Results 101 to 110 of about 2,076,516 (339)
Advanced Materials, EarlyView.Transition metal oxy/carbo‐nitrides show great promise as catalysts for sustainable processes. A Mn‐Mo mixed‐metal oxynitride attains remarkable performance for the direct synthesis of acetonitrile, an important commodity chemical, via sequential C─N and C─C coupling from syngas (C1) and ammonia (N1) feedstocks.
M. Elena Martínez‐Monje +7 more
wiley +1 more source
Design and realization of tracking feed antenna system
IEICE Electronics Express, 2011 This paper describes the design and realization of a multi-mode tracking feed antenna system, for a circularly polarized wave, which can generate sum and difference patterns suitable for monopulse tracking in remote sensing earth stations. It uses TE11 and TE21 modes, in a smooth circular waveguide, to obtain the sum and difference patterns. The higher
S. H. Mohseni Armaki +3 more
openaire +2 more sources
Multi‐Domain Detection Computational Imaging via Reconfigurable Metasurfaces MIMO System
Advanced Materials InterfacesA reconfigurable transmission metasurfaces (RTMs) excited by a multiple‐input multiple‐output (MIMO)( RTMs‐MIMO) antenna is designed to implement multi‐domain metamaterial computational imaging (MCI).
Jianghao Tian +4 more
doaj +1 more source
The Journal of Engineering, 2019 A 1 × 4 low-loss frequency scanning planar array with hybrid feeding structure in Ku-band has been designed. In order to improve the array efficiency, the planar array was designed by four parallel sub-arrays and the waveguide slow-wave line structure ...
Hao Wang +4 more
doaj +1 more source
FREQUENCY AND POLARIZATION RECONFIGURABLE MICRO-STRIP ANTENNA
, 2018 This paper presents a dual band frequency and polarization reconfigurable microstrip antenna. The simple design consists of two slots and two feeds. In one slot there is a switch.
Farooq, Muhammad +2 more
core +1 more source
Radiating elements and excitation networks for compact and highly efficient antenna feeds [PDF]
, 2020 Driven by the advent of broadband connectivity via satellites, the framework of this thesis addresses the development of advanced antenna feed systems for direct radiating arrays (DRAs) or array fed reflectors (AFRs) enabling the provision of the ...
Charalampos, Stoumpos
core
Advanced Materials, EarlyView.Metal‐free carbon catalysts enable the sustainable synthesis of hydrogen peroxide via two‐electron oxygen reduction; however, active site complexity continues to hinder reliable interpretation. This review critiques correlation‐based approaches and highlights the importance of orthogonal experimental designs, standardized catalyst passports ...
Dayu Zhu +3 more
wiley +1 more source
A 3D-Printed Spherical Dual-Circular Polarized Luneburg Lens Antenna for Ku-Band
IEEE AccessIn this paper, we propose a novel three-dimensional-printed Luneburg lens for converting linear polarization to dual-circular polarization and successfully apply it in a multibeam antenna.
Qing Wang +4 more
doaj +1 more source
The Journal of Engineering, 2019 A W-band low-sidelobe series-fed microstrip antenna array is proposed here. Impedance matching section weighting method is used in element series-fed weighting.
Song Song, Wei Wang, Xuetian Wang
doaj +1 more source
, 2010 This paper presents a comparison the Eleven Antenna and the ETS-Lindgren quadridge horn in terms of their radiation performance as feeds for reflector antennas.
Pivnenko, S +3 more
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