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D. Hamzaoui

Bio: D. Hamzaoui is an academic researcher. The author has contributed to research in topics: Antenna measurement & Dipole antenna. The author has an hindex of 2, co-authored 2 publications receiving 11 citations.

Papers
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Proceedings ArticleDOI
19 Jul 2015
TL;DR: In this paper, a novel high gain metamaterial tag antenna for European UHF RFID was proposed, where a modified dog bone AMC unit cell and a meander dipole antenna are designed separately to operate in 865.6-867.6 MHz frequency band, then the effect of adding an AMC to design is investigated.
Abstract: A novel high gain metamaterial tag antenna for European UHF RFID is proposed. First a modified dog bone AMC unit cell and a meander dipole antenna are designed separately to operate in 865.6–867.6 MHz frequency band, then the effect of adding an AMC to design is investigated. The realized gain increased from 1.8 dB for the antenna alone to 4.17 dB for the metamaterial antenna constituted of 1 × 2 unit cells. A total efficiency of 90 % is observed at 868 MHz. Then the effect of increasing the number of unit cells of AMC on the performance of the tag antenna in terms of gain, bandwidth and radiation efficiency is studied. By increasing the unit cells to 2×3, the antenna gain increases to 7.66 dB with an efficiency of 95.78 %, hence increasing the read range. The structure is low cost and easy to fabricate.

8 citations

Proceedings ArticleDOI
13 Jul 2014
TL;DR: In this article, a Fabry-Perot cavity antenna for UHF RFID application is presented, where a circularly polarized antenna is designed to obtain a high gain of 9.82 dB at 868 MHz.
Abstract: A Fabry-Perot cavity antenna for UHF RFID application is presented. First, a circularly polarized antenna is designed to obtain a high gain of 9.82 dB at 868 MHz. Then a hexagonal patch type frequency selective surface is designed and placed above the primary antenna to be used as partially reflective surface (PRS) to enhance its gain. The overall dimension of the structure is about (1.73 λ 0 * 1.5 λ 0 * 0.53 λ 0 ), where λ 0 is the free-space operating wavelength. The simulation results yield a 13.12 dB realized gain, 1.61 % 3 dB gain bandwidth and an axial ratio less than 3 dB with a ±33° beamwidth at 868 MHz. The cavity reflex antenna exhibits a good efficiency of 96.13% and side lobe level (SLL) less than -14 dB.

3 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, a long-range passive RFID and distributed sensing system using a single wire transmission line (SWTL) as the communication channel is presented. But the authors do not consider the performance of the SWTL-based RFID system.
Abstract: We present a long-range passive (battery-free) radio frequency identification (RFID) and distributed sensing system using a single wire transmission line (SWTL) as the communication channel. A SWTL exploits guided surface wave propagation along a single conductor, which can be formed from existing infrastructure, such as power lines, pipes, or steel cables. Guided propagation along a SWTL has far lower losses than a comparable over-the-air (OTA) communication link; so much longer read distances can be achieved compared with the conventional OTA RFID system. In a laboratory-scale experiment with an ISO18000–6C (EPC Gen 2) passive tag, we demonstrate an RFID system using an 8 mm diameter, 5.2 m long SWTL. This SWTL has 30 dB lower propagation loss than a standard OTA RFID system at the same read range. We further demonstrate that the SWTL can tolerate extreme temperatures far beyond the capabilities of coaxial cable, by heating an operating SWTL conductor with a propane torch having a temperature of nearly 2000 °C. Extrapolation from the measured results suggest that a SWTL-based RFID system is capable of read ranges of over 70 m assuming a reader output power of +32.5 dBm and a tag power-up threshold of −7 dBm.

18 citations

Journal ArticleDOI
TL;DR: This letter provides a miniature antenna for the RFID tag for identifying patients in African and European hospitals and shows good performance in terms of miniaturization, bandwidth, impedance matching and, reading distance.
Abstract: The development of miniature antennas for bio-medical applications has attracted the attention of many researchers in the last years. In this letter, we provide a miniature antenna for the RFID tag for identifying patients in African and European hospitals. The proposed antenna is designed on a flexible silicon substrate with a relative dielectric constant of 11.9 and a thickness of 1.6mm. An in-depth study of the proposed wearable antenna was made in free space and on human tissue. The achieved results showed good performance in terms of miniaturization, bandwidth, impedance matching and, reading distance. The presented tag antenna is designed and simulated by using CST-MWS solver and the results were validated by HFSS and both results are in good agreement.

13 citations

Journal ArticleDOI
TL;DR: Simulation results have confirmed that proposed Miller encoder offers a simpler design with reduced transistor count and gives lower power dissipation, higher frequency range of operation at lower supply rail as compared to other candidate designs.
Abstract: This paper proposes a T-flip-flop and a Miller encoder design for ultra-high frequency and super high frequency, radio-frequency identification (RFID) application using FinFETs. Miller encoder is u...

8 citations