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Open AccessArticle

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

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Department of Electrical Engineering, King Saud University, Riyadh 11421, Saudi Arabia
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KACST-TIC in Radio Frequency and Photonics for the e-Society (RFTONICS), Electrical Engineering Department, King Saud University, Riyadh 11421, Saudi Arabia
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Author to whom correspondence should be addressed.
Electronics 2019, 8(5), 580; https://doi.org/10.3390/electronics8050580
Received: 24 April 2019 / Revised: 18 May 2019 / Accepted: 22 May 2019 / Published: 25 May 2019
(This article belongs to the Special Issue Advanced RFID Technology and Applications)
A novel and compact dual-polarized (DP) chipless radio-frequency identification (RFID) tag is presented in this paper. This tag can read both vertical and horizontal orientations within its frequency band, which improves the robustness and detection capability of the RFID system. The proposed tag makes use of the slot length variation encoding technique to improve the encoding capacity. This technique can duplicate the encoding capacity, thereby reducing the overall tag size by almost 50%. In particular, the proposed tag has an encoding capacity of 20 bits in the 3–8 GHz frequency band and achieves data density of around 15.15 bits/cm2. Three prototypes are fabricated and tested outside an anechoic chamber. Furthermore, one tag is tested at different distances (10 cm, 30 cm, and 60 cm) from the reader and the measured results are compared. The simulated and measured results are in reasonable agreement, with acceptable shifts at some frequencies due to fabrication and experimental errors. View Full-Text
Keywords: chipless RFID; frequency selective surfaces (FSSs); dual-polarized; length variation; internet of things (IoT) chipless RFID; frequency selective surfaces (FSSs); dual-polarized; length variation; internet of things (IoT)
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Abdulkawi, W.M.; Sheta, A.-F.A.; Issa, K.; Alshebeili, S.A. Compact Printable Inverted-M Shaped Chipless RFID Tag Using Dual-Polarized Excitation. Electronics 2019, 8, 580.

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