Results 61 to 70 of about 1,366 (208)
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 +1 more source
MEMS-Reconfigurable Metamaterials and Antenna Applications
International Journal of Antennas and Propagation, 2014 This paper reviews some of our contributions to reconfigurable metamaterials, where dynamic control is enabled by microelectromechanical systems (MEMS) technology.
Tomislav Debogovic +1 more
doaj +1 more source
IET Microwaves, Antennas &Propagation, Volume 20, Issue 1, January/December 2026.This study introduces a compact H‐shaped 1‐bit linearly polarised Reconfigurable Intelligent Surface (RIS) prototype, specifically engineered for high‐gain and beam‐scanning applications at 5.1 GHz. The fabricated 20 × 20 RIS array exhibited a gain of 23.1 dBi, a scanning capability of ± 60° and an aperture efficiency of approximately 57%, as validated
Rocky Chakma +4 more
wiley +1 more source
Electronics Letters, 2003 It is shown that the dominant factor controlling reflectarray bandwidth is the bandwidth of the radiating element, and that the effect of non-constant path delays over the surface of the flat reflector has little significance unless the aperture is electrically very large and the f/D ratio is small. An example of a polarisation-twist reflectarray using
openaire +1 more source
IET Microwaves, Antennas &Propagation, Volume 20, Issue 1, January/December 2026.This paper presents a frequency‐reconfigurable dual‐band nematic liquid‐crystal (LC) reflectarray antenna with angular beam separation for satellite communication. Dual‐band operation at 12 and 28 GHz is achieved through voltage‐controlled reconfiguration of the LC layer.
Hsi‐Hsir Chou +3 more
wiley +1 more source
Design of Circularly Polarized and Highly Depointing Reflectarrays with high polarization purity
, 2022 International audienceThis work aims to investigate the limitations and possible solutions in designing highly tilted radiation pattern reflectarrays working in double circular polarization and fed by an onset single primary source. To this extent, three
Bresciani, Daniele +4 more
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IET Microwaves, Antennas &Propagation, Volume 20, Issue 1, January/December 2026.An efficient and broad‐band reflective microstrip polariser converter is proposed that converts linear polarization plane waves to circular polarization ones. It is experimentally shown that the designed device converts the LP plane‐waves to a CP one within 7.2∼12.6 GHz with 3‐dB AR bandwidth = 54.5%.
Mahdieh Bozorgi, Mahmood Rafaei‐Booket
wiley +1 more source
IET Microwaves, Antennas &Propagation, Volume 20, Issue 1, January/December 2026.This paper presents a broadband 1‐bit reconfigurable transmitarray operating at 11.7 GHz, using interdigital structures to achieve a 23.1% 3‐dB transmission‐loss bandwidth without requiring an air gap. An EM‐acquired CRCS‐based link gain model is developed to evaluate the radiation gain, scattering characteristics and gain‐frequency response of the RTA.
Ting‐Hao Shih +2 more
wiley +1 more source
Designing of a dual-band printed reflectarray based on the modified Floque cell
Известия высших учебных заведений России: Радиоэлектроника, 2015 Method of designing of a dual-band printed reflectarray with improved characteristics is described. Calculated data for printed reflectarrays based on the modified and common Floque cell are presented.
S. V. Ballandovich
doaj
Advanced Electronic MaterialsOptically transparent electromagnetic devices play a crucial role in modern society, yet conventional optically transparent millimeter‐wave devices suffer from high return loss, limited phase shift, narrow bandwidth, high profile, and low optical ...
Longzhu Cai +5 more
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