Article
Engineering, Electrical & Electronic
Shafaq Kausar, A. U. Kausar, Muhammad Usman Hadi, Hani Mehrpouyan
Summary: This paper presents the design of a high gain multi-beam transmitarray antenna, which is capable of independently steering multiple beams in the azimuth and elevation plane. By using a passive meta-surface, the antenna achieves continuous beam steering by adjusting the phase of the unit cell transmission coefficient. The designed antenna is low cost, robust, and suitable for satellite communication and mm-Wave 5G systems.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2024)
Article
Engineering, Electrical & Electronic
Zhao Yang, Guangjun Wen, Wei Hu, Daniele Inserra, Yongjun Huang, Jian Li
Summary: The research team successfully generated an Airy beam at microwave frequencies using arrays with microstrip patch antenna elements, with experiment results showing a good performance within a specific frequency range.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Weixu Yang, Ke Chen, Xinyao Luo, Kai Qu, Junming Zhao, Tian Jiang, Yijun Feng
Summary: A novel high-efficiency polarization-selective bifunctional metasurface has been proposed, which can selectively manipulate left-handed and right-handed circularly polarized light. Through numerical simulations and experiments, it has been shown that the proposed metasurface can be applied to high-gain antennas in millimeter-wave communication systems.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Fan Qin, Rui Song, Wenchi Cheng, Hailin Zhang
Summary: The multibeam transmitarray carrying orbital angular momentum (OAM) was introduced in the letter to achieve 1-D +/-30 degrees beam coverage. A three-layer unit cell design was utilized for high-efficiency transmission and 360 degrees phase coverage, with stable vortex property and high mode purity achieved in a five-beam prototype.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Denys Nikolayev, Anja K. Skrivervik, John S. Ho, Maxim Zhadobov, Ronan Sauleau
Summary: Efficient and robust in-body antenna designs are crucial for the development of wireless in-body bioelectronics. This study proposes a pattern- and frequency-reconfigurable capsule-conformal antenna array that addresses the challenges of next-generation in-body bioelectronics, and experimental results validate its effectiveness.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Lehu Wen, Steven Gao, Qi Luo, Wei Hu, Benito Sanz-Izquierdo, Chao Wang, Xue-Xia Yang
Summary: A wideband transmitarray (TA) antenna using compact 2-bit filtering unit cells is presented, which features wide bandwidth, compact aperture size, filtering radiation performance, and low cross-polarization levels.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Huanhuan Yang, Tong Li, Liming Xu, Xiangyu Cao, Liaori Jidi, Zexu Guo, Pei Li, Jun Gao
Summary: This article presents a novel design strategy for reducing radar cross section (RCS) in the working band of antennas, using a combination of metasurface and antenna design to achieve low in-band RCS for microstrip patch antennas. The design also includes a frequency reconfigurable antenna derived from the radiation and scattering mechanism of the novel antenna, with a 4x4 array developed to achieve in-band RCS reduction while maintaining radiation performance. Experimental results confirm the effectiveness of the proposed strategy.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Lin Hai Xu, Yu Qing Guo, Peng Fei Hu, Kwok Wa Leung, Yong Mei Pan
Summary: A broadband, series-fed, millimeter-wave microstrip linear array is studied. By inserting three pairs of shorting pins at the two ends of the microstrip line, additional resonances are excited, significantly increasing the operating bandwidth. The proposed array has advantages such as a simple structure, enhanced bandwidth, and good sidelobe suppression.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Vanine Sabino, Daniel B. Ferreira, Odilon M. C. Pereira-Filho, Luiz C. da Silva
Summary: This paper presents a method-of-moment solution for a conical-rectangular microstrip antenna using volume formulation and eigenfunction expansion of Dirac's delta function. The results for input impedance and radiation patterns are compared to those obtained from HFSS software, showing a good match.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Jiaxuan Liang, Tingyin Ning, Jiayu Fan, Zhiyong Wu, Min Zhang, Hong Su, Yu-Jia Zeng, Huawei Liang
Summary: The research proposes metallic waveguide transmiarray antennas (MWTAs) capable of generating multibeams with high gain and optional polarized states through simultaneous control of phase and polarization. Experimental results demonstrate promising performance for communication applications in the terahertz and millimeter wave bands.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Shi-Gang Fang, Shi-Wei Qu, Shiwen Yang, Xiao-Qiu Li, Hong-Bing Sun, Zhi-Peng Zhou
Summary: In this study, a grooved metal ground with slits is used to reduce the scattering cross section of a microstrip patch array antenna. By arranging grooves and slits on the ground, phase differences in scattering between the elements on the ground and in the grooves are achieved on the aperture, resulting in significant reduction in SCS over a broadband range.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2021)
Article
Engineering, Electrical & Electronic
Hanguang Liao, Atif Shamim
Summary: In this letter, a high-aperture-efficiency (eta(AP)), right-hand circularly polarized (RHCP), sequentially rotated hexagonal microstrip antenna array for GPS L1 band is proposed. The antenna design is placed on a hexagonal top of a floating sensor node for ocean and marine monitoring applications. The design effectively utilizes the hexagonal area and maximizes the aperture efficiency by distributing centrosymmetric CP microstrip antenna elements on the hexagonal substrate.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2022)
Article
Computer Science, Information Systems
Xinyan Yang, Xianfeng Liu
Summary: A novel wide-beam microstrip patch array antenna is proposed for automotive radar applications in this paper. By introducing the coupled-mode technology, the antenna design achieves an inclined unit radiation beam. The array elements are arranged alternately and in opposite phases to simultaneously realize wide-beam characteristics and high gain performance, showing great potential in automotive radar.
Review
Computer Science, Information Systems
Nima Javanbakht, Barry Syrett, Rony E. Amaya, Jafar Shaker
Summary: This paper presents a comprehensive survey of reconfigurable leaky-wave antennas (LWAs), focusing on their beam-steering and unique radiating features. Different types of LWAs and their radiation mechanisms are discussed in detail, along with the guiding structures for realizing LWAs. The study also introduces basic concepts of electronic beam-scanning LWAs and investigates state-of-the-art reconfigurable LWAs suitable for beam-scanning applications.
Article
Engineering, Electrical & Electronic
Meini Wang, Min Tang, Le Peng Zhang, Hao Chi Zhang, Jie Xu, Tie Jun Cui, Junfa Mao
Summary: By utilizing planar periodic slow-wave structure (PSWS), the miniaturization of frequency-reconfigurable antennas is achieved with controlled dispersion features. The operating frequency can be electronically adjusted by varactors, making it suitable for ultra-compact frequency hopping communication systems.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Gengyu Xu, Sean Victor Hum, George Eleftheriades
Summary: A new topology for printed circuit board metagratings (MGs) has been proposed to manipulate electromagnetic waves at microwave frequencies by interleaving two single-band segmented gratings (SGs). The composite device is capable of dual-band operation without the two frequencies needing to be harmonically related, and the SGs are shielded from each other through inclusion of via fences to suppress near-field coupling.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Elham Baladi, Sean Victor Hum
Summary: This work presents a fully analytical method for obtaining equivalent circuit models that predict the magnitude and phase of scattering parameters for reflectarray and/or metasurface unit cells. The proposed method is derived from a Floquet modal expansion of surface currents and does not rely on full-wave simulations, providing a fast and efficient design tool.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Zhengzheng Wang, Sean Hum
Summary: A new model-based parameter estimation (MBPE) method for multilayer periodic EM surfaces is discussed, which can accurately capture the behavior of each unit layer section and estimate the broadband response of periodic structures in a robust and efficient manner. Numerical analysis shows good agreement between the proposed method and the conventional periodic method of moments (PMM).
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Parinaz Naseri, Sean Hum
Summary: This article introduces a machine learning-based approach to automate the design of dual- and triple-layer metasurfaces, solving the difficulties encountered in traditional synthesis methods. This method allows for the synthesis of thin structures with specific scattering properties, applied in various metasurface applications.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Gengyu Xu, George Eleftheriades, Sean Victor Hum
Summary: An accurate equivalent circuit model (ECM) for general multiwire multiorder printed circuit board (PCB) metagratings (MGs) is developed, with effective impedances of grating wires modeled as lumped loads. Numerous propagating Floquet harmonics are modeled as circuit ports, and a set of required scattering parameters for the ECM is derived based on desired field transformation for the MG. Optimizing equivalent lumped loads allows encoding multiple functions into a single device, enabling the design and investigation of angle-multiplexed multifunctional MGs.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Engineering, Electrical & Electronic
Reza Gholami, Parinaz Nasen, Piero Triverio, Sean Victor Hum
Summary: This article presents a generalized macromodeling approach to simulate complex electromagnetic surfaces, generating macromodels of unit cells by applying the equivalence principle. A new method is proposed to ensure the continuity of surface currents, with accuracy validated through comparisons with commercial solvers for different EM surfaces.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Stewart Pearson, Sean Victor Hum
Summary: This article introduces a new optimization scheme for determining surface parameters to satisfy far-field constraints such as beam level, sidelobe level, and null locations. Through this optimization scheme, multicriteria pattern forming, extreme angle small surface refraction, and Chebyshev-like beamforming can be achieved.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Parinaz Naseri, Stewart Pearson, Zhengzheng Wang, Sean Hum
Summary: This article proposes an efficient approach for the design of electromagnetic metasurfaces based on far-field constraints. The approach allows the designer to input high-level constraints and returns a design that satisfies these constraints. The method utilizes optimization and machine-learning techniques to determine the required surface parameters. Two examples are provided to demonstrate the effectiveness of the approach.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Multidisciplinary Sciences
Parinaz Naseri, George Goussetis, Nelson J. G. Fonseca, Sean Hum
Summary: This paper proposes a data-driven approach integrated with a generative adversarial network for the design of electromagnetic linear-to-circular polarization converters. The method successfully synthesizes dual-band and triple-band reflective polarizers with stable performance and validates their feasibility and performance through experiments.
SCIENTIFIC REPORTS
(2022)
Article
Engineering, Electrical & Electronic
Elham Baladi, Gursimran Singh Sethi, Herve Legay, Sean Victor Hum
Summary: This work presents a low-profile center-fed leaky-wave antenna (LWA) that combines the full-space beam-scanning capabilities of transmitarrays and the low-profile nature of LWAs. A true-time-delay (TTD) phase-shifting mechanism is used to achieve a phase range of more than 540°. The proposed antenna consists of a 2564-element array that generates a pencil beam that can be steered to arbitrary angles.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Beichen Duan, Erin R. Bobicki, Sean Victor Hum
Summary: This study investigates the potential application of microwave imaging in ore sorting systems and demonstrates its feasibility in separating valuable minerals or metals from ores.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Parinaz Naseri, George Goussetis, Nelson J. G. Fonseca, Sean Hum
Summary: This paper utilizes a machine-learning technique called generative adversarial network (GAN) to explore and exploit the solution space of reflective linear-to-circular polarization (LP-to-CP) converters. By optimizing the shape of the polarizing element, the proposed designs achieve superior performance in terms of overlapping axial ratio bandwidth for normal and oblique incidence of 30 degrees compared to previously studied designs.
2022 16TH EUROPEAN CONFERENCE ON ANTENNAS AND PROPAGATION (EUCAP)
(2022)
Article
Engineering, Electrical & Electronic
Gengyu Xu, George V. Eleftheriades, Sean Victor Hum
Summary: This paper presents a simple reconfigurable leaky-wave antenna (LWA) and an efficient optimization procedure for shaping its radiation pattern. The antenna is capable of meeting various requirements, such as wide-angle continuous beam-scanning and strong side lobe suppression. Importantly, it can adaptively tune the antenna input impedance to match the source without the need for a complicated matching network.
IEEE OPEN JOURNAL OF ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Stewart Pearson, Parinaz Naseri, Sean V. Hum
Summary: Electromagnetic metasurfaces have attracted attention due to their low profile and advantageous applications, but the design process is challenging and requires macroscopic and microscopic design steps. Through iterative optimization and machine learning surrogate models, successful realization of surface properties with far-field patterns compliant with constraints has been achieved.
IEEE OPEN JOURNAL OF ANTENNAS AND PROPAGATION
(2022)
Article
Computer Science, Information Systems
Gengyu Xu, Vasileios G. Ataloglou, Sean Victor Hum, George Eleftheriades
Summary: This study presents an end-to-end design of compact and low-loss metasurface antennas with integrated feeds. The antennas are implemented with a single-layered reactive impedance metasurface on top of a grounded dielectric substrate, and are fed by embedded sources. An accurate model is developed for rapid optimization of the wire impedances, leading to desired radiation characteristics and extreme field transformations. The design framework also includes feasibility-related constraints for enhanced power efficiency and bandwidth. The study demonstrates the capabilities of the design framework through the realization of wide-angle beamforming and multi-input, multi-output antennas with high aperture efficiency.