Results 81 to 90 of about 1,366 (208)

Terahertz reflectarrays [PDF]

, 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  

An investigation of millimeter wave reflectarrays for small satellite platforms [PDF]

, 2019
This article reports two contributions related to reflectarray antenna design at millimeter waves (mm-waves). First, a closed form analytical formulation is provided for the prediction of reflection properties of square/rectangular mm-waves reflectarray ...
Ahmad, Ghulam, Underwood, Craig I., Loh, Tian H., Brown, Tim W.C.   +3 more
core   +1 more source

Active Reflectors: Possible Solutions Based on Reflectarrays and Fresnel Reflectors

International Journal of Antennas and Propagation, 2009
An overview about some of the recent Spanish developments on active reflectors is presented. In the first part, a novel beamsteering active reflectarray is deeply studied. It is based on implementing in each elementary radiator an IQ modulator structure,
Lorena Cabria, José Ángel García, Julio Gutiérrez-Ríos, Antonio Tazón, Juan Vassal'lo   +4 more
doaj   +1 more source

Optimization of Reactively Loaded Reflectarrays via Semidefinite Relaxation [PDF]

, 2018
The versatile semidefinite relaxation-based optimization framework developed for near-field wireless power transfer (WPT) systems is adopted for optimization of scanned reflectarrays in the far-field.
Lang, Hans-Dieter, Sarris, Costas D., Hans-Dieter Lang, Sean V. Hum, Hum, Sean V., Costas D. Sarris   +5 more
core   +1 more source

Modified Minkowski Fractal Unit Cell for Reflectarrays with Low Sensitivity to Mutual Coupling Effects

International Journal of Antennas and Propagation, 2019
A single-layer miniaturized reflectarray element with low sensitivity to mutual coupling effects of surrounding elements is presented in this paper.
Sandra Costanzo, Francesca Venneri, Giuseppe Di Massa   +2 more
doaj   +1 more source

Fast power pattern synthesis of conformal reflectarrays

, 2008
The aim of the paper is to propose a fast phase only synthesis (POS) approach to the power pattern synthesis of conformal, shaped-beam reflectarrays, based on FFTs. First, the synthesis approach is described, then the approximation strategy exploited for
LISENO, ANGELO, G. D'Elia, CAPOZZOLI, AMEDEO, A. Liseno, A. Capozzoli, CURCIO, CLAUDIO, D'ELIA, GIUSEPPE, C. Curcio   +7 more
core   +1 more source

Analysis of line-source-fed single-layer microstrip reflectarrays [PDF]

, 2001
The analysis of scattering from an infinite periodic array of microstrip patches is used to study line-source-fed single-layer microstrip reflectarrays. An application of these reflectarrays is in high-gain conformal antennas. Employing rectangular patch
Sze, Kin Yip
core  

A Single-Layer Dual-Band Reflectarray Cell for 5G Communication Systems

International Journal of Antennas and Propagation, 2019
A single-layer dual-band reflectarray cell is proposed in this work for future 5G systems. A reflectarray unit cell operating at 28/38 GHz is designed by adopting two pairs of miniaturized fractal patches, offering low losses (
Sandra Costanzo, Francesca Venneri, Antonio Borgia, Giuseppe Di Massa   +3 more
doaj   +1 more source

Dual-band and dual-polarized reflective Fresnel zone plate design based on Fractal shape. [PDF]

Sci Rep, 2023
Wei L, Ma C, Liu X, Ma H, Wu Y, Fan Z, Huangfu J.   +6 more
europepmc   +1 more source

True-Time-Delay Unit Cell for Ultra-Wideband Single- and Wideband Dual-Polarized Large Reflectarrays

IEEE Access
This paper presents the design and experimental validation of novel ultra-wideband true-time-delay (TTD) reflectarray unit cells for large-scale antenna applications. Two configurations are proposed: a single-polarized unit cell and a dual-polarized unit
Reza Shamsaee Malfajani, Karim Glatre, Jean-Jacques Laurin   +2 more
doaj   +1 more source