Abstract
This communication aims to demonstrate both theoretically and experimentally that chipless tags can be efficiently detected on metallic platforms by exploiting cross-polar reflection. The employed tag consists of a frequency selective surface (FSS) comprising concentric square loop resonators printed on a grounded dielectric slab. The co-polar reflection amplitude of the proposed structure is characterized by deep minima in correspondence of every resonance, whereas the cross-polar component of the reflection coefficient exhibits well defined frequency selective maxima. Since each resonance is determined by a specific concentric loop, the presence or the absence of a loop is used to apply an amplitude modulation on the reflected signal. Measurements on realized prototypes are also provided to assess the effectiveness of the proposed technique.
Published Version
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