Results 71 to 80 of about 2,996 (222)

Fully Controllable Beam‐Steering 1‐THz Transmitarray Using Graphene–Metal Hybrid Metasurface

IET Microwaves, Antennas &Propagation, Volume 19, Issue 1, January/December 2025.
The switchable hybrid graphene–metal transmiting metasurface. The transmitarray composed of the proposed metasurface, for beam steering, controlable by a microprocessing unit. ABSTRACT In this paper, a 1‐THz graphene–metal‐hybrid transmissive metasurface is proposed, which consists of six layers.
P. Hosseini, H. Oraizi
wiley   +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, Xiaoxue Fan, Yanni Wang, Xiaoting Ma, Yan Wang, Wangzhe Li   +5 more
wiley   +1 more source

A Ka-Band Cylindrical Paneled Reflectarray Antenna [PDF]

Electronics, 2019
Cylindrical parabolic reflectors have been widely used in those applications requiring high gain antennas. Their design is dictated by the geometric relation of the parabola, which relate the feed location, f, to the radiating aperture, D. In this work, the use of reflectarrays is proposed to increase D without changing the feed location.
greco francesco, boccia luigi, arnieri emilio, amendola gian domenico   +3 more
openaire   +1 more source

Design of an Energy Selective Reflectarray Antenna for Adaptive Prevention of High‐Intensity Radiation Fields

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, Zhuang Qu, Ming Xu, Duocai Zhai, Song Zha, Peiguo Liu   +5 more
wiley   +1 more source

Reconfigurable Intelligent Surfaces for Wireless Communications: Principles, Challenges, and Opportunities

, 2020
Recently there has been a flurry of research on the use of reconfigurable intelligent surfaces (RIS) in wireless networks to create smart radio environments.
ElMossallamy, Mohamed A., Han, Zhu, Li, Geoffrey Ye, Seddik, Karim G., Song, Lingyang, Zhang, Hongliang   +5 more
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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, Guillaume François, Dirk Heberling, Suramate Chalermwisutkul   +3 more
wiley   +1 more source

Bandwidth Enhancement of Dielectric Resonator Reflectarray Antenna [PDF]

Electromagnetics, 2014
Aperture-coupled dielectric resonator antenna is proposed using a novel reflectarray antenna unit cell structure. It is shown that a bowtie-shaped slot can enhance the bandwidth performance of a reflectarray antenna. The unit cell's reflection phase response was verfified experimentally using the waveguide simulator method.
Ahmadi, Farzaneh, Forooraghi, Keyvan, Atlasbaf, Zahra, Virdee, Bal Singh   +3 more
openaire   +1 more source

A Wideband Multibeam Transmitarray Antenna Based on 3‐D FSS

IET Microwaves, Antennas &Propagation, Volume 19, Issue 1, January/December 2025.
This paper presents a novel method for designing a wideband dual‐polarised multibeam transmitarray antenna. Through numerical calculations, simulations and measurements, the TA demonstrates outstanding multibeam radiation characteristics. ABSTRACT This paper presents a novel method for designing a wideband dual‐polarised multibeam transmitarray antenna.
Longfei Wang, Wanping Zhang, Yumei Chang, Bo Li, Lei Zhu   +4 more
wiley   +1 more source

Broadband Lumped Mirror Array mmWave Antenna for Wireless and Defense Systems

Journal of Electrical and Computer Engineering, Volume 2025, Issue 1, 2025.
This article introduces a novel lumped mirror array mmWave antenna designed for multiband microwave applications, including 5G, satellite communication, and defense systems. The antenna operates over a broad frequency range from 4.7 to 67.63 GHz, offering excellent impedance bandwidth of 70.4%. Developed on an FR‐4 substrate with dimensions of 160 × 70 
Manish Varun Yadav, Lanston Pramith Fernandes, Swati Varun Yadav, Tanweer Ali, Dinesh Yadav, Vikas Singh, Kirti Panwar bhati, Shonak Bansal   +7 more
wiley   +1 more source

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