Papers by Zoubir Mahdjoub
Nano-resonator based broadband metamaterial absorber with angular stability operating in visible light spectrum for solar energy harvesting applications
Optical materials, Mar 1, 2024
EURAS Journal of Engineering and Applied Sciences, Dec 31, 2020
A triple band square-interlinked-rhombus shaped metamaterial absorber for microwave C and X-band utilizations
Optical and Quantum Electronics
In this research paper, a tri-band metamaterial absorber (MMA) is suggested to cover the satisfed... more In this research paper, a tri-band metamaterial absorber (MMA) is suggested to cover the satisfed level of absorption in the Microwave C- and X- band regions. The suggested MMA is structured by a unit cell which is printed on the top face of the FR4_Epoxy die- lectric substrate. The copper patch of the unit cell consists of an inter-coupled split ring metamaterial resonator (SIR-SRR) with a square shape for the outer ring and a rhombus shape for the inner one. The unit cell size is optimized for electrical dimensions of (0.195 𝜆0× 0.195 𝜆0× 0.029 𝜆0) where 𝜆0 is the free space wavelength and is calculated at the low- est operating frequency of 5.86 GHz. The design of the SIR-SRR has passed through fve stages according to fve diferent models to have three absorption peaks. To understand the absorber behavior, a parametric study has been executed and discussed. The obtained results for the absorption qualities of the prescribed MMA show that it has co-polarization insensitive absorptions up to 180° and incident angle stability up to 90° for both trans- verse electric (TE) and transverse magnetic (TM) modes. It shows three absorption peaks of 86.23, 92.92 and 82.07% at frequencies of 5.86, 6.57 and 8.94 GHz, respectively for utilizations in microwave C- and X-bands. The proposed MMA presents efective electro- magnetic qualities for microwave applications, especially for satellite, sensors and radar communications.
Journal of Microwaves, Optoelectronics and Electromagnetic Applications, Sep 1, 2018
In this manuscript, a novel hybrid dielectric resonator antenna for ultra wideband (UWB) applicat... more In this manuscript, a novel hybrid dielectric resonator antenna for ultra wideband (UWB) applications is designed, and single band notched performance is proposed. The circle radiating patch is printed on the FR4 substrate of 1.64 mm thickness and loss tangent tan =0.02, and is fed by the coplanar waveguide. The size of the UWB antenna was minimised to 50-40 mm 2. The cylindrical dielectric resonator (CDR) was used to broaden the bandwidth and achieve an impedance bandwidth of more than 113%, covering a frequency range of 3.3 to more than 12GHz. WIMAX band notched characteristics of the antenna to reject (3.2-3.8GHz) were realised by etching a U-shaped slot in the radiating patch. The centre notch frequency can be adjusted from 3.4 to 4.5 GHz by changing the position of the CDR. The band notched characteristics, VSWR, and radiation patterns were studied using the CST microwave simulator and confirmed with the frequency domain ANSOFT high frequency structure simulator (HFSS).
Engineering, Technology & Applied Science Research, Apr 11, 2021
Digital images have become an essential working tool in several areas such as the medical field, ... more Digital images have become an essential working tool in several areas such as the medical field, the satellite and astronomical field, film production, etc. The efficiency of a transmission system to exchange digital images is crucial to allow better and accurate reception. Generally, transmitted images are infected with noise. In the medical field, this noise makes the process of diagnosing difficult. To eliminate the transmission errors, an Error Correcting Code (ECC) can be used with the aim to guarantee excellent reception of the images and allowing a good diagnosis. In this paper, source and channel encoding/ decoding functions are studied during medical image transmission (LUNG). At first, the Turbo-Code (TC) is used as ECC and subsequently the Turbo-Trellis Coded Modulation (TTCM). The simulation results represent the curves giving the Bit Error Rate (BER) as a function of the signal to noise ratio (E b /N 0). In order to compare these two systems properly, the MSSIM (Mean Structural Similarity) parameter was used. The obtained results showed the effect and importance of ECC on the transmission of medical images using TTCM which gave better results compared to TC with regard to increasing the performance of the transmission system by eliminating transmission noise.
One-Layer and Dual-Polarized Metamaterial Inspired Antenna Using Dodecagon Split Ring Resonator Mushroom and Metasurface for Terahertz Applications
Springer eBooks, 2023
Patch antenna loaded with C-DNM for X-band applications
This paper proposes patch antenna for X-band [8.2 GHz; 12.4 GHz] and military applications, enhan... more This paper proposes patch antenna for X-band [8.2 GHz; 12.4 GHz] and military applications, enhanced by double negative metamaterial complementary (C-DNM) cells. Two different structures will be presented and discussed, which involve: (1) C-DNM with square patch antenna, and (2) C-DNM with circular patch antenna. The antenna was designed with resonance frequency around at 12 GHz. The metamaterial substrate has a potential to maintain the amplitude of the reflection coefficient at the specific resonant frequency as well as increase the directivity gain and/or the bandwidth. The focusing parameter is to achieve a better directivity gain and wide radiation pattern that obtained from a structure with several cells C-DNM for circular patch antenna. The simulations show that the addition of C-DNM to circular patch antenna provides better performance in terms of directivity 7.45dB to 7.88dB for circular patch. For square patch; the antenna is contributing the best reflection coefficient value than −40.36 dB and value of 7.74 of directivity gain.
Tunable Multiband Devices Based on ON/OFF Switches in Metamaterials SOR for WIFI Application
In this paper, a new design of stopband filters, based on a coplanar waveguide loaded with resona... more In this paper, a new design of stopband filters, based on a coplanar waveguide loaded with resonator elements, is presented. The structure is composed of four split octagonal resonators (SOR), with three cases according to the angular position of the gaps created by ON/OFF switches in the inner and outer resonators. The design is based on the use of a metamaterial to create notch filters for microwave applications. From the simulation results, the filters exhibit high frequency selectivity via the presence of transmission zeros. To confirm the generation of the rejection bands, an ultra-wideband (UWB) circular monopole antenna is added to the filter. The extracted data are also compared with filter simulation results, revealing good agreement.
Frequenz, Apr 20, 2023
In this paper, a wide bandwidth (20 GHz) and small sized (200×200×50 µm 3) terahertz (THz) square... more In this paper, a wide bandwidth (20 GHz) and small sized (200×200×50 µm 3) terahertz (THz) square graphene ribbon antenna using Photonic Band Gap (PBG) substrate are investigated in the 0.6-0.8 THz band. The proposed antenna consists of graphene as radiating patch mounted on four types of ground plane. The important aim of this work is to eliminate the second resonance frequency by utilize a several types of ground plane and keep a single frequency by improving the performance of the proposed antenna. The effect of change ground plane on the performance of antenna is compared, in terms of re ection coe cient, bandwidth, directivity and radiation pattern. The antenna has achieved good gain (7.62 dB) and good directivity (6.38 dB) in comparison to work reported in the literature.
A miniaturized folded square split ring resonator cell based dual band polarization insensitive metamaterial absorber for C- and Ku-band applications
Optical and Quantum Electronics
In this article, a compact dual-band metamaterial absorber (MMA) is suggested for the purpose of ... more In this article, a compact dual-band metamaterial absorber (MMA) is suggested for the purpose of solid materials sensing in the C-and Ku-wireless bands. The proposed MMA is formed by a basic cell based on a novel shape of the folded arms square split ring resonator (FAS-SRR).The size of the cell forming the absorber is optimized for an electrical dimension of 0.27 λ 0 × 0.27 λ 0 × 0.034 λ 0 , where λ 0 is the free space wavelength calculated at 6.78 GHz. The physical behavior of the MMA has been explored by equivalent circuit model representing the frequency response as well as electromagnetic field analysis of the FAS-SRR. The MMA is used as a solid material sensor in both C-and Ku-bands. The material under test (MUT) is placed on the FAS-SRR patch to ahave a compact structure. The direct contact between the MMA and the MUT causes shifts in resonance frequencies in the two bands which makes the sensor more sensitive. For the MUT, we tested four materials with different permittivity ranging from 2.17 to 3.55. Simulation results show that the MMA has polarization-insensitive absorption with incident angle stability up to 45° for both transverse electric (TE) and transverse magnetic (TM) modes. The proposed MMA absorbs in the C-and Ku-band with two absorption peaks near-unity; one of them is located for an absorption coefficient of 91.73% at 6.78 GHz. The second absorption rate of 99.97% is located in the Ku-band at 13.92 GHz. The proposed MMA shows good detection qualities with a sensitivity of 4.62% (800 MHz frequency shift) at the lower band and 4.53% (1610 MHz frequency shift) at the upper band. All these absorption and sensing qualities of the proposed MMA with unique shape make it a potential candidate for solid materials sensing in microwave frequency spectrum. Keywords Dual-band • Metamaterial absorber • Microwave frequencies • Solid materials sensing • Split ring resonator Extended author information available on the last page of the article Content courtesy of Springer Nature, terms of use apply. Rights reserved.
Performance Optimization of Optical Access Networks Using Two Optical Amplifiers EYDWA and SOA in Cascade
Progress In Electromagnetics Research Letters
Designing of tri-band bandpass microwave filter based on (E–Z) inter-coupled tapered metamaterial resonators for C- and X-band applications and operations
Applied Physics A, Nov 24, 2022
Journal of Nano- and Electronic Physics, 2022
Metamaterial absorber (MA) is of particular interest due to its numerous potential applications i... more Metamaterial absorber (MA) is of particular interest due to its numerous potential applications in sensing, microwave detection, energy harvesting, miniaturized electronic components, bolometers, and thermal detectors. In this paper, a new MA has been provided. The proposed MA is a microwave structure consisting of a network of four split ring resonators (SRRs) of magnetic resonance and negative permeability ( 0): one central SRR has a triangular shape and three other SRRs have a square shape and the same dimensions. All SRRs are printed on the upper surface of the FR_Epoxy substrate (r 4.4; tg 0.02), its dimensions are chosen to obtain the resonance at the X-band frequency. To eliminate transmission, we add a copper conductive metal plate that will be etched on the upper face of the same substrate. The main advantage of this study based on the proposed structure is that it is possible to control its absorption percentage for X-band radar applications.
Effects of Ground Plane on a Square Graphene Ribbon Patch Antenna Designed on a High-Permittivity Substrate with PBG structures
In this paper, a wide bandwidth (20 GHz) and small sized (200×200×50 µm3) terahertz (THz) square ... more In this paper, a wide bandwidth (20 GHz) and small sized (200×200×50 µm3) terahertz (THz) square graphene ribbon antenna using Photonic Band Gap (PBG) substrate are investigated in the 0.6–0.8 THz band. The proposed antenna consists of graphene as radiating patch mounted on four types of ground plane. The important aim of this work is to eliminate the second resonance frequency by utilize a several types of ground plane and keep a single frequency by improving the performance of the proposed antenna. The effect of change ground plane on the performance of antenna is compared, in terms of reflection coefficient, bandwidth, directivity and radiation pattern. The antenna has achieved good gain (7.62 dB) and good directivity (6.38 dB) in comparison to work reported in the literature.
Contribution à l’étude et à la conception d’antennes destinées aux télécommunications Multi-Bandes et Large-Bande
UWB Monopole Antenna with Reconfigurable Notch Bands based on Metamaterials Resonators
2018 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting, 2018
This paper presents a new design of ultra-wideband (UWB) circular monopole antenna with reconfigu... more This paper presents a new design of ultra-wideband (UWB) circular monopole antenna with reconfigurable bands rejection. The proposed approach is based on loading dual pairs of Split Ring Resonator (SRR) and Rectangular Spiral Resonator (RSR) on the CPW fed monopole antenna. According to the ON/OFF PIN diode states, a notch band is created in the UWB antenna. The proposed antenna was successfully designed and simulated using Ansoft HFSS. The simulated results showed good results in terms of reconfigurability in several rejection bands. This reconfigurable UWB antenna is suitable for isolation with coexistences narrowband standards (WIFI, WIMAX and satellite service) in wireless communication systems.
Journal of Engineering and Applied Science
In a world where communication requires ever faster data transmission capable of transmitting hig... more In a world where communication requires ever faster data transmission capable of transmitting high speeds. In order to reach and transmit this high speed, it is necessary to increase the frequency that carries the information. For this, scientists are interested in the terahertz (THz) range which, thanks to its high frequencies between 0.1 THz and 30 THz, offers the possibility of increasing the data rate. This letter presents the inclusion of Dodecagon Split Ring Resonator (D-SRR) in rectangular microstrip patch antenna and its effect in the performance of the proposed antenna. The metamaterial design employs two types of SRRs resonators shapes such as the Dodecagon Broadside Coupled Split Ring Resonator (DBC-SRR) and Dodecagon Split Ring Resonator (D-SRR). The model applied uses a local field approach and allowed to obtain the dispersion characteristics of discrete negative magnetic permeability. The proposed antenna substrate uses Arlon AD1000 material, which helps to attain high...
Investigation of a Near-Perfect Quad-Band Polarization-Insensitive Metamaterial Absorber Based on Dual-T Circular Shaped Resonator Array Designed on a Silicon Substrate for C-, X- and Ku-bands Applications
Silicon
Investigation of dual-band bandpass filter inspired by a pair of square coupled interlinked asymmetric tapered metamaterial resonator for X-band microwave applications
Bulletin of Materials Science
Frequency reconfigurable circular microstrip patch antenna with slots for cognitive radio
TELKOMNIKA (Telecommunication Computing Electronics and Control)
In this paper, a novel multi-frequency microstrip antenna with complementary ring slot resonator ... more In this paper, a novel multi-frequency microstrip antenna with complementary ring slot resonator (CRSR) structure that satisfies Bluetooth, worldwide interoperability for microwave access (WiMAX), and wireless local area network (WLAN) applications is proposed. The conventional antenna consists of a circular microstrip patch at a resonance frequency band of 2.5 GHz. By loading two CRSR at the radiating element, three operating frequency bands 2.5 GHz, 3.6 GHz, and 5.2 GHz are achieved. The operational bands covered by the antenna are Bluetooth 2.5 GHz, WiMAX 3.6 GHz, and WLAN 5.2 GHz. The insertion of CRSR to patch antenna has made it possible to compact and simple design, and miniaturized antenna for cognitive radio. Moreover, the directivity of the proposed antenna is adequate with acceptable radiation properties and perfectly matches with the simulated and measured results.
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Papers by Zoubir Mahdjoub