Results 71 to 80 of about 16,742 (248)
Polarisation switchable slot-ring array antenna
IET Microwaves, Antennas & Propagation, 2008 A reconfigurable antenna is attractive for advanced wireless communication systems in the future. A novel polarisation switchable slot-ring array antenna as a kind of reconfigurable antenna is proposed. To realise the orthogonal polarisation switchable antenna, four switching diodes are mounted on a slot-ring antenna element.
E. Nishiyama, M. Aikawa, S. Sasaki
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Advanced Robotics Research, EarlyView.A flexible, skin‐integrated electromagnetic actuator is developed for wearable virtual/augmented reality (VR/AR) haptic systems. A tunable design model enables control over displacement and resonance frequency. The system is validated through a custom VR application with a 6 × 4 actuator array, demonstrating real‐time, spatially targeted tactile ...
Naji Tarabay +9 more
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Advanced Science, EarlyView.Photonic time crystals (PTCs) are systems in which electromagnetic parameters are modulated periodically in time, producing momentum bandgaps via temporal scattering rather than spatial Bragg processes. This review examines the theoretical frameworks, modeling, and computational tools for time‐varying media, and summarizes experimental demonstrations ...
Ranjan Kumar Patel +3 more
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FORMATION OF THE DIRECTION DIAGRAM IN PHASED ANTENNA ARRAY
Российский технологический журнал, 2019 The article presents the results of the study of phase and temporal methods in the formation of the direction diagram of phased antenna array, and carries out a comparative analysis using an eight-element equidistant antenna array based on Vivaldi ...
N. M. Legkiy, I. V. Unchenko
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Advanced Science, EarlyView.This work demonstrates a heterojunction‐gated infrared phototransistor for broadband detection from 350 to 1700 nm. By suppressing defect states on nonpolar (100) facets of large PbS quantum dots via hybrid ligand passivation, the device achieves a room‐temperature detectivity of 5.7 × 1013 Jones at 1650 nm.
Hongkun Duan +14 more
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Solution‐Processed Organic Photovoltaics: Fabrication Advances and Challenges
Advanced Science, EarlyView.This review highlights recent advances in organic photovoltaic (OPV) device fabrication, emphasizing how material selection, interface engineering, and scalable processing techniques shape device performance. It discusses progress in photoactive and charge transport layers, electrode optimization, and large‐area manufacturing, offering insights into ...
Kerui Liu +4 more
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Broadband modified turnstile antenna Patent [PDF]
, 1970 Broadband modified turnstile antenna for use in space tracking and ...
Lemson, P. H.
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NASA's Great Observatories Kit [PDF]
Using this kit, students may construct paper models of the Hubble Space Telescope, the Chandra X-Ray Observatory, and the Compton Gamma Ray Observatory. Parts sheets for printing, instructions, and a list of other required materials are included.
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Advanced Electronic Materials, EarlyView.Composites made of semiconducting carbon nanotubes and p‐type polymers, when adequately doped with molecular dopants, can exhibit highly delocalized charge carrier transport, showing high thermoelectric performances. The efficient charge delocalization is enabled by the reduced coulombic binding energy at high carrier concentration and the small ...
Ye Liu +7 more
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Bandwidth Enhancement of Antenna Arrays Utilizing Mutual Coupling between Antenna Elements
International Journal of Antennas and Propagation, 2010 The mutual coupling effect between antenna elements on an array's bandwidth is investigated using scattering parameters instead of the mutual impedance. First, an approximate expression is derived for matched voltage standing wave ratio (VSWR) bandwidth ...
Min Wang, Wen Wu, Zhongxiang Shen
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