Results 41 to 50 of about 1,317 (206)
Noninvasive Intelligent Brain‐Metasurface System for Real‐Time Electromagnetic Wave Manipulation
Nanophotonics, Volume 15, Issue 13, 13 July 2026.A noninvasive intelligent brain–computer interface (BCI) is integrated with a reconfigurable metasurface to establish a direct neural‐to electromagnetic transduction pathway for real time, multimodal wave control. By combining convolutional‐neural‐network‐based decoding of motor‐imagery electroencephalography (EEG) signals with threshold‐based ...
Xiao Hai +3 more
wiley +1 more source
, 2015 REFLECTARRAY, the concept combining the principles of phased arrays and geometrical optics, can produce predesigned radiation characteristics without requiring a complicated feeding network.
Niu, Tiaoming
core
Low‐Profile, High‐Gain GRIN RF Lenses via Multi‐Material Vat Photopolymerization
Advanced Functional Materials, Volume 36, Issue 53, 2 July 2026.We investigate the opportunity of leveraging multi‐material vat photopolymerization printing to manufacture intricate lenses exhibiting permittivity gradients that can increase signal gain in transmitted radiofrequency signals in the X‐ and Ku‐bands. Lenses produced with more distinct low‐loss materials (up to 5) can deliver an 18 dB signal gain with a
Lawrence Romangsuriat +3 more
wiley +1 more source
The Generalized Direct Optimization Technique for Printed Reflectarrays [PDF]
, 2014 A generalized direct optimization technique (GDOT) for the design of printed reflectarrays using arbitrarily shaped elements with irregular orientation and position is presented. The GDOT is based on the spectral domain method of moments (SDMoM) assuming
Breinbjerg, Olav +6 more
core +1 more source
Contributions to the design of sub-reflectarrays
, 2010 In this thesis we show how the ellipsoidal and hyperboloidal subreflectors, which are used in dual reflector antenna systems, can be emulated by reflectarrays (hereafter referred to as sub-reflectarrays).
Almajali, E'qab
core +2 more sources
Dipole‐Quadrupole Model and Multipole Analysis of Resonant Membrane Metasurfaces
Laser &Photonics Reviews, Volume 20, Issue 12, 18 June 2026.Membrane metasurfaces, arrays of holes in a dielectric membrane, are appealing because they require no substrate and allow access to resonant near‐fields. However, developing a comprehensive theoretical description for them remains challenging. We introduce a semi‐analytical dipole‐quadrupole approach to analyze their resonant spectra at arbitrary ...
Izzatjon Allayarov +2 more
wiley +1 more source
A Review of High Gain and High Efficiency Reflectarrays for 5G Communications
IEEE Access, 2018 The future adaptability of reflectarray antenna requires a thorough investigation of its main conventional features for expected improvements. Its existing design featuring at microwave and millimeterwave frequencies can be considered as a basic platform
Muhammad Hashim Dahri +3 more
doaj +1 more source
Advanced Materials Technologies, Volume 11, Issue 4, 19 February 2026.An LCD‐compatible complementary liquid‐crystal metasurface delivers dual‐band, dual‐polarized Ka‐band wavefront control with millisecond switching via a 10‐µm LC gap. Interlaced patch/slot pairs enable independent phase tuning at 28 and 38 GHz, while strategic 45° slot rotation suppresses parasitic resonances. Measurements on a 160 × 160‐cell prototype
Daehyeon Kim +4 more
wiley +1 more source
Development of a Pin Diode-Based Beam-Switching Single-Layer Reflectarray Antenna
International Journal of Antennas and Propagation, 2020 This paper presents a practical demonstration for the design and development of a switchable planar reflectarray using PIN diodes in the X-band frequency range.
Muhammad Inam Abbasi +2 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 +5 more
wiley +1 more source