In this paper, we present a novel fully printable chipless
RFID system based on multiresonators and cross-polarized
ultra-wideband (UWB) monopole antennas where the tag’s
unique ID is encoded as a spectral signature. We have reported
preliminary results on our system, but only focusing on the
proof of concept [13]. The main differences between our
system and the ones reported in [7], [8], and [13] are that we
encode data in both amplitude and phase, show the possibility
of designing a UWB chipless tag, and that the system is not
based on radar cross section (RCS) backscattering, but on
retransmission of the interrogation signal with the encoded
unique spectral ID. The received and transmitted signals are
cross-polarized in order to achieve good isolation between the
two. Due to these differences, we believe to have achieved less
mutual coupling effects, greater number of possible bits, and
easier encoding than reported in [7] and [8].
This paper is organized as follows. Section II presents the
basic theory of the chipless RFID system. Section III deals with
the design of the chipless RFID transponder and the reader antennas.
The simulated and measured results of the chipless RFID
system are presented in Section IV followed by a conclusion in
Section V.