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The aim of this paper is to introduce a novel calibration method for chipless tags. The proposed tag is based on a periodic impedance surface with an asymmetric unit cell geometry. The method relies on a differential encoding of amplitude or phase of the reflected signal. The unit cell of the tag comprises several concentric loops of rectangular shape which exhibits a different response when interrogated...
A periodic surface printed on a grounded dielectric slab is employed as a chipless RFID tag in order to realize a phase-only encoding. The variation of the length of a single loop in the unit cell is addressed to verify the possibility of encoding the information by exploiting the difference between the TE and TM phase response of the tag.
High-Impedance Surfaces comprising multi-resonant elements are proposed as chipless tags. The presence of the ground plane in the structure is a key point in realizing a chipless RFID nearly insensitive with respect to the objects which the tags are placed on. The paper presents various encoding mechanisms used to design robust and compact chipless RFID tags able to work both on low-reflecting objects...
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