Article
Astronomy & Astrophysics
J. M. Gil
Summary: This paper presents a method for designing ultra-short conical horns corrected by lenses. The method takes advantage of the axisymmetric character of the horns, reducing computational time and facilitating optimization. By adding a double convex lens and a dielectric core to the antenna, compact and shortened horns with good performance can be achieved.
Article
Engineering, Electrical & Electronic
Duc Anh Pham, Minjae Lee, Sungjoon Lim
Summary: A high-gain planar antenna with a conical beam is proposed for millimeter-wave drone applications, achieved by utilizing in-phase reflections from planar annular-distributed side reflectors. Numerical and experimental demonstrations show high peak gain, radiation efficiency and impedance bandwidth in the frequency range.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Chemistry, Multidisciplinary
Ali H. Alqahtani, Yosef T. Aladadi, Mohammed T. Alresheedi
Summary: This paper proposes a dielectric slabs-based lens for millimeter-wave beamforming systems. The lens consists of multiple dielectric slabs with matching gradient effective refractive index, same thicknesses, and different radii, used for millimeter-wave beamforming applications.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Electrical & Electronic
Yujiao Guo, Yujian Li, Junhong Wang, Lei Ge, Zhan Zhang, Meie Chen, Zheng Li, Bo Ai, Ruisi He
Summary: A three-dimensional printed Luneburg lens with nearly isotropic properties is proposed in this paper. The new printable spherical lens geometry, constructed using a cubical-lattice-type and rod-type gradient-index materials, significantly improves the antenna radiation characteristics. Experimental results demonstrate that the lens antenna can generate a dual-polarized radiation beam that can steer in a wide angular range with stable performance.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Abdolmehdi Dadgarpour, Marco A. Antoniades, Abdel-Razik Sebak, Tayeb A. Denidni
Summary: A 2-D beam switching dipole antenna working at 60 GHz is proposed, which uses folded electric-field coupled resonators to achieve high-refractive-index medium, forming metalenses in different planes to manipulate the beam direction.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Ralph M. van Schelven, Waqas H. Syed, Giorgio Carluccio, Kostas Doris, Anton de Graauw, Andrea Neto, Daniele Cavallo
Summary: In this work, we investigate antenna architectures for dual-mode operation in phased array designs. Planar slot antenna elements are used in array configuration, along with artificial dielectric layers (ADLs) in close proximity, to achieve pattern shaping. The artificial dielectric superstrate supports leaky wave propagation that can be optimized to enhance gain in a specific angular region or expand the array's field of view. By controlling the amplitude and phase of the antenna elements, radiation patterns can be combined to realize either wide or narrow beams. This concept presents advantages for both mm-wave communication and radar applications. A four-element array design fabricated in standard printed circuit board (PCB) technology validates the feasibility of dual-mode operation, with measured results showing good agreement with simulations.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Shiyu Zhang, Pai Liu, William Whittow
Summary: The hybrid FZL design combines grooved and perforated design methods, improving antenna gain and addressing shadow blockage issues. The design utilizes perforated method for inner regions and grooved method for outer regions, successfully achieving manufacturing of low refractive index regions.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2022)
Article
Materials Science, Characterization & Testing
Norikazu Fuse, Maya Mizuno
Summary: The monopole antenna with a semi-spherical silicon lens effectively suppressed the diffusion of millimeter waves and was used for underfilm corrosion imaging. Reflection properties of gamma-FeOOH tablets were investigated at 33.1 GHz, showing precise delays in the presence of the tablet. Clear delays were measured for an accelerated aging sample, successfully realizing a corrosion map under the coatings.
NDT & E INTERNATIONAL
(2021)
Article
Computer Science, Information Systems
Salvador Moreno-Rodriguez, Miguel A. Balmaseda-Marquez, Javier Carmona-Murillo, Angel Palomares-Caballero
Summary: This article presents a 3-D printed Fresnel-lens antenna made of dielectric unit cells that are insensitive to polarization. The design allows for implementation in any azimuth orientation, simplifying the design process and providing robustness under different conditions. The prototype showed good agreement with the simulations, with a measured gain of 26.5 +/- 0.5 dBi and mean antenna efficiency of 79% from 55 GHz to 65 GHz.
Article
Engineering, Electrical & Electronic
Koji Kudo, Keita Morimoto, Akito Iguchi, Yasuhide Tsuji, Tatsuya Kashiwa
Summary: Recent studies have focused on exploring novel and higher performance microwave and optical devices using optimal design approaches. This article applies a design approach based on Bayesian optimization to design a dielectric flat lens efficiently searching optimal values of design variables.
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2021)
Article
Engineering, Electrical & Electronic
T. Mota Frutuoso, P. Sideris, J. Lugo-Alvarez, X. Garros, L. Brunet, C. Fenouille-Beranger, P. Batude, C. Theodorou, P. Ferrari, F. Gaillard
Summary: Research on RF performance and intertier coupling of CMOS processed in 3-D sequential integration shows that low temperature processes lead to better RF characteristics and improved intertier coupling effects compared to high temperature processes above 1000 degrees Celsius.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Article
Engineering, Electrical & Electronic
Ian Goode, Carlos E. Saavedra
Summary: A fluidically reconfigurable millimeter-wave-lensed antenna is described in this study, with a modified design for beam-steering capability. Experimental results demonstrate good performance at 32 GHz and 35 GHz frequency bands.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2021)
Article
Chemistry, Multidisciplinary
Tarek S. Abdou, Rola Saad, Salam K. Khamas
Summary: This paper introduces a novel 28 GHz circularly polarized rectangular dielectric-resonator antenna (DRA) array for off-body millimeter-wave (mmWave) applications. The rectangular DRA design utilizes a feed network with cross slots to achieve circular polarization. The dimensions of the DRA were (0.48 lambda(o) x 0.48 lambda(o) x 0.27 lambda(o)) at 28 GHz, based on the free-space wavelength. Dielectric layers with human body equivalent parameters were incorporated in the antenna array simulation for off-body communications at 28 GHz.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Electrical & Electronic
Hayoung Hong, Hongsoo Park, Kanghyeok Lee, Wonwoo Lee, Semin Jo, Junhyuk Yang, Changkun Park, Hojin Lee, Sun K. Hong
Summary: The proposed retrodirective beamforming system based on a Rotman lens for far-field wireless power transfer at Ka-band demonstrates wideband operation and the ability to generate nine discrete beams using PCB technology. The system utilizes the true-time-delay property of the Rotman lens and shows promising performance in simulated and measured results.
JOURNAL OF ELECTROMAGNETIC ENGINEERING AND SCIENCE
(2021)
Article
Engineering, Electrical & Electronic
Sabin Kumar Karki, Juha Ala-Laurinaho, Ville Viikari
Summary: This article presents a low-profile, efficient, and scanloss-reduced integrated metal-lens antenna (IMLA). By tilting the radiation pattern of the feed and using asymmetrical dielectric pins, the scan loss of the IMLA is reduced, resulting in high radiation efficiency and gain.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Nicolas Mezieres, Laurent Le Coq, Benjamin Fuchs
Summary: The phaseless characterization of antennas helps reduce the cost and simplify the measurement of radiating systems, particularly at high frequencies. By using appropriate phase retrieval algorithms, the complex near field can be retrieved from the acquisition of the antenna radiated field magnitude only. A two-scan approach combined with Gerchberg-Saxton algorithm has been proven to lead to accurate phase retrievals, and a new strategy of measuring the field magnitude on a single sphere for two antenna positions is proposed for easier implementation in various measurement setups.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Orestis Koutsos, Francesco Foglia Manzillo, Antonio Clemente, Ronan Sauleau
Summary: A novel approach for studying and designing low-cost anisotropic transmitarrays (TAs) at sub-THz frequencies is presented. The array consists of three metal layers and two interleaved dielectric spacers, and a four-port equivalent circuit model is derived to accurately model the anisotropic behavior of the unit cell (UC). The results demonstrate the effectiveness of the design methodology even under strict technological constraints.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Xuanfeng Tong, Zhi Hao Jiang, Yuan Li, Fan Wu, Ronan Sauleau, Wei Hong
Summary: This paper presents the design and experiments of a dual-wideband dual-circularly polarized shared-aperture reflectarray, operating at the K-/Ka-band using a single functional substrate. Wideband performance is achieved by coupling the adjacent resonances of the aperture and patch and utilizing shorted microstrip phase delay lines. The reflectarray cells can independently control the reflective phase delay of orthogonal CP beams at both frequency bands, providing four degrees of freedom for beamforming. The wideband performance of the proposed cells is verified through the investigation of an infinite periodic gradient array.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
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
Xuanfeng Tong, Zhi Hao Jiang, Hao Chen, Fan Wu, Jingyang Cao, Ronan Sauleau, Wei Hong
Summary: In this paper, a dual-circularly polarized multibeam transmit-array antenna is proposed using anisotropic impedance surfaces and hybrid phase compensation strategy. The antenna array consists of eight planarized transmit-array cells with constant dynamic phase difference and Berry phase determined rotation angles. The measured results show that the antenna generates eight RHCP beams and eight LHCP beams with high peak gain values and low axial ratio.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Francois Doucet, Nelson J. G. Fonseca, Etienne Girard, Xavier Morvan, Ronan Sauleau
Summary: This letter proposes a compact planar beamformer design using multiple shaped continuous parallel-plate waveguide delay lenses. By introducing additional ridges and cavities and reducing the longitudinal dimension, the height of the beamformer is significantly reduced while maintaining good focusing properties. A prototype has been manufactured and tested, demonstrating successful two-dimensional beamforming capabilities.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Erdem Cil, Icaro V. Soares, David Renaudeau, Ronan Lucas, Sema Dumanli, Ronan Sauleau, Denys Nikolayev
Summary: This study investigates the possibility of using impedance detuning to detect the location of a capsule in the gastrointestinal tract. Antennas operating in the 433 MHz band are designed and validated through simulations and measurements. In the experimental model, a minimum phase change of around 10° was found, providing sufficient information to track the capsule's position in the GI tract.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Computer Science, Information Systems
Nicola Bartolomei, Darwin Blanco, Francois Doucet, Etienne Girard, Herve Legay, Nelson J. G. Fonseca, Ronan Sauleau, Mauro Ettorre
Summary: This work presents a full metal circularly-polarized lens-like antenna for Satcom applications at Ka-band. The antenna provides multi-beam coverage over a large field of view in the azimuthal plane, while maintaining a relatively simple mechanical design. The antenna system provides 14 beams with alternating right/left handed circular polarization (RHCP/LHCP) with an axial ratio (AR) below 3 Db over an angular range of +/- 19 degrees in the uplink of Ka-Band.
Article
Engineering, Electrical & Electronic
Adham Mahmoud, Jorge Ruiz-Garcia, Olivier de Sagazan, Mauro Ettorre, Ronan Sauleau, David Gonzalez-Ovejero
Summary: This article presents the use of a Luneburg lens to excite a leaky-wave antenna in the sub-THz frequency range. The antenna is fabricated on a 140-mu m thick cyclic Olefin copolymer substrate, with radiating slots etched on the polymer using photolithography. Experimental results show good input reflection coefficient and beam steering capability. The proposed solution offers a low-cost and low-profile alternative for beam-scanning antennas in the sub-THz range.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Nicolas Mezieres, Laurent Le Coq
Summary: The phaseless characterization of antennas allows for reduced measurement efforts, but both magnitude and phase information are necessary for reconstructing the 3-D radiation pattern. The two scans technique enables accurate phase retrieval from magnitude-only measurements. In this study, a Gerchberg-Saxton algorithm is used for phase retrieval in a two concentric spheres setup. A filtering approach is proposed to mitigate convergence problems, and its efficiency is demonstrated through simulations and experimental data.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Xuanfeng Tong, Zhi Hao Jiang, Yuan Li, Fan Wu, Jianjun Wu, Ronan Sauleau, Wei Hong
Summary: This paper proposes an integrated dual-band dual-circularly polarized transmit-array antenna for K- and Ka-bands. Antenna-filter-antenna based polarization twisting TA cells are designed to achieve efficient circular-polarization transmission without using phase shifting lines. The dual-band dual-CP transmissive beamforming characteristics are realized by arranging K- and Ka-band cells in the same aperture and employing a hybrid phase compensation strategy. The measured results show that the antenna has independently controllable dual CP beams in K-band and Ka-band.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Computer Science, Information Systems
Reda Madi, Antonio Clemente, Ronan Sauleau
Summary: This paper presents a novel design and experimental characterization of a dual-band, shared aperture transmitarray operating in dual linear polarization at K/Ka-band. It is based on a 1-bit unit-cell realized using five metal layers and demonstrates low transmission loss (< 2 dB). The proposed transmitarray is able to shape the beam independently in both K- and Ka-bands by combining the polarization rotation method and the stacked patch architecture. Experimental results show excellent agreement with numerical and full-wave electromagnetic simulations. The antenna system is a low-cost and compact solution for future vehicular broadband SatCom applications.
Article
Engineering, Electrical & Electronic
Zain Haider, Yves Le Drean, Giulia Sacco, Denys Nikolayev, Ronan Sauleau, Maxim Zhadobov
Summary: This study evaluates the local power and electric field distributions inside high-resolution 3D anatomical CAD models of cutaneous appendages at 60 GHz. The results show that different cutaneous appendages exhibit different power loss density and internal electric field under different polarization directions.
IEEE JOURNAL OF MICROWAVES
(2022)
Article
Engineering, Electrical & Electronic
Yuan Li, Zhi Hao Jiang, Xuanfeng Tong, Fan Wu, Nan Shen, Ronan Sauleau, Wei Hong
Summary: This paper presents the design and experimental validation of wideband dual-circularly-polarized reflect-arrays based on dual-functional-layered unit cells. The proposed design utilizes circular polarization selective surfaces and reflective half-wave plates to achieve reflective beamforming of CP waves. The results show high gain and bandwidth performance, making it a promising candidate for wireless and satellite communications.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Charalampos Stoumpos, Jean-Philippe Fraysse, George Goussetis, Ronan Sauleau, Herve Legay
Summary: A novel and efficient dual-polarized horn-like antenna is introduced in this paper. It uses a radiating aperture fed by four smaller waveguides through a quad-furcated junction. The antenna includes a full feed network and an integrated 4-way orthomode power divider. The proposed design is compact and exhibits high aperture efficiency levels.
IEEE OPEN JOURNAL OF ANTENNAS AND PROPAGATION
(2022)
