‘Δ’ slotted compact printable orientation insensitive chipless RFID tag for long range applications

A novel design concept of a compact printable chipless RFID tag is presented. The tag consists of a triangular patch loaded with multiple triangular `Δ' shaped slot resonators. Six copies of the identical patches are placed together to achieve a very compact long range chipless RFID tag. This symmetric frequency domain based tag has the advantage to be read from any orientation with the reader antennas. The tag can be read by chipless RFID tag reader in both near field and far-field measurements. This tag does not have a ground plane and has higher data density compared to most of the existing printable chipless tags.