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A low-profile and meandered crossed dipole antenna design for ultrahigh-frequency (UHF) radio-frequency identification (RFID) circularly polarized (CP) tag or handheld reader application is described in this communication. The crossed dipole CP condition is obtained by employing a series power di...
Read MoreReducing collisions in UHF RFID systems is a crucial problem. In most anti-collision designs, the reader has to estimate the number of tags within its reading range during the interrogation process. Most of the approaches estimate the number of tags with observations in multiple time slots. Since...
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In this paper, the mechanical displacement and the resulting resonance shift of a basic double split ring resonator (DSRR) which is placed in different low-loss liquid-phase environments are experimentally demonstrated. Such resulting dynamic process is due to the wave-DSRR interactions and the i...
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Distance bounding (DB) protocols are crucial solutions against “distance attacks.” Traditional one-hop DB protocols can estimate an upper-bound of the physical distance between two nodes within their communication range, but they fail when this distance exceeds their coverage. Recently, a two-h...
Read MoreIn this communication, a compact and broadband coplanar waveguide-fed meandered-slot antenna is presented. Compact size of 0.3 × 0.2 λ 2 (30 × 20 mm 2 on a 1.6 mm thick FR4 dielectric substrate) is achieved by employing a modified meandered slot, a slotted Y-shaped monopole, and a trident-shaped...
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