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Compact Printable Inverted-M Shaped Chipless RFID Tag Using Dual-Polarized Excitation
Open AccessArticle

Four-State Coupled-Line Resonator for Chipless RFID Tags Application

Department of Electrical Engineering, King Saud University, Riyadh 11421, Saudi Arabia
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Electronics 2019, 8(5), 581; https://doi.org/10.3390/electronics8050581
Received: 29 April 2019 / Accepted: 23 May 2019 / Published: 25 May 2019
(This article belongs to the Section Microwave and Wireless Communications)
A novel quad-state coupled-line microstrip resonator is proposed for compact chipless radio frequency identification (RFID) tags. The proposed resonator can be reconfigured to present one of four possible states: 00, 01, 10, and 11, representing, no resonance, resonance at f2, resonance at f1, and resonance at both f1 and f2, respectively. The frequency span between f2 and f1 can be easily controlled, thereby reducing the required spectrum. Moreover, the proposed technique allows the storage of a large amount of data in a compact size to reduce the cost per bit. A multi-resonator prototype consisting of six resonators is designed, analyzed, and experimentally characterized. This prototype is implemented on the RT Duroid 5880 substrate with a dielectric constant of 2.2, loss tangent of 0.0009, and thickness of 0.79 mm. The designed configuration can be reconfigured for 46 codes. Two complete the RFID tags, including the six resonators and two orthogonally polarized transmitting and receiving antennas, are implemented and tested. The first tag code is designed for all ones, 111111111111, and the second tag is designed as 101010101010 code. Experimental results show good agreement with the simulation. View Full-Text
Keywords: chipless RFID; retransmitted based; four-state resonator; ultra wide band (UWB) antenna; internet of things (IoT) chipless RFID; retransmitted based; four-state resonator; ultra wide band (UWB) antenna; internet of things (IoT)
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Abdulkawi, W.M.; Sheta, A.-F.A. Four-State Coupled-Line Resonator for Chipless RFID Tags Application. Electronics 2019, 8, 581.

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