Review
Chemistry, Multidisciplinary
Mircea Dragoman, Martino Aldrigo, Adrian Dinescu, Dan Vasilache, Sergiu Iordanescu, Daniela Dragoman
Summary: This manuscript provides an overview of the implications of nanomaterials in harvesting ambient electromagnetic waves. It highlights the use of oxides, carbon nanotubes, graphene, and molybdenum disulfide as the most advanced electromagnetic harvesting devices due to their unique physical properties. These nanomaterials have the potential to revolutionize the harvesting of energy from the Sun, heat, or the Earth itself in the future.
Article
Engineering, Electrical & Electronic
Mohammad M. Fakharian
Summary: This article introduces a dynamically switchable ultra-wideband planar monopole antenna, capable of operating in two modes. By using a PIN diode as the switching element, frequency switching is achieved. Additionally, the antenna can dynamically switch between different modes through the detection of RF signals.
INTERNATIONAL JOURNAL OF MICROWAVE AND WIRELESS TECHNOLOGIES
(2021)
Article
Engineering, Electrical & Electronic
Ping Lu, Chaoyun Song, Ka Ma Huang
Summary: This paper proposes an ultra-wideband rectenna with a novel wideband complementary matching stub, utilizing an LC series-parallel resonant circuit as the resonant structure for achieving a wide frequency range matching effect. The rectenna demonstrates good matching performance and high RF-dc conversion efficiency over a wide frequency range from 0.9 to 3 GHz, with a maximum efficiency of 73.4% at 3-dBm input power. The resonant structure-based matching scheme is a promising and effective solution for UWB rectenna design with stably high efficiency across a very wide frequency band.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2021)
Article
Computer Science, Information Systems
Mohamed M. Mansour, Shota Torigoe, Shuya Yamamoto, Haruichi Kanaya
Summary: This work introduces a high-efficiency, high sensitivity, compact rectifier based on a dual-band impedance matching network for sub-1 GHz license-free applications. The rectifier design optimized for operation at sub-GHz frequency bands (0.9 to 2.4 GHz) achieves a conversion efficiency above 45% with a peak efficiency of 70% at the higher band. Potential applications for wireless RF energy harvesting are highlighted due to the simple design and integration with microwave circuits.
Article
Chemistry, Analytical
Xiaoqiang Liu, Mingxue Li, Xinkai Chen, Yiheng Zhao, Liyi Xiao, Yufeng Zhang
Summary: This paper presents a compact RF energy harvesting wireless sensor node with integrated antenna, rectifier, energy management circuits, and load on a single printed circuit board. It achieves efficient energy management and has a small size.
Article
Chemistry, Analytical
Ognadon Assogba, Abdoul Karim Mbodji, Arnaud Breard, Abdou Karim Diallo, Yvan Duroc
Summary: This article presents a new electromagnetic energy harvesting device, a tri-band rectenna, which is versatile and efficient. It is compatible with widely deployed radio frequency standards and offers good performance in low power and different load conditions.
Article
Chemistry, Analytical
Xiaoqiang Liu, Mingxue Li, Xinkai Chen, Yiheng Zhao, Liyi Xiao, Yufeng Zhang
Summary: This paper presents a compact stacked RF energy harvester operating in the WiFi band with multi-condition adaptive energy management circuits. The proposed harvester demonstrates efficient energy conversion and can drive various devices at different distances using a home router as the transmitting source.
Article
Computer Science, Information Systems
Abhishek Kumar, Pramod Sing Rathore, Ashutosh Kumar Dubey, Rashmi Agrawal, Kanta Prasad Sharma
Summary: Increased use of ultra-wideband (UWB) in wireless body area networks (WBAN) provides various options for biomedical research, such as continuous health monitoring of patients. This study focuses on the hybridization of UWB technology and explores on-body, off-body, and human-body ultra-wideband communication (HB-UWB). Through considering parameters like throughput, energy consumption, and delay, an improved power-saving UWB-WBAN design and assessment model is proposed. A low-power traffic-aware emergency-based narrowband protocol (LTE-NBP) is introduced to address issues related to emergency data transmission and power consumption in UWB-WBAN. The proposed model shows improved performance in terms of throughput, energy efficiency, and delay compared to existing algorithms.
MULTIMEDIA TOOLS AND APPLICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Yong Xia, Xiaowei Shi
Summary: In this paper, a new perspective on the function of Schottky barrier diode (SBD) in microwave rectifying circuit is proposed. The existing theoretical system in the field of analog circuits forms the basis for subsequent rectifier design schemes. It is argued that the SBD in the microwave rectifying circuit does not exhibit one-directional conductivity as observed in analog circuits, raising doubts about the previous rectification theory. The key reason for the DC output power in the rectifying circuit is found to be the DC component generated at the front end of SBD due to the interaction with the microstrip line, revealing a completely different mechanism of DC generation. Accurate understanding of the function of SBD in microwave rectifying circuit will aid in its proper utilization and circuit design in future applications.
INTERNATIONAL JOURNAL OF ANTENNAS AND PROPAGATION
(2023)
Review
Chemistry, Physical
Ivona Z. Mitrovic, Saeed Almalki, Serdar B. Tekin, Naser Sedghi, Paul R. Chalker, Stephen Hall
Summary: The quest for utilizing untapped renewable infrared energy sources has spurred significant research efforts into designing, fabricating, and optimizing a self-biased rectenna that operates without external bias voltage. The focus is on the metal insulator metal (MIM) diode, which has fast response time due to femtosecond tunneling process governing current transport. Fabrication of single, double, and triple insulator MIM diodes have been reviewed, with attention to key figures of merit like zero-bias responsivity and zero-bias dynamic resistance. Various oxide combinations have been explored, with sub-nanometer accuracy in oxide stoichiometry and thicknesses seen to optimize responsivity and resistance in advanced rectennas.
Article
Engineering, Electrical & Electronic
Yong Xia, Xiaowei Shi
Summary: Resistance compression networks (RCNs) have been widely studied in wireless power transmission (WPT) for increasing conversion efficiency. Various rectifiers with RCN have been proposed in different circuit and physical forms. This paper deeply investigates RCN and its modified versions, as well as analyzing the related rectifiers. The results show that RCN only acts as a bandpass filter (BPF) in the rectifying circuit, contrary to the original idea of the first proposer. Different interpretations of rectifying circuits presented in other papers are observed.
INTERNATIONAL JOURNAL OF ANTENNAS AND PROPAGATION
(2023)
Article
Nanoscience & Nanotechnology
Amina Belkadi, Ayendra Weerakkody, Gregor Lasser, Garret Moddel
Summary: Thermoradiative devices can convert low-temperature waste heat to electricity by utilizing infrared rectennas for power generation at room temperature. These devices require high diode conversion efficiency, high coupling efficiency between diode and antenna, and a large array of devices.
Article
Engineering, Electrical & Electronic
Sarath Sankar Vinnakota, Runa Kumari, Basudev Majumder
Summary: This study explores a cost-effective dual-polarized broadband dipole antenna for RF energy harvesting. The 2 x 2 antenna arrangement over an artificial magnetic conductor surface allows for capturing RF energy from both horizontal and vertical polarizations in a multiple-input-multiple-output environment. The antenna is integrated with a single-series rectifier circuit to power an LED, demonstrating the process of capturing RF energy.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Multidisciplinary Sciences
Surajo Muhammad, Mohamed Ibrahim Waly, Nasser Ali AlJarallah, Ridha Ghayoula, Ahmed S. Negm, Amor Smida, Amjad Iqbal, Jun Jiat Tiang, Mardeni Roslee
Summary: This paper presents a four-band implantable RF rectifier with simplified circuit complexity. The proposed rectifier can harvest RF signals at multiple frequencies and achieves high RF-to-DC power conversion efficiency. It demonstrates the potential for powering low-power biomedical implantable devices by effectively utilizing the frequency domain.
SCIENTIFIC REPORTS
(2023)
Review
Construction & Building Technology
Haytham Musameh, Hameed Alrashidi, Faris Al-Neami, Walid Issa
Summary: This work reviews the recent advancement in semi-transparent photovoltaics (STPV) glazing systems and investigates their impact on energy consumption in buildings through numerical simulation. The results indicate that employing clear double-glazing in small glazing situations can significantly reduce energy consumption, while applying STPV glazing systems in large glazing can lead to a decrease in energy performance. The effectiveness of STPV glazing systems in medium-sized glazing installations depends on the solar material used.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Telecommunications
Shariq Mahmood Khan, R. Nilavalan, Abdulhafid F. Sallama
WIRELESS PERSONAL COMMUNICATIONS
(2015)
Article
Instruments & Instrumentation
S. Majidnia, R. Nilavalan, J. Rudlin
Article
Engineering, Electrical & Electronic
Alaa H. Radhi, R. Nilavalan, Yi Wang, H. S. Al-Raweshidy, Amira A. Eltokhy, Nur Ab Aziz
INTERNATIONAL JOURNAL OF MICROWAVE AND WIRELESS TECHNOLOGIES
(2018)
Article
Engineering, Electrical & Electronic
Mohammadreza Behjati, John Paul Cosmas, Rajagopal Nilavalan, Giuseppe Araniti, Massimo Condoluci
IET SCIENCE MEASUREMENT & TECHNOLOGY
(2014)
Article
Instruments & Instrumentation
S. Majidnia, C. Schneider, J. Rudlin, R. Nilavalan
Article
Instruments & Instrumentation
S. Majidnia, J. Rudlin, R. Nilavalan
Article
Engineering, Electrical & Electronic
Alaa H. Radhi, Rajagopal Nilavalan, Yi Wang, Hamed Al-Raweshidy, Amira A. Eltokhy, Nur Ab Aziz
IET MICROWAVES ANTENNAS & PROPAGATION
(2019)
Article
Engineering, Electrical & Electronic
Geoffrey Eappen, T. Shankar, Rajagopal Nilavalan
Summary: The paper proposed an Advanced Squirrel Algorithm (ASA)-trained neural network (NN) for efficient spectrum sensing in air traffic control applications. The proposed ASA-NN showed a high convergence rate in detecting spectrum holes compared to existing metaheuristic-based NN training algorithms.
IET COMMUNICATIONS
(2021)
Article
Computer Science, Artificial Intelligence
Geoffrey Eappen, T. Shankar, Rajagopal Nilavalan
Summary: The paper introduces a Cognitive Radio (CR) technology based relay network to address spectrum overcrowding and network blockage issues. It proposes a novel mutated Modified Whale Optimization Algorithm (MWOA) trained Spiking Neural Network (SNN) based spectrum sensing technique to efficiently detect spectrum holes. The proposed scheme shows state-of-the-art performance in detecting spectrum holes, improving User Equipment (UE) performance in network blockage areas.
APPLIED SOFT COMPUTING
(2022)
Article
Engineering, Electrical & Electronic
Geoffrey Eappen, John Cosmas, T. Shankar, A. Rajesh, Rajagopal Nilavalan, Joji Thomas
Summary: In this paper, a deep learning integrated reinforcement learning algorithm is proposed for intelligent beamforming in B5G networks. The algorithm achieves better performance in terms of signal to noise ratio and accuracy compared to traditional methods, thanks to the combination of reinforcement learning and deep neural networks.
IET COMMUNICATIONS
(2022)
Review
Engineering, Electrical & Electronic
Inas Sawad, Rajagopal Nilavalan, Hamed Al-Raweshidy
Summary: This paper discusses the challenges facing operators, investors, and providers when introducing 5G technology to developing countries. The main focus is on the 5G transport network, particularly the backhaul network. The architectural options and scenarios for the 5G transport network are discussed based on standards and previous studies, and potential new technologies to address the challenges of existing infrastructure in developing countries are considered.
IET COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Song Qiu, Robert Allan, Rajagopal Nilavalan, Jeff Ivey, Steven Butterfield, Maozhen Li
Summary: This study proposes a fail-safe wireless communication architecture for Internet of Things based fire alarm control panels, which is verified to have low latency and high reliability through experiments, and suggests its feasibility for future application in IoT fire safety products.
SN APPLIED SCIENCES
(2021)
Proceedings Paper
Computer Science, Artificial Intelligence
A. Anhar, R. Nilavalan
INTELLIGENT COMPUTING, VOL 2
(2019)
Article
Engineering, Multidisciplinary
Siva Kumar Subramaniam, Shariq Mahmood Khan, Anhar Titik, Rajagopal Nilavalan
IIUM ENGINEERING JOURNAL
(2018)
