Nabil Dakhli

SupCom, Telecommunication, Department Member

Followers

Following

Public Views

I'm an antenna researcher
Address: Tunisia

less

Nicole Herbots

Arizona State University

Christos Argyropoulos

University of Nebraska Lincoln

Brandon Kemp

Arkansas State University

Noor Azwan Shairi

Universiti Teknikal Malaysia Melaka

Monish Chatterjee

University of Dayton

Tayfun Nesimoglu

Middle East Technical University

Kar Heng Lee, Ph.D

Edith Cowan University

Kai LU

City University of Hong Kong

Elara Bertho

Centre National de la Recherche Scientifique / French National Centre for Scientific Research

Jephias Gwamuri

National University of Sciences & Technology (NUST)

Interests

Uploads

Papers by Nabil Dakhli

Dual Band Metamaterial Inverted-L Antenna

2019 IEEE 19th Mediterranean Microwave Symposium (MMS), 2019

A coplanar waveguide (CPW) planar inverted-L antenna (PILA) is proposed. It uses a Composite Righ... more A coplanar waveguide (CPW) planar inverted-L antenna (PILA) is proposed. It uses a Composite Right/Left Handed (CRLH) transmisssion line metamaterial loading in order to achieve a dual band operation. It is shown that this unit cell produces a new resonant mode at 1.8 GHz plus the folded monopole mode at 3.5 GHz. The associated −10 dB bandwidth fractions around each of these frequencies are 9.2% and 22.9%, while the corresponding peak gains and radiation efficiencies are −2.6 dBi (51.64%) and 2.59 dBi (93.8%), respectively. The radiator has a total size of $55\times 54.5\times 1.6\ \text{mm}^{3}$ or $0.33\lambda\times 0.32\lambda\times 0.009\lambda$ at 1.8 GHz.

Rectifier Circuit Design for IoT and 5G Applications

2022 IEEE 9th International Conference on Sciences of Electronics, Technologies of Information and Telecommunications (SETIT)

A Planar Parabolic Patch Antenna for UWB Applications

For the purpose of wideband operations, partial grounded substrate patch antenna is investigated.... more For the purpose of wideband operations, partial grounded substrate patch antenna is investigated. The antenna consisted of a parabolic planar monopole printed on a thin dielectric FR4 epoxy substrate of ε r = 4.4 permittivity and is fed through a partial grounded substrate mi-crostrip line. Various prototypes with different parabolic contours equations and the same length are analysed using Ansoft HFSS electromagnetic simulator based on the finite element method and measured using a vector network analyser Anritsu 37369C (40MHz to 40 GHz) where the calibration plane is the SMA connector jack used to connect the antenna. The best simulated and measured results where obtained for a parabolic planar patch monopole antenna defined by the geometrical equation y = 0.044x 2 . These results concord and proved the ultra wide band behaviour of this design. Nevertheless, the bandwidth is ranging from 3.5 GHz to 16 GHz for a V SW R < 2. It includes the wireless local area (WLAN) band such as...

Download

Characterization of a CRLH TL Unit Cell by Nicholson-Ross-Weir (NRW) Method

In this paper, the characteristics of a composite right− and left− handed (CRLH) transmission lin... more In this paper, the characteristics of a composite right− and left− handed (CRLH) transmission line unit cell is discussed. Characterization is based on the effective medium concept by using Nicholson-Ross-Weir method. This technique manipulates the scattering parameters obtained from full-wave simulation of the CRLH unit cell. The retrieval process is needed to determine the equivalent circuit model which consists of the series interdigital capacitor (IDC) and shunt grounded stub inductor (SGSI) in asymmetric configuration. According to this method, the complex effective permeability and permittivity can fully define an artificial structured metamaterials, considered in general inhomogeneous mediums.

Download

A Tri-Band Zeroth-Order Metamaterial-Loaded Monopole Antenna for ISM Applications

The ISM protocol has already been used for a long time to realize customer-specific communication... more The ISM protocol has already been used for a long time to realize customer-specific communication solutions for short and middle distances, which ensure an efficient data transfer, a better reliability and good adaptation for applications which require a low rate of data transfer. The objective of this work is to design a tri-band low-profile small-footprint antenna, which supports the European 434 MHz/868 MHz and the US 315 MHz ISM bands. The radiation mechanism of the antenna is based on the posts, which are connected in series to an inductor at each edge of a transmission line in between. Calibrating the flowing currents in the vias by tuning the inductances values, radiated fields are constructive in the far field region. Full-wave simulations were carried in order to study the properties of the antenna at three different frequencies. The antenna offers a fractional bandwidth of 0.59 %, 0.87% and 2.18%, a radiation efficiency of 12.54%, 38.66% and 77.36% at 315 MHz, 434 MHz and ...

Download

Low Frequency Monopole-Like Small Metamaterial Antenna

In this paper; we propose a monopole-like small antenna resonating at low frequency. The main rad... more In this paper; we propose a monopole-like small antenna resonating at low frequency. The main radiating elements of the antenna are the two vias which are connected in series to an inductor at each edge of a transmission line in between. The inductance values are tuned in order to calibrate the flowing currents in the posts to be in phase so that the radiated fields are constructive in the far field region. Full-wave simulations were carried in order to study the properties of the antenna at 434 MHz. The antenna offers a fractional bandwidth of 1.08%, a radiation efficiency exceeding 50%, and a monopole-like radiation pattern.

Download

Compact pentamode, tri-band metamaterial antenna for wireless applications

Proceedings of the 2012 IEEE International Symposium on Antennas and Propagation, 2012

ABSTRACT A novel compact pentamode, triband coplanar waveguide fed metamaterial antenna is propos... more ABSTRACT A novel compact pentamode, triband coplanar waveguide fed metamaterial antenna is proposed. The left-handed (LH) inductance is provided by two parallel short ended spiral inductors. We achieved pentamodes of resonance consisting of negative modes, zeroth mode and positive modes. The resonance frequency at each of these modes are f-2=1.01 GHz, f-1=2.11 GHz, f0=2.48 GHz, f+1= 3.04 GHz and f+2=3.54 GHz with triband obtained at f-2, f0 and f+2 resonances. Gain of the proposed structure obtained was about 1.415 dB. The proposed antenna serves the criteria for multiband applications with an additional feature of increased bandwidth at the zeroth mode. The operational bandwidth covers the required bandwidths of the IEEE 802.11 wireless local area networks (WLAN) standards and worldwide interoperability for microwave access (WiMax) standards. This proposed antenna is most suitable for precise applications in point to point wireless communication.

3D FDTD analysis of a compact UWB planar antenna

2011 11th Mediterranean Microwave Symposium (MMS), 2011

ABSTRACT

Multiband small zeroth-order metamaterial antenna

Applied Physics A-materials Science & Processing, 2011

A novel resonant metamaterial antenna based on the Composite Right/Left-Handed (CRLH) transmissio... more

Download

Resonant antenna based on CRLH TL

In this paper, a study of the compact microstrip antenna based on composite right/left handed (CR... more In this paper, a study of the compact microstrip antenna based on composite right/left handed (CRLH) metamaterial transmission line is presented. The physical size and operational frequencies of the antenna are determined by the CRLH metamaterial's unit cell. The antenna exhibits monopolar radiation at its fundamental mode of resonant frequency. As it is well known that the composite right/left-handed (CRLH) transmission line (TL) has unique property of an infinite-wavelength wave at specific non-zero frequency because of zero permittivity and permeability [1], [2], [6]. Generally, CRLH includes both LH series C/shunt L and parasitic RH series L/shunt C in its circuit model, resulting in a structure which is LH at lower frequencies and RH at higher frequencies.The operation bandwidth cover the required band widths of the IEEE 802.11 wireless local-area networks (WLAN) standards and worldwide interoperability for microwave access (WiMax) in the 2.97 GHz, 3.345GHz and 3.79 GHz (3.49-3.79 GHz).The zeroth order resonant frequency was found to be at 3.79GHz. IndexTerms---Metamaterials, CRLH TL, backward wave, electrically small antennas.

Download

Dual Band Metamaterial Inverted-L Antenna

2019 IEEE 19th Mediterranean Microwave Symposium (MMS), 2019