Results 71 to 80 of about 68,865 (333)
A low‐profile wideband spiral antenna with multiple stopbands
IET Microwaves, Antennas & Propagation, 2023 A low‐profile spiral antenna with three stopbands (2.55 GHz band, 3.85 GHz band, and 5.45 GHz band) is developed. The stopbands are generated using three pairs of slots cut into the spiral arms.
Masahiro Tanabe, Hisamatsu Nakano
doaj +1 more source
Statistical model of a highly directional digital antenna array with a spatial correlation method of signal processing [PDF]
, 2023 И.М. Орощук +2 more
openalex +1 more source
Advanced Functional Materials, EarlyView.For the first time, a highly sensitive electrochemical biosensor based on SiO2‐based hairy particles with a grafted PDMAEMA polymer brush containing a quantifiable and large amount of immobilized Laccase is reported. The fabricated biosensor exhibits a sensitivity of 0.14 A·m⁻¹, a limit of detection (LOD) of 0.1 µm, and a detection range of 0.3–750 µm,
Pavel Milkin +7 more
wiley +1 more source
Wide-band CEBG-based directive antenna [PDF]
2007 IEEE Antennas and Propagation Society International Symposium, 2007 The design and experimental results for a new wide-band (78%) Cylindrical EBG directive antenna are presented. The motivation for this work was the design of an agile antenna for tactical communications systems operating in the band 1.35GHz - 2.7 GHz.
Boutayeb, Halim +3 more
openaire +2 more sources
Biomass Native Structure Into Functional Carbon‐Based Catalysts for Fenton‐Like Reactions
Advanced Functional Materials, EarlyView.This study indicates that eight biomasses with 2D flaky and 1D acicular structures influence surface O types, morphology, defects, N doping, sp2 C, and Co nanoparticles loading in three series of carbon, N‐doped carbon, and cobalt/graphitic carbon. This work identifies how these structural factors impact catalytic pathways, enhancing selective electron
Wenjie Tian +7 more
wiley +1 more source
IEEE Access, 2019 Electromagnetic spectrum distribution prediction is the basis for the development of wireless communication technology. Due to the high randomness of the rough sea surface, it is difficult to accurately predict the offshore electromagnetic spectrum ...
Zhenjia Chen, Yonghui Zhang
doaj +1 more source
High Directive Antenna with Virtual Aperture [PDF]
2009 IEEE Antennas and Propagation Society International Symposium, 2009 Here we propose a spherical shell-core structure which is able to achieve arbitrarily large directivity. The structure is obtained from coordinate transformation. A small antenna can be projected to free space with a large dimension, which subsequently leads to a large directivity.
Zhang, Baile +2 more
openaire +3 more sources
Advanced Functional Materials, EarlyView.The first cryo‐EM visualization and quantification of oriented Photosystem I (PSI) on single‐layer graphene is reported. Domain‐specific covalent anchoring of PSI, with the reducing side of the biophotocatalyst toward graphene, promotes three‐fold higher anodic photocurrent generation compared to a randomly physisorbed counterpart. This approach allows
Miriam Izzo +6 more
wiley +1 more source
Planar microstrip YAGI antenna array [PDF]
, 1993 A directional microstrip antenna includes a driven patch surrounded by an isolated reflector and one or more coplanar directors, all separated from a ground plane on the order of 0.1 wavelength or less to provide end fire beam directivity without ...
Huang, John
core +1 more source
Tractable yet effective approximation to directional antenna array for millimeter-wave networks
物联网学报, 2018 The complexity of the actual antenna pattern imposes restrictions on investigating the benefits of directional antenna arrays in large-scale networks.Hence,a novel multi-level flat-top antenna pattern was proposed to approximate and simplify the actual ...
Na DENG, Haichao WEI
doaj +2 more sources