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In this paper, we present the characterization of the reading volume for a chipless RFID system. S21-parameter measurements were done in real environment with a fixed antenna and moving tag inside a 30×30×30 cm 3 volume, the result obtained is the reading zone for the given setup. A qualitative analysis is done, pointing out its resemblance to the radiation pattern of the antenna and the implications on the tag's readability in a 3-dimensional range. In this study, we have shown that the maximum reading distance could be as high as 30 cm, and that the largest reading area is approximately 300 cm 2 with a read success rate of 40% inside that area, for a distance of 15 cm.

A comparison of four decoding methods for a Chipless RFID system was executed by analyzing the read success rate of a frequency-position coding tag with 12-bit of capacity. Scattering parameter measurements have been performed in a real environment, using a fixed antenna, with the tag moving within a 30×30×30 cm 3 volume. Optimal parameters have been obtained based on the decoding success rates of the practical measurements, for background calibration, time-gating, Short Time Fourier Transform (STFT) and Short Time Prony Analysis (STPA) methods. STFT and time-gating showed the best volume reading performance. Time-gating has been found to be the best decoding method for the chipless RFID system employed, as it presented the best performance amongst the other methods while being a less complex, 1-D, approach.

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