Article
Computer Science, Information Systems
Zizhuo Sun, Xiaolong Wang, Lei Zhu, Geyu Lu
Summary: This paper presents a novel synthesis method for designing a class of multi-section ultra-wideband Wilkinson power dividers with an arbitrary power ratio. The proposed power divider utilizes cascaded asymmetric coupled line sections and isolation resistors. The synthesis method is demonstrated to have several unique novelties, including the exact realization of Chebyshev equal-ripple performance without Hansen's approximation and the achievement of controllable in-band equal-ripple performance for all S-parameters of the power divider. Design examples and fabricated circuits validate the effectiveness of the proposed synthesis method.
Article
Engineering, Electrical & Electronic
Seonjeong Park, Songcheol Hong
Summary: This letter presents a four-way millimeter-wave differential Wilkinson power divider (WPD) with broadband characteristics using multisectional coupled inductors. It has a compact size and shows excellent performance in terms of insertion loss and isolation in the frequency range of 20-44 GHz.
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Yan Ding, Jing Wan, Yuepeng Yan, Xiaoxin Liang
Summary: This letter presents a novel lumped element circuit topology for the Wilkinson power divider (WPD) with compact and wideband performance using the bandpass matching network. The design method is inspired by even and odd modes analysis techniques, and the odd-mode circuit has the same grade as the even-mode one by an improved isolation network. The design equations for the proposed WPD are derived by analyzing the Z parameter, and the fabricated power divider based on the GaAs-integrated passive device (IPD) technology shows excellent performance.
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Weihao Zhang, Zhewang Ma, Fan Liu, Masataka Ohira
Summary: A novel compact wideband Wilkinson Power Divider (WPD) is proposed and analyzed using even- and odd-mode theory, achieving low return loss and wide operating frequency band. The designed microstrip WPD has a center frequency of 3.0 GHz and covers a frequency band of 1.5 to 4.5 GHz with satisfactory performance.
IEICE ELECTRONICS EXPRESS
(2021)
Article
Engineering, Electrical & Electronic
Myeongha Hwang, Gyoungdeuk Kim, Sangkil Kim, Nathan Seongheon Jeong
Summary: The article introduces an antenna structure for CubeSat applications with reconfigurable pattern and polarization. It achieves monopole-like omnidirectional linearly polarized gain patterns in planar mode and circularly polarized gain in folded mode, with good cross-polarization suppression ratio and axial ratio values.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Computer Science, Information Systems
Jingchang Nan, Jiuyang Zhao, Mingming Gao, Wendong Yang, Minghuan Wang, Huan Xie
Summary: The proposed compact 8-states frequency reconfigurable ultra-wideband monopole antenna meets the requirements of anti-interference and multifunctionality. It can work in 8 states and has stable gain, good omnidirectional radiation performance, and can freely switch between UWB mode and each notch band mode.
Article
Engineering, Electrical & Electronic
Sahar Saleh, Widad Ismail, Intan Sorfina Zainal Abidin, Moh'd Haizal Jamaluddin, Mohammed H. Bataineh, Asem S. Al-Zoubi
Summary: A new theory called Vivaldi nonuniform slot profile antenna (VNSPA) is proposed to reduce the size of the predesigned compact ultrawide band (UWB) Vivaldi-tapered slot antenna (VTSA) without compromising its performance. The proposed antenna achieves a significant size reduction and maintains similar matching and bandwidth performance compared to VTSA. Experimental results validate the effectiveness of the new theory.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Computer Science, Interdisciplinary Applications
Rohit Mathur, Santanu Dwari
Summary: This paper presents a new compact MIMO antenna design that is frequency and port reconfigurable, featuring four UWB monopole elements that can switch between different frequency states. The concept is validated through simulation and measurement results.
INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
(2021)
Article
Engineering, Electrical & Electronic
Ahmed S. Elkorany, Ghidaa T. Ahmed, Hesham A. Mohamed, Zeinab F. Elsharkawy
Summary: This paper introduces a CPW fed UWB planar monopole antenna with reconfigurable band notch characteristics. The notch frequency of the antenna can be controlled by using varactor diodes. Finite element method is used for simulation and a prototype is fabricated and tested, with good agreement between measurement and simulation results. The proposed antenna suppresses gain in the notch frequency and exhibits directive patterns in the E-plane and omnidirectional patterns in the H-plane.
MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMS
(2021)
Article
Engineering, Electrical & Electronic
Liang Liu, Xianling Liang, Ronghong Jin, Haijun Fan, Xudong Bai, Han Zhou, Junping Geng
Summary: This article introduces a new design approach for wideband transformers with frequency-dependent complex loads, which features easy design, compact size, and wide bandwidth. The validity of the approach is confirmed through simulation and measurement, resulting in high-performance wideband transformers and power dividers.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2021)
Article
Computer Science, Interdisciplinary Applications
Anveshkumar Nella, Sandeep Kiran Vattiprolu, Chinmoy Saha, Jawad Yaseen Siddiqui
Summary: This article presents a frequency reconfigurable 4-port integrated ultra-wideband and narrowband antenna structure for cognitive radio applications. The structure includes four distinct antennas integrated on FR-4 substrate with good performance demonstrated through experimental validation.
INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
(2022)
Article
Engineering, Electrical & Electronic
Jia-Dong Cheng, Bin Xia, Can Xiong, Lin-Sheng Wu, Jun-Fa Mao
Summary: A new on-chip unequal Wilkinson power divider developed on a silicon-based IPD process and parametric model is proposed for sub-6G applications, with a central operating frequency at 4.8 GHz and a fabricated sample size of 1.6 x 2.1 mm². The design process achieves a balance between circuit simulation efficiency and full-wave simulation accuracy, showing good agreement between simulated and measured results.
IEEE MICROWAVE AND WIRELESS COMPONENTS LETTERS
(2022)
Article
Computer Science, Interdisciplinary Applications
Adnan Ghaffar, Xue Jun Li, Wahaj Abbas Awan, Amir Hossein Nazeri, Niamat Hussain, Boon-Chong Seet
Summary: This article introduces a compact multiband, multimode frequency reconfigurable antenna for heterogeneous wireless applications. The antenna features a simple geometrical configuration and offers six different operation modes. It provides acceptable gain, omnidirectional radiation pattern, and high efficiency. The performance of the proposed antenna was validated through fabrication and testing, demonstrating its suitability for modern wireless applications requiring multiband and multimode compact antennas.
INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
(2021)
Article
Mathematics, Interdisciplinary Applications
Arshad Karimbu Vallappil, Bilal A. A. Khawaja, Mohamad Kamal A. Rahim, Muhammad Uzair, Mohsin Jamil, Qasim Awais
Summary: This paper presents the design, simulation, fabrication, and characterization study of a low-cost and directional hybrid four-element Minkowski-Sierpinski fractal antenna array for high-efficiency IEEE 802.11ax WLANs (Wi-Fi 6E) and sub-6 GHz 5G wireless systems. The array operates at dual-band frequencies of 4.17 and 5.97 GHz and provides improved bandwidth, gain, and radiation pattern. The proposed antenna array design is believed to be an ideal candidate for high-efficiency WLANs and upcoming 5G wireless and satellite communication systems.
FRACTAL AND FRACTIONAL
(2023)
Article
Engineering, Electrical & Electronic
Sanjukta Nej, Anumoy Ghosh, Jayendra Kumar, Santanu Das
Summary: This paper presents a UWB dual-element MIMO antenna with reconfigurable band-notched characteristics. The antenna can switch between different band notches, enabling reconfigurable band notches for various frequencies. The antenna also achieves good isolation characteristics and can handle impulse signals.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2023)
Review
Computer Science, Information Systems
Ali Ahmed Salem, Kwan Yiew Lau, Wan Rahiman, Zulkurnain Abdul-Malek, Samir Ahmed Al-Gailani, Nabil Mohammed, R. Abd Rahman, Salem Mgammal Al-Ameri
Summary: In this paper, a systematic review of research on pollution flashover voltage is conducted, analyzing factors affecting insulator performance. By reviewing numerous relevant articles, important insights are provided for evaluating the health of insulators and advancing research on electric power transmission line insulators.
Article
Polymer Science
Ali Ahmed Salem, Kwan Yiew Lau, Zulkurnain Abdul-Malek, Wenbin Zhou, Salem Al-Ameri, Samir A. Al-Gailani, Rahisham Abd Rahman
Summary: This paper presents a unique approach to calculate the electric field distribution over the surfaces of contaminated polymeric insulators based on electrical characteristics observed from measurements. A case study using two different geometric profiles of 33 kV polymeric insulators demonstrates the benefits of the proposed modeling approach. The conductance of the pollution layer is tested to establish a nonlinear field-dependent conductivity for pollution modeling. The electric field and current density distributions along the insulator are computed using the finite element method. The results show that the electric field magnitude on the insulators differs depending on the geometric profiles under high rain and fog conditions.
Article
Engineering, Multidisciplinary
Sahar Saleh, Widad Ismail, Intan Sorfina Zainal Abidin, Moh'd Haizal Jamaluddin, Mohammed H. Bataineh, Asem S. Alzoubi
Summary: By changing the transition shape from Microstrip to Slot line, a compact UWB Vivaldi Tapered Slot Antenna design was achieved. Among the four models analyzed, Model D exhibited significant size reduction and improved performance, with hardware measurements confirming the validity of the proposed antennas.
ALEXANDRIA ENGINEERING JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Ali Ahmed Salem, Kwan Yiew Lau, Zulkurnain Abdul-Malek, Samir A. Al-Gailani, Chee Wei Tan
Summary: This study investigates the impact of various factors on the flashover voltage of an 11 kV porcelain insulator and proposes a hybrid model that can predict the insulator's flashover voltage and condition.
ELECTRIC POWER SYSTEMS RESEARCH
(2022)
Article
Computer Science, Artificial Intelligence
Anas Atef Amaireh, Asem S. Al-Zoubi, Nihad Dib
Summary: This paper proposes a new hybrid algorithm that combines the main features of two well-known metaheuristic algorithms, GOA and ALO. The experimental results show that the proposed algorithm performs well in multiple tests and has significant advantages over other algorithms in some tests.
EVOLUTIONARY INTELLIGENCE
(2023)
Article
Engineering, Electrical & Electronic
Sahar Saleh, Widad Ismail, Intan Sorfina Zainal Abidin, Moh'd Haizal Jamaluddin, Mohammed H. Bataineh, Asem S. Al-Zoubi
Summary: A new theory called Vivaldi nonuniform slot profile antenna (VNSPA) is proposed to reduce the size of the predesigned compact ultrawide band (UWB) Vivaldi-tapered slot antenna (VTSA) without compromising its performance. The proposed antenna achieves a significant size reduction and maintains similar matching and bandwidth performance compared to VTSA. Experimental results validate the effectiveness of the new theory.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Chemistry, Physical
Ali Ahmed Salem, Kwan Yiew Lau, Mohd Taufiq Ishak, Zulkurnain Abdul-Malek, Samir A. Al-Gailani, Salem Mgammal Al-Ameri, Ammar Mohammed, Abdulaziz Ali Saleh Alashbi, Sherif S. M. Ghoneim
Summary: Insulator monitoring using leakage current characteristics is crucial for predicting its health. This study experimentally investigated leakage current indices to assess the risk of flashover on porcelain insulators. The study introduced six indicators based on the time and frequency characteristics of leakage currents to evaluate the insulator's health. The results demonstrated the significant role of these indicators in assessing the insulator's health.
Article
Multidisciplinary Sciences
Ali Ahmed Salem, Kwan Yiew Lau, Wan Rahiman, Zulkurnain Abdul-Malek, Samir A. Al-Gailani, R. Abd Rahman, Salem Al-Ameri
Summary: This study evaluated the health condition of porcelain, glass, and silicone rubber insulators by monitoring leakage current and voltage characteristics. The proposed indicators were found to have an important impact in determining the physical state of the insulators.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Analytical
Irene Kong Cheh Lin, Mohd Haizal Jamaluddin, Abinash Gaya
Summary: In this paper, a triple-band substrate integrated waveguide (SIW) with dielectric resonator antenna (DRA) for 4G and 5G applications is proposed and studied. Loading SIW with DRA enables wide bandwidth, low losses, and easy fabrication. The antenna covers LTE Band 3 at 1.8 GHz, LTE Band 8 at 2.6 GHz, and 5G n77 at 3.7 GHz, allowing for independent data transmission and reception. The antenna achieves high bandwidths, gains, and efficiencies at each frequency band. The simulated and measured results are in good agreement, demonstrating the feasibility of the proposed antenna for 4G and 5G applications.
Article
Chemistry, Multidisciplinary
Siti Nor Hafizah Sa'don, Mohd Haizal Jamaluddin, Muhammad Ramlee Kamarudin, Fauzan Ahmad
Summary: This paper proposes a tunable antenna based on graphene for future wireless communication technology. The antenna is made by graphene/polyimide film and can tune the frequency using thermal. The fabricated antennas are measured for their S-parameter and other characteristics, and the results show successful frequency tuning at different temperatures.
Review
Computer Science, Information Systems
Hamza Ahmad, Mohd Haizal Jamaluddin, Fauziahanim Che Seman, Muhibur Rahman
Summary: This article provides a comprehensive literature review of MIMO dielectric resonator antennas (DRAs) specifically designed for 5G applications. The performance of these designs is discussed in detail, considering parameters such as gain, isolation, size, bandwidth, profile, and radiation characteristics. The primary goal of this work is to highlight the significant progress made in this important research area, as well as identify gaps in the literature and suggest potential directions for future work.
Article
Computer Science, Information Systems
Sahar Saleh, Mohd Haizal Jamaluddin, Bader Alali, Ayman A. Althuwayb
Summary: Compact fifth-generation (5G) low-frequency band filtering antennas with stable directive radiation patterns, improved bandwidth, and gain are designed, fabricated, and tested in this research. The proposed filtennas combines compact 5G third-order uniform and non-uniform transmission line hairpin bandpass filters with the compact ultrawide band Vivaldi tapered slot antenna in one module. Computer simulation technology software is used for the simulation, and good measured S11 and peak realized gains are achieved for the filtennas, outperforming the predesigned filters.
CMC-COMPUTERS MATERIALS & CONTINUA
(2023)
Article
Computer Science, Information Systems
Azuwa Ali, Mohd Najib Mohd Yasin, Ismahayati Adam, Ali H. Rambe, Mohd Haizal Jamaludin, Hasliza A. Rahim, Corhan Cengiz, Mohd Ibrahim Shapiai Abd Razak
Summary: This paper proposes a new design for a dielectric resonator antenna that can generate circularly polarized triple-band signals. The antenna achieves triple-band circular polarization through the use of metal strips on the side of the antenna structure. The design starts with a conventional rectangular dielectric resonator antenna and enhances the metal strips to achieve wider impedance bandwidth. Further improvements are made to the antenna performance by modifying the DRA structure. The proposed antenna demonstrates wide impedance matching bandwidth and broadband circular polarization.
CMC-COMPUTERS MATERIALS & CONTINUA
(2023)
Article
Computer Science, Information Systems
M. Inam, M. H. Dahri, M. R. Kamarudin, A. Y. Ashyap, M. H. Jamaluddin, N. H. Sulaiman, M. A. Khan, Z. A. Shamsan, K. Almuhanna, F. Alorifi
Summary: This work presents the design and analysis of a single layer, linearly polarized millimeter wave reflectarray antenna with mutual coupling optimization. The proposed reflectarray antenna demonstrates good performance, making it a potential candidate for modern applications such as 5G and 6G communication systems.
CMC-COMPUTERS MATERIALS & CONTINUA
(2022)
Article
Computer Science, Information Systems
Abinash Gaya, Mohd. Haizal Jamaluddin, Ayman A. Althuwayb
Summary: An ultra-wideband rectangular Dielectric Resonator Antenna designed for millimeter wave 5G frequency band applications in this article achieved a bandwidth of 20.15% and an efficiency of 96%, making it suitable for 5G indoor communications with a resonating frequency centered at 26 GHz.
CMC-COMPUTERS MATERIALS & CONTINUA
(2022)
