Passive RFID Transponders Based on SRR and Koch-island Fractal for Bit-Coding Enhancement

To date, Chipless Radio Frequency Identification (RFID) has become one of the prominent methods for identifying and detecting objects. The advantage of tagging technology over optical barcodes is that it does not rely on line-of-sight communication. In this paper, the design, simulation, and fabrication of chipless RFID transponders, based on the square Split-Ring Resonators (SRR) and the Koch-island fractal of the third iteration are analyzed. The Radar Cross Section (RCS) and frequency coding techniques are investigated along with a comparison, showing the vital features like physical footprint and spatial density etc. of the transponders. It leads to the cost reduction in tag manufacturing which is suitable for mass industrial production. The maximum RCS are found to be −20.90 dBsm and −25.6 dBsm for transponders 1 and 2 respectively. The spatial densities are found to be 0.125 bits/mm
²
for tag 1 and 0.041 bits/mm
²
for tag 2.