A5054927640- Antenna Design and Analysis
- Metamaterials and Metasurfaces Applications
- Advanced Antenna and Metasurface Technologies
- Energy Harvesting in Wireless Networks
- Microwave Engineering and Waveguides
- Terahertz technology and applications
- Millimeter-Wave Propagation and Modeling
- Superconducting and THz Device Technology
- Advanced MIMO Systems Optimization
- Plasmonic and Surface Plasmon Research
- Electromagnetic Scattering and Analysis
- Photonic and Optical Devices
- Neural Networks and Reservoir Computing
- Intracranial Aneurysms: Treatment and Complications
- Full-Duplex Wireless Communications
- solar cell performance optimization
- Advanced Memory and Neural Computing
- Traumatic Brain Injury and Neurovascular Disturbances
- Cerebrovascular and Carotid Artery Diseases
- RFID technology advancements
University of Jeddah
2016-2024
National Engineering School of Tunis
2017-2024
Tunis El Manar University
2016-2024
King Abdulaziz University
2016-2023
Centre Hospitalier Universitaire Hassan II
2020
We introduce a practical dielectric metasurface design for microwave frequencies. The is made of an array resonators held together by connections thus avoiding the need mechanical support in form slab and spurious multiple reflections that such would generate. proposed can be used either broadband applications or monochromatic wave transformations. capabilities concept to manipulate transmission phase amplitude are supported numerical experimental results. Finally, half-wave plate...
This study proposed, for the first time, a newly developed metal–insulator-insulator–metal (MIIM)-based log-spiral rectenna energy harvesting applications. The designed resonant antenna at 28.3 THz forwards absorbed infrared (IR) electromagnetic (EM) radiations to installed double insulator-based MIIM rectifying diode. realized diode is formed by sandwiching two insulators among terminals (hot spot region). Antenna are used as electrodes of novel approach ensures maximum transfer captured IR...
We present the design of a new microwave all-dielectric chiral metasurface with circular dichroism behavior based on elliptic dielectric resonators (EDRs). During procedure, we have first optimized numerically effects main parameters such as resonator’s size and orientation, well slot within them, transmission over frequency band 10–20 GHz. Measurements final prototype shown large (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"...
This work presents the design and analysis of a metal-insulator-metal (MIM)-based optical log spiral rectenna for efficient energy harvesting at 28.3 THz. To maximize benefits enhanced field proposed nano-antenna in rectification process, considers antenna arms (Au) as electrodes rectifying diode insulator is placed between electrode terminals compact horizontal MIM rectenna. The rectifier insulator, Al2O3, was inserted hotspot located gap antennas. A detailed effect different symmetric...
Abstract This study presents, for the first time, a novel design of ultra‐wideband (UWB), circularly polarized and highly directive log‐spiral THz photoconductive antenna. The proposed antenna is simulated in High Frequency Structure Simulator using gold as electrode material which backed by quartz substrate (ε r = 3.78, tan δ 0.0001) hemispherical silicon‐based lens with diameter 140 μm. A comprehensive detailed parametric parameters performed frequency range 1 to 6 optimal developed...
Abstract A Vivaldi dipole rectenna system for infrared (IR) energy harvesting is investigated. First, a parametric study on the antenna performed to collect maximum electric field between poles. The arms were optimized achieve high‐efficiency system. two of formed using different metals, that is, gold and titanium. These metals have work functions, which facilitate diode operation through tunneling at zero bias. are overlapped, suitable insulator layer injected in overlapped area form...
This paper reported a pioneering 5G multiband microstrip line fed patch antenna for IoT, wireless power transfer (WPT) and data transmission. The proposed is accomplished using triple L-arms responsible the response. A diamond-shaped ground slot added to control increase bandwidth of resonant frequency. designed resonate at 10, 13, 17 26 GHz with 10 dB impedance bandwidths 0.67, 0.8, 2.45 4.3 respectively. fabricated technology total area 16.5x16.5 mm2. has sufficient realized gain 4.95,...
This paper presents the design of THz Vivaldi Antenna operating in frequency band 0.1-6 THz. An optimized antenna is developed by using CST software to realize an ultra-wideband impedance match, which ranges from 0.7 6 THz, as well a high directivity level, varies 3.8 dBi at 2.5 7.8 The gain Gmax found be -1.6 5.5 its efficiency η <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">max</sub> 16.3 % 5.25 both are relatively low because metallic and...
We present the design of all-dielectric Quarter-Wave Plate (QWP) and Half-Wave (HWP) metasurfaces based on elliptic dielectric resonators (EDRs) for transmission control electromagnetic waves over frequency band 20–30 GHz. First, an extensive numerical analysis was realized by studying effect geometry (thickness ellipticity) both <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:math>-...
This work presents a comprehensive detailed comparative study of the three ultra-wideband and high directive antennas for THz imaging, spectroscopy, communication applications. Three different types photoconductive (log-spiral, Vivaldi, bowtie antennas) are designed simulated in frequency range 1 to 6 CST microwave studio (MWS). The enhanced directivity PCAs is achieved with integration hemispherical silicon-based lens PCA gold electrode quartz substrate proposed antennas. performance...
This paper describes a Vivaldi nano-antenna with high performances designed to operate over the frequency band 5 - 30 THz, maximum localized electric field intensity across its gap. The proposed has advantage of focusing electromagnetic energy into small area around antenna slot. Linear polarized incident plane wave is used excite structure and then concentrate in obtained equal 81.47 V/m at 6.67 THz.
In this work a novel design of an ultra-wideband and highly directive Vivaldi photoconductive antenna (PCA) is reported for the first time THz sensing imaging applications. The optical-to-THz conversion efficiency enhanced directivity PCA by adding hemispherical silicon-based lens with gold electrode quartz substrate (Epsilon r = 3.78, tan delta 0.0001). optimization parameters performed in CST MWS frequency range 1-6 THz. has UWB -10 dB impedance 3-dB AR bandwidths 6 THz, maximum 10 dBi...
A novel approach for infrared (IR) energy harvesting through the integration of a resonating metasurface with metal-insulator-metal (MIM) nano-rectenna is presented. The absorption IR radiation at 28.3 THz significantly enhanced localization surface plasmons periodic on top log spiral MIM rectenna. Additionally, ground plane introduced backside structure to further enhance characteristics. Extensive characterization analysis antenna's absorbed E-fields incident conducted and without...
Passive ultra-high frequency radio identification systems (UHF RFID) have become essential components of contemporary logistics in various industries. They play a crucial role facilitating critical operations such as asset tracking, inventory management and supply chain optimization. However, the effectiveness these depends heavily on design efficiency antennas used. Therefore, this paper aims to improve passive UHF RFID antenna by adopting microstrip patch design. The proposed comprises...
This study reports the design of a dielectric resonator (DR) metasurface-based terahertz biosensor for rapid and accurate detection different kinds viruses (H1N1, SARA-COV-2, etc.). The characterization sensor is done by analyzing its absorbance properties with without presence H1N1 virus layer concentrations electrical in frequency range 2.4 THz to 3 THz. A full-wave EM model designed using CST MWS software. geometrical parameters proposed biosensor, as well constant swab, are varied...
This work presents the design and analysis of a novel metal-insulator-insulator-metal (MIIM) rectenna with an added meta lens on top it for efficient robust infrared (IR) energy harvesting at 28.3 THz. To ensure maximum transfer captured IR radiations by antenna better impedance matching, log-spiral terminals are used as electrodes while two different insulators placed between its feeding to form MIIM rectenna. A split ring-based resonating metasurface is designed focus incoming...
We describe an all-dielectric metasurface, based on elliptic dielectric resonators (EDRs), which is designed to work as a beam splitter at 16.98 GHz. The proposed metasurface refracts electromagnetic incident waves with orthogonal polarizations along two specific directions without reflection.
We investigated numerically the design of all-dielectric metasurface based on elliptic dielectric resonators (EDRs) operating between 20 and 30 GHz. The effect resonator geometry (size, thickness, ellipticity) transmission was studied from simulated modules phases both x- y-polarized incident transmitted waves.
We present a simple design of Quarter-Wave Plate (QWP) and Half-Wave (HWP) an all-dielectric metasurfaces based on Elliptic Dielectric Resonators (EDRs) minor radius 2.5 mm, ellipticity τ (τ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sub> =1.4 or xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> =1.6), relative permittivity 10.2, loss tangent 0.003 thickness 5.12 mm. The transmissions under x- y-polarizations the incident electric...
Abstract Metasurface tuning is performed using different ways for a wide range of applications. This study presents the design thermally‐tuned all‐dielectric reconfigurable metasurface. A microfluidic channel, filled with concentrations tellurium–selenium (Te‐Se) alloy, added on top elliptical dielectric resonator (EDR) unit cell considered The electrical properties used semiconductor alloy are varied in 400 to 700°C (steps size 100°C). impact thermal reflection and transmission...
This work presents the conception and design of log-periodic nano-antenna for infrared IR solar energy harvesting applications. The suggested contain three layers. first layer contains two arms made gold (Au), second is a quartz substrate finally, ground (Au) plane reflector. analysis proposed performed using FDTD technique in range frequencies [28 to 29 THz]. A huge parametric study was optimize different parameters (thickness arms, teeth angle, number teeth, thickness, solid angles, inner...
This work presents a comparative study between metal-insulator-metal (MIM) and metal-insulator-insulator-metal (MIIM) based optical log spiral rectennas for infrared IR energy harvesting at 10.6 μm. We have considered the antenna terminals as electrodes of rectifying diode we integrated insulators two arms (electrodes) to enhance harvested with proposed nano-antennas. The comparison performance (E-field, I/V, responsivity, resistivity) rectennas.