Browsing by Author "Soliman, Mohamed S."

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A Symmetric Plus-Shape Resonator Based Dual Band Perfect Metamaterial Absorber for Ku Band Wireless Applications
(Elsevier, 2023-09-01) Hasan, Md Shakibul; Islam, Mohammad Tariqul; Moniruzzaman, Md; Samsuzzaman, Md; Rmili, Hatem; Misran, Norbahiah; Uddin, Md Kutub; Soliman, Mohamed S.
In this article, introduce a metamaterial for microwave absorber applications based on a variant of the symmetric plus-shape resonator. This MA has two absorption peaks, making it suitable for Ku frequency band use. The MA unit cell built on a cheap FR4 substrate. The unit cell's resonator is designed in the form of a four-plus-shape with an eight-square-point in one of the corners, and its dimensions have been tweaked to achieve maximum absorption peaks of 99.04%, and 99.90% at 12.32 GHz, and 16.00 GHz, respectively. Analysing the surface current, electric and magnetic fields, permittivity, permeability, and normalised impedance provides insight into the nature of metamaterial and absorber. The incidence and polarization angle insensitivity of the suggested dual-band absorber allows for pretty much constant absorbance efficiency when the angle is changed. Moreover, for both TE mode and TM mode, the developed metamaterial absorber demonstrates near unity absorption for polarization and oblique incident angles up to 90°. These are single negative metamaterial qualities. The fact that the patch as a whole is rotationally symmetrical is one of the most important factors in determining whether or not it will retain its polarization-insensitive quality. Because of its outstanding insensitivity performance and nearly perfect absorption, it could be a good option for use in Ku band applications.
Double elliptical resonator based quad-band incident angle and polarization angle insensitive metamaterial absorber for wireless applications
(Scopus, 2024-04-24) Hasan, Md. Shakibul; Islam, Mohammad Tariqul; Samsuzzaman, Md.; Alamri, Saeed; Albadran, Saleh; Moniruzzaman, Md.; Soliman, Mohamed S.
In this article, a double elliptical split ring resonator-based quad band metamaterial absorber (MMA) is demonstrated for applications in the microwave range. The resonator is made up of four squares outside split rings and two elliptical split rings positioned in the middle of the structure. The resonating patch is placed over an FR-4 dielectric layer with a thickness of 1.6 mm. The unit cell has an electrical size of 0.103λ0 × 0.103λ0, where λ0 is the wavelength determined at 2.576 GHz. The MMA shows maximum absorption of 99.83% at 2.576 GHz, 99.98% at 5.648 GHz, 99.56% at 8.32 GHz, and 99.15% at 13.456 GHz with TE mode. For TM mode, at 2.576 GHz, 5.632 GHz, 8.304 GHz, and 13.44 GHz, corresponding absorptions are 99.21%, 99.67%, 99.5%, and 99%, respectively. The MMA is polarisation and incidence angle (0° to 90°) insensitivity for both TM and TE modes. The unit cell provides single negative characteristics including an EMR (effective medium ratio) of 9.71 and a Q factor (quality factor) over 25. The proposed MMA provides high harvesting efficiencies of 92.87%, 76.9%, 94.12%, and 90.97% for frequencies of 2.57 GHz, 5.64 GHz, 8.32 GHz, and 13.45 GHz, correspondingly. The equivalent circuit is modeled to understand the resonance behavior of the MMA and the circuit parameters are determined and validated using Advanced Design Systems (ADS) software. The performance of the MMA is examined using the prototype of the array of the unit cells in an experimental setup. The experimental outcome provides a close similarity with simulation outcomes indicating the good performance of the MMA. The metamaterial absorber's high performance makes it suitable for many applications, such as RF energy harvesting applications, image technologies, stealth technologies, and radar systems as well as minimizing electromagnetic interference in satellites.
Preparation of New Flexible Antenna Based on Sol-Gel Synthesized MgxCa(0.9-x)Zn0.10Fe2O4 Nanoparticle for Microwave Imaging Applications
(Daffodil International University, 22-08-24) Rahman, Md Atiqur; Islam, Mohammad Tariqul; Hossain, Amran; Singh, Mandeep Jit; Albadran, Saleh Mohammad; Soliman, Mohamed S.; Samsuzzaman, Md
This article prepares, MgxCa(0.90-x)Zn0.10Fe2O4 nanoparticle-based new flexible microwave substrate materials to build flexible antennas. The MgxCa(0.90-x)Zn0.10Fe2O4 nanoparticles are synthesized using the sol-gel chemical method. There are three different weight percentages are chosen for “X” values i.e., X= 25%, 50%, and 75%. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and transmission electron microscopy (TEM) studies are used to evaluate the structural and morphological features of the produced nanoparticles. Dielectric Assessment Kit is also used to evaluate the nanoparticles' tunable dielectric characteristics (DAK). Loss tangents range from 0.00275 to 0.00675 while dielectric permittivity values range from 3.25 to 4.75. The magnetic characteristics of the produced samples are also investigated using the vibrating sample magnetometer (VSM). The Agilent 8501E module is used to calculate the adjustable magnetic permeability and magnetic loss tangent values. The magnetic permeability and magnetic loss tangent values obtained are in the range of 1.00 to 1.15 and 0.0035 to 0.0065, respectively. Later, a flexible antenna is designed on the prepared flexible substrate that operates within the frequency range of 1.60 GHz to 3.00 GHz with a maximum gain of 5.15 dBi. After that, this antenna is incorporated with a nine-antenna array-based portable microwave head imaging system. Finally, successful brain tumor detection is observed by post-processing the collected scattering parameters with an image reconstruction algorithm. The overall results ensure that the MgxCa(0.90-x)Zn0.10Fe2O4 nanoparticle-based new flexible microwave substrate materials can be a potential candidate for microwave head imaging and are suitable to fit with microwave devices.
Tunable Asymmetric Square Split Ring Resonator Based Triple Band Metamaterial Absorber for Wireless Communication System
(Elsevier, 2024-01-20) Hasan, Md Shakibul; Islam, Mohammad Tariqul; Samsuzzaman, Md.; Alorifi, Fawzi; Shamsan, Zaid Ahmed; Almuhanna, Khalid; Rahim, Sharul Kamal Abdul; Soliman, Mohamed S.
This article presents a triple band square split ring with double circular split ring resonator incident angle-insensitive perfect metamaterial absorber. The MMA unit cell was manufactured using a FR4 substrate that had dimensions of 8 mm by 8 mm. With the flexibility of on-design adjusting of the highest absorption frequencies, the suggested MA displays peak absorption of 99.67 %, 99.85 %, and 99.97 % at 2.52 GHz, 6.99 GHz, and 9.28 GHz, correspondingly. The tuning metallic two circular split rings and square split ring resonator provide the possibility of frequency modification throughout three distinct frequency ranges: the first frequency range extends from 2.45 GHz to 2.53 GHz, the second frequency range extends from 6.91 GHz to 7 GHz, and the third frequency range extends from 8.85 GHz to 10.32 GHz. Furthermore, the suggested MA displays near-zero absorption at an oblique incidence angle of up to 45° for both the TE as well as TM modes. The unit cell demonstrates single negative properties, such as an effective medium ratio (EMR) of 14.88 and a quality factor (Q factor) that is more than 30 for both the TM mode as well as the TE mode. An equivalent circuit successfully demonstrated its performance capability, which indicated that it would create an MMA of good quality when using ADS software. A comparison between the measured results of the suggested MMA and the simulated one reveals that there is a significant amount of a similarity between both of them. Because of its easy design within small dimension, wide angular stability, strong absorption, good EMR, and flexibility to frequency tuning is suitable for a wide range of wireless communication system, especially satellite applications like electromagnetic interference reduction, radar systems, imaging, and stealth technology.
Tunable asymmetric square split ring resonator based triple band metamaterial absorber for wireless communication system
(Scopus, 2024-01) Hasan, Md Shakibul; Islam, Mohammad Tariqul; Samsuzzaman, Md; Alorifi, Fawzi; Shamsan, Zaid Ahmed; Almuhanna, Khalid; Rahim, Sharul Kamal Abdul; Soliman, Mohamed S.
This article presents a triple band square split ring with double circular split ring resonator incident angle-insensitive perfect metamaterial absorber. The MMA unit cell was manufactured using a FR4 substrate that had dimensions of 8 mm by 8 mm. With the flexibility of on-design adjusting of the highest absorption frequencies, the suggested MA displays peak absorption of 99.67 %, 99.85 %, and 99.97 % at 2.52 GHz, 6.99 GHz, and 9.28 GHz, correspondingly. The tuning metallic two circular split rings and square split ring resonator provide the possibility of frequency modification throughout three distinct frequency ranges: the first frequency range extends from 2.45 GHz to 2.53 GHz, the second frequency range extends from 6.91 GHz to 7 GHz, and the third frequency range extends from 8.85 GHz to 10.32 GHz. Furthermore, the suggested MA displays near-zero absorption at an oblique incidence angle of up to 45° for both the TE as well as TM modes. The unit cell demonstrates single negative properties, such as an effective medium ratio (EMR) of 14.88 and a quality factor (Q factor) that is more than 30 for both the TM mode as well as the TE mode. An equivalent circuit successfully demonstrated its performance capability, which indicated that it would create an MMA of good quality when using ADS software. A comparison between the measured results of the suggested MMA and the simulated one reveals that there is a significant amount of a similarity between both of them. Because of its easy design within small dimension, wide angular stability, strong absorption, good EMR, and flexibility to frequency tuning is suitable for a wide range of wireless communication system, especially satellite applications like electromagnetic interference reduction, radar systems, imaging, and stealth technology.
Tunable Cross-Coupled metallic elements loaded epsilon negative and Near-Zero index characteristics based metamaterial
(Daffodil International University, 2023-01-23) Hossain, Ismail; Islam, Mohammad Tariqul; Sahar, Norsuzlin Binti Mohd; Moubark, Asraf Mohamed; Soliman, Mohamed S.; Samsuzzaman, Md
This study examines epsilon-negative (ENG) and near-zero index (NZI) tunable cross-coupled (TCC) met material (MTM) unit cells for multi-band wireless communications. The square split ring resonator (SSRR), a cross-coupled metallic element, and a star-like shape are added at the center of the resonator. The EMR value is 10.24, representing the proposed structure's compactness. The tunability characteristics are investigated by varying the cross-coupled nearby metallic element length within the frequencies of 3.38–3.44 GHz, 7.53–8.0 GHz, and 10.24–10.79 GHz. The NZI characteristics are observed within the frequencies of 3.40–4.66 GHz, 7.41–7.75 GHz, and 10.17–10.31 GHz, respectively, while the ENG characteristics are observed at 2.61–5.15 GHz, 6.43–8.23 GHz, and 9.28–10.45 GHz, respectively. The bandwidth of the designed TCC MTM unit cell is 2.49–4.00 GHz, 6.89–7.83 GHz, and 9.75–10.64 GHz, respectively. The tunability, ENG, and NZI characteristics with a high EMR value enable it for critical microwave applications, including S, C, and X frequency bands. The anticipated structure may be a good candidate for enhancing the gain and bandwidth of the antenna and filter designs and operations, as well as frequency stability and efficiency for multi-band wireless communications.