Millimetre-Wave Image-Based Chipless RFID System

摘要

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 polarisation 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.

主权项

1. 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.