Results 61 to 70 of about 162,087 (215)

Feed system optimization for Convex Conformal Reflectarray Antennas

, 2017
In this communication, the possibility of enhancing the performances of Convex conformal Reflectarray Antennas (CRA) adopting an ad-hoc feed system properly designed is investigated.
M Beccaria, G Virone, F Calignano, M Orefice, G Addamo, OA Peverini, D Manfredi, P Pirinoli   +7 more
core   +2 more sources

Hardware-Efficient Hybrid Precoding for Millimeter Wave Systems With Multi-Feed Reflectarrays

IEEE Access, 2018
Current hybrid precoding schemes for large-scale antenna array-aided millimeter wave (mmWave) wireless systems adopt either full-connected or sub-connected architectures based on phased array antennas (PAAs).
Zhengyi Zhou, Ning Ge, Zhaocheng Wang, Sheng Chen   +3 more
doaj   +1 more source

Sub‐THz Multifunctional Metasurfaces for Independent Transmission or Reflection Phase Manipulation

Advanced Optical Materials, Volume 14, Issue 4, 27 January 2026.
This article presents a rigorous analysis, design, and characterization of a novel sub‐THz metalens and reflective metasurface. Unlike bulky optical systems, the proposed thin, planar metasurface enables dual‐band full‐space wavefront control, via low‐loss transmission and reflection phase tuning, offering compact integration and improved ...
Bilal Ouardi, Orestis Koutsos, Olivier de Sagazan, Malo Robin, Ronan Sauleau, Antonio Clemente   +5 more
wiley   +1 more source

Fractal Reflectarray Antennas: State of Art and New Opportunities

International Journal of Antennas and Propagation, 2016
Fractal geometries are appealing in all applications where miniaturization capabilities are required, ranging from antennas to frequency selective surfaces (FSS) design.
S. Costanzo, F. Venneri, G. Di Massa, A. Borgia, A. Costanzo, A. Raffo   +5 more
doaj   +1 more source

A Scalable and Integrated Reconfigurable Intelligent Surface

Advanced Electronic Materials, Volume 12, Issue 1, 7 January 2026.
A scalable X‐band reconfigurable intelligent surface is presented using one‐bit phase‐tunable unit cells with integrated FPGA control. The RIS supports fast, high‐speed reconfiguration through WiFi, LAN, and USB interfaces and can be scaled to multiple tiles. The design achieves over 20 dBi broadside gain and reliable 2D beam steering in both elevation
Zaid Akram, Mostafa Elsayed, Hira Hameed, Mirza Shujaat Ali, Jalil ur Rehman Kazim, Muhammad Ali Imran, Qammer H. Abbasi   +6 more
wiley   +1 more source

Tunable Reflectarray Cell for Wide Angle Beam-Steering Radar Applications

Journal of Electrical and Computer Engineering, 2013
An electronically tunable reflectarray element is proposed in this work to design beam-steering antennas useful for radar applications. A reduced size reflectarray unit cell is properly synthesized in order to extend the antenna beam scanning ...
F. Venneri, S. Costanzo, G. Di Massa
doaj   +1 more source

Wideband Circularly Polarized Dielectric Reflectarray Using Sequential Rotation of L‐Shaped Dielectric Resonators

Electronics Letters, Volume 62, Issue 1, January/December 2026.
An asymmetric L‐shaped dielectric Pancharatnam–Berry phase unit cell is proposed to enable CP‐preserving reflection with an intrinsic 180 phase difference between the orthogonal linear components. ABSTRACT In this work, we detail the design and experimental validation of a wideband circularly polarized dielectric reflectarray.
Kitch Mensah‐Bonsu, Binbin Yang
wiley   +1 more source

Efficient Design of the Microstrip Reflectarray Antenna by Optimizing the Reflection Phase Curve

International Journal of Antennas and Propagation, 2016
The microstrip reflectarray antenna is an attractive directional antenna combining advantages of both the reflector and the microstrip array antenna. For the design of this kind of antenna, the conventional method, which is based on the reflection phase ...
Xing Chen, Qiang Chen, Pan Feng, Kama Huang   +3 more
doaj   +1 more source

Geometric Phase Metasurface for Lens Antenna System With High Polarisation Purity and Efficiency

IET Microwaves, Antennas &Propagation, Volume 20, Issue 1, January/December 2026.
This work presents a millimetre‐wave antenna–metalens system based on the Pancharatnam–Berry phase principle, operating efficiently from 82 to 95 GHz. The system achieves high directivity (up to 34.7 dB), excellent polarisation purity (AR < 2 dB) and aperture efficiency exceeding 30%. The same metalens is also characterised at 75 and 105 GHz, where the
Alexia Moreno‐Peñarrubia, Sheyly Ortiz‐Reyes, Jorge Teniente, Sergei Kuznetsov, Bakhtiyar Orazbayev, Miguel Beruete   +5 more
wiley   +1 more source

Enhanced signal coverage in Metropolitan areas using slotted square reflectarray antennas

Journal of Engineering and Applied Science
Efficient wireless communication in densely populated urban environments often encounters challenges related to signal propagation, especially in indoor and obstructed settings.
V. Narasimha Nayak, Nageswararao Naik Bhookya, G. Challa Ram, Chavvakula Janaki Devi, Manumula Srinubabu, Aylapogu Pramod Kumar, M. Venkateswara Rao   +6 more
doaj   +1 more source