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248 results on '"Aliqab, Khaled"'

37. Advanced RF/microwave filtering circuits for wireless communications and radar applications

Author

Aliqab, Khaled Mohammad Munahi and Hong, Jia-Sheng

Abstract

The recent rapid development in modern communication systems has presented some constraints caused by the introduced noises, as well as further requirements of low costs and miniature designs. Such noises are overcome using efficient designs of filtering devices which are essential components in many satellite, radar and mobile communication systems. As a result, balanced or differential filtering components have recently received increasing attention. A wideband microstrip balanced bandpass filter based on modified stub line approach is presented in here. The proposed idea of extended transmission lines (TLs) at the input and output (I/O) ports enables for very good stopband rejection and common-mode suppression. On the other hand, the recently introduced multilayer liquid crystal polymer (LCP) material and fabrication technique are exclusively applied in this work for adapting the potential solutions offered within. Therefore, a comprehensive in-house fabrication process has been developed and extensively illustrated in this thesis starting from mask preparation covering the entire procedure up to producing the final piece of output. As a demonstrator of the potential capability of multilayer LCP technology, a novel miniaturized ultra-wideband (UWB) balun with self-packaging is introduced in this study. The broadside coupled stripline structure is adopted in this work to realize UWB performance and TEM mode which results in excellent amplitude and phase balances. In turn, a novel compact UWB multilayer balanced bandpass filter using LCP technology is also presented in this thesis. The design utilizes the transversal signal-interference concept for realizing an outstanding common-mode suppression while constructed in a stripline configuration. All of the designs covered in this thesis are initially simulated using CAD tools to be then validated by measurements of fabricated prototypes.

Published
2021

49. Graphene-based metasurface solar absorber using Fe–Fe2O3–Ti multilayer structure.

Author

Alsharari, Meshari, Han, Bo Bo, Patel, Shobhit K., Ali, Naim Ben, Aliqab, Khaled, and Armghan, Ammar

Abstract

The generating absorber design for the thermal heating system is contributed with the three-layer composition of a resonator layer using iron, the substrate part by Ferric oxide, and the design's bottom layer in Titanium respectively. The exposed absorption rates depend on the overall range of wavelength and can be identified with the best wavelength numbers (µm) of 0.37, 0.61, 0.88, and 2.11. The overall bandwidth number that we can present for the current design is 2800 nm by the wavelength separation of 0.2 and 3 µm and shows an effective percentage of 93.34%. The other two bandwidth numbers over the 2800 nm are 1500 nm (95.1%) by a wavelength separation of 1.5 and 3 µm, and 1000 nm (97.54%) with a wavelength configuration of 1.5 and 2.5 µm. With the respective presentation of the current design, the used material types and parametric rates, the analysis exploration of the changed parametric values, and the conclusion of the proposed work will be presented properly. The generated solar absorber can be used in a variety of various industrial applications of food processing, mineral processing, water desalination, and chemical production. [ABSTRACT FROM AUTHOR]

Published
2024
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