-wave signals;
- receiving, via a plurality (Q) of receiving antennas having a second spatial distribution, a corresponding plurality of received mm-wave signals;
- processing the received millimeter wave signals to extract separable signal components of each received mm-wave signal;
- and
- further processing the extracted signal components using a synthetic aperture algorithm so as to locate one or more spatially distributed remote cross-polarising reflective elements;
- wherein the apparatus utilizes a multiple-input multiple-output (MIMO) combination between the plurality of transmitting antennas and the plurality of receiving antennas, and wherein the synthetic aperture algorithm and MIMO combination emulate a larger aperture size than an actual aperture size of the plurality of transmitting antennas and the plurality of receiving antennas.
Dependencies are inferred from the claim text.