Results 91 to 100 of about 10,722 (267)
Keberkesanan program industrial skills enhancement programme (INSEP) dalam membantu peningkatan kemahiran kebolehpekerjaan peserta program di pusat pembangunan kemahiran negeri [PDF]
, 2006 Pengangguran di kalangan siswazah merupakan satu masalah global dan ia menjadi satu isu yang hangat diperdebatkan di Malaysia baru-baru ini. Salah satu langkah untuk mengatasi masalah ini ialah dengan melaksanakan program Industrial (INSEP) di Malaysia ...
Hai Kelian, Virakwan
core
Systematic Framework for Reflectarray Synthesis Based on Phase Optimization [PDF]
, 2012 A new systematic synthesis framework for reflectarray antennas is discussed. Optimization based on the Levenberg-Marquardt algorithm is used to obtain the phase distribution of the reflection coefficients required on the reflectarray surface, in order to
Arrebola Baena, Manuel +3 more
core +3 more sources
Reflectarray Antennas printed on convex surfaces [PDF]
2015 International Conference on Electromagnetics in Advanced Applications (ICEAA), 2015 The characteristics of Reflectarray Antennas printed on convex curved surfaces are discussed in this paper. In particular, results will be presented on the radiation performances of Reflectarrays designed to fit cylinders with different radii of curvature, and with different types of radiating elements.
Bui Van H.a. +4 more
openaire +1 more source
Wide‐Angle Scanning Array With Sidelobe Reduction Using Single Substrate Layer
IET Microwaves, Antennas &Propagation, Volume 19, Issue 1, January/December 2025.Without the need for amplitude weighting, the proposed array can achieve beam scanning from −70° to 70° with a gain fluctuation of less than 0.8 dB while maintaining sidelobe levels below −11 dB. The proposed array has the advantages of simple structure, wide beam coverage, low gain fluctuation, and low sidelobe level.
Shang‐Yang Li +5 more
wiley +1 more source
Multifed Printed Reflectarray With Three Simultaneous Shaped Beams for LMDS Central Station Antenna [PDF]
, 2008 A two-layer reflectarray is proposed as a central station antenna for a local multipoint distribution system (LMDS) in the 24.5-26.5 GHz band. The antenna produces three independent beams in an alternate linear polarization that are shaped both in ...
Arrebola, Manuel +2 more
core +3 more sources
IET Microwaves, Antennas &Propagation, Volume 19, Issue 1, January/December 2025.This work presents an adaptive reflectarray for the high‐intensity radiation fields (HIRF) prevention in X‐band, thereby reducing the risk of interference or damage to front‐ends, receiving links, and other electronic components. ABSTRACT This paper presents an energy selective reflectarray antenna with field‐induced gain to prevent the high‐intensity ...
Jihong Zhang +5 more
wiley +1 more source
IEEE Access, 2019 A broadband single-layer reflectarray antenna comprising circular ring elements dented with sectorial slits is presented. The sizes of circular rings are fixed and equal for all elements, while the variation of the reflected phase is obtained by varying ...
Huiting Yu, Lu Guo
doaj +1 more source
Study of bifocal dual reflectarray configurations for multi-beam antennas in ka-band [PDF]
, 2017 This paper describes the design of multi-beam dual reflectarray antennas for operation in the Ka-band satellite transmission band (around 20 GHz), using the bifocal design concept to improve antenna performance.
Antonio Pino +4 more
core +2 more sources
Design and Characterisation of All‐Dielectric Metasurface Reflector for mmWave Antennas
IET Microwaves, Antennas &Propagation, Volume 19, Issue 1, January/December 2025.This study presents an all‐dielectric artificial magnetic conductor (AMC) operating at 77 GHz with zero‐phase reflection, featuring a −1‐dB reflection bandwidth of 3.6 and 8.2 GHz for ± 45° and ± 90° reflection phases, respectively. Simulation and measurement results validate the design's performance while highlighting discrepancies attributed to ...
Muhammad Uzair +3 more
wiley +1 more source
Engineering Science and Technology, an International Journal, 2020 An X-band high-power microwave antenna with arbitrarily (elliptical) polarization is proposed and investigated in this paper. The proposed antenna is founded on a reflectarray composed of printed elements and excited by the microwave energy in the ...
Sahar Abdi Tazehabadi, Shahrokh Jam
doaj +1 more source