Results 11 to 20 of about 102,163 (333)

Optimization of a Coherent Dual-Beam Array Feed Network for Aperiodic Concentric Ring Antennas

open access: yesApplied Sciences, 2021
A dual-beam coherent feeding system design approach with a non-uniform layout on a concentric ring array is described and synthesized. In this case, the feeding system is based on a reconfigurable topology composed of a set of alternated power dividers ...
Armando Arce   +5 more
doaj   +1 more source

Dual-Beam Leaky-Wave Antenna Array With Capability of Fixed-Frequency Beam Switching

open access: yesIEEE Access, 2020
A novel fixed-frequency beam switchable dual-beam antenna array is presented, which consists five dual-beam leaky-wave antenna (LWA) elements designed on substrate integrated waveguide (SIW) and integrated together on a common substrate. The LWAs work on
Xiaowen Li   +5 more
doaj   +1 more source

Novel Dual-Band Beam-Scanning/Switching Network Based on a Hybrid Coupler With Synchronously Tuned Phase Differences

open access: yesIEEE Access, 2021
This paper proposes a novel feeding network that enables the antenna array to perform dual-band continuous beam scanning and beam switching between forward and backward directions.
Pei-Ling Chi   +3 more
doaj   +1 more source

The effect of nanoparticle size on thermal diffusivity of gold nano-fluid measured using thermal lens technique [PDF]

open access: yesJournal of the European Optical Society-Rapid Publications, 2013
A dual beam mode-mismatched thermal lens method has been employed to investigate the dependence of thermal diffusivity of gold nanofluid on nanoparticles sizes. The samples were prepared at various sizes by utilizing the gamma radiation method.
Shahriari E., Mat Yunus W. M., Zamiri R.
doaj   +1 more source

Electronic Beam Steering Metamaterial Antenna with Dual-Tuned Mode of Liquid Crystal Material

open access: yesSensors, 2023
In this study, a dual-tuned mode of liquid crystal (LC) material was proposed and adopted on reconfigurable metamaterial antennas to expand the fixed-frequency beam-steering range.
Shuang Ma   +3 more
doaj   +1 more source

A MIMO Antenna System Using Self-Decoupled EMSIW Dual-Beam Antenna Elements

open access: yesIEEE Access, 2022
This paper presents a two-element MIMO antenna system using two dual-beam EMSIW antenna elements. The dual-beam pattern is achieved by creating two weak field areas using EMSIW. The antenna elements are placed in the weak field areas of each other, which
Priya Kumari, Sushrut Das
doaj   +1 more source

Ultrafast Dynamics of Extraordinary Optical Transmission through Two-Slit Plasmonic Antenna

open access: yesNanomaterials, 2023
We have theoretically investigated the spatial-temporal dynamics of extraordinary optical transmission (EOT) through a two-slit plasmonic antenna under femtosecond laser dual-beam irradiation.
Guangqing Du   +7 more
doaj   +1 more source

Dual self-accelerating properties of one-dimensional finite energy Pearcey beam

open access: yesResults in Physics, 2019
Based on potential-free linear Schrödinger equation, we investigate the dynamics of one-dimensional finite energy Pearcey beam in free space. The result shows that the Pearcey beam evolves in the form of two-dimensional Pearcey function and exhibits a ...
Feng Zang, Yan Wang, Lu Li
doaj   +1 more source

Dual-Polarized Multi-Beam Fixed-Frequency Beam Scanning Leaky-Wave Antenna

open access: yesSensors, 2023
A fixed-frequency beam-scanning leaky-wave antenna (LWA) array with three switchable dual-polarized beams is proposed and experimentally demonstrated. The proposed LWA array consists of three groups of spoof surface plasmon polaritons (SPPs) LWAs with ...
Dapeng Chu   +4 more
doaj   +1 more source

Enabling broadband efficient beam splitting based on ultra-thin reflecting metasurfaces

open access: yesResults in Physics, 2023
In this paper, we present a scheme for achieving broadband efficient beam splitting based on homogeneous ultra-thin metasurfaces, which is composed of an ultrathin dielectric spacer sandwiched between periodic arrays of identical rectangular metal ...
Jing Li   +5 more
doaj   +1 more source

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