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Multi beam antennas for cellular networks
2012 IEEE 27th Convention of Electrical and Electronics Engineers in Israel, 2012Multi-Beam antenna arrays, made by H-plane waveguides with 4, 8 and 12 elements are proposed for cellular base stations. Simulated and experimental results show the beam directions, the gains, the side lobes and the overlapping between close elements, within the requirements for such products (very low loss, high power capability and flexibility in ...
Roni Marino, Haim Matzner, Ely Levine
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FEMTOSECOND CELLULAR TRANSFECTION USING A NON DIFFRACTING LIGHT BEAM
Biomedical Optics, 2007The ability to permeate selectively the cell membrane and introduce therapeutic agents is a key goal in cell biology. Optical transfection is a powerful methodology but requires exact focusing due to the required two-photon power density. The authors use a Bessel beam that obviates the need to locate precisely the cell membrane, permitting two-photon ...
X. Tsampoula +7 more
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An antenna for switch beam, multi-beam millimetre-wave cellular systems
2016 17th International Symposium on Antenna Technology and Applied Electromagnetics (ANTEM), 2016This paper presents the design and implementation of a compact, two-dimensional antenna with broadband performance capable of increasing system capacity for next generation 5G base stations. This simple low profile, parallel plate Lune burg lens can be exploited to ensure high energy efficiency, higher data rates, spectral efficiency, and extended ...
David Lee, Jafar Shaker, Yahia Antar
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3D Beam Tracking for Cellular-Connected UAV
IEEE Wireless Communications Letters, 2020Three-dimensional (3D) beamforming is an effective technique for performance enhancement in cellular-connected unmanned aerial vehicle (UAV) communications. Specifically, ground base stations (GBSs) equipped with full-dimensional (FD) antenna arrays are able to perform fine-tuned 3D transmit/receive beamforming with enhanced interference mitigation for
Yi Huang +4 more
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Fast beam discovery for mmWave cellular networks
2017 IEEE 18th Wireless and Microwave Technology Conference (WAMICON), 2017Pencil beamforming is used to compensate for channel impairments in millimeter wave cellular networks. This method requires testing of all beam combinations at the base and mobile stations in order to detect the unique beam pair with the optimum signal level for use in the control and data planes. However exhaustive search results in high computational
Mohammed Jasim, Nasir Ghani
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Composite Beam Incorporating Cellular Steel Decking
Journal of the Structural Division, 1969RESULTS OF A TEST ON A COMPOSITE STEEL AND CONCRETE BEAM INCORPORATING A CELLULAR STEEL DECK ARE REPORTED. GOOD AGREEMENT BETWEEN MEASURED AND COMPUTED VALUES OF STRAIN AND DEFLECTION IS INDICATED PRIOR TO FIRST YIELDING. THE BEAM BEHAVED IN ACCORDANCE WITH THE ELASTIC THEORY FOR COMPOSITE BEAMS WITH INCOMPLETE INTERACTION.
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Developments in composite construction and cellular beams
Steel and Composite Structures, 2005This paper describes recent developments in composite construction and their effect on codified design procedures in the UK. Areas of particular interest include: rules on shear connection, design of beams with web openings, serviceability limits, such as floor vibrations, and fire safe design.
R.M. Lawson, S.J. Hicks
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Design of composite asymmetric cellular beams and beams with large web openings
Journal of Constructional Steel Research, 2006Abstract The design of composite asymmetric cellular beams is not fully covered by existing guidance but is an area of important practical application. Asymmetry in the shape of the cross-section of cellular beams causes development of additional bending moments in the web-posts between closely placed openings.
Lawson, R.M. +3 more
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Mechanical behavior of joints with cellular beams
2020Toutes les études existantes considèrent que les poutres ajourées sont simplement appuyées. Par conséquent, les assemblages poutre-poteau sont conçus pour être nominalement articulés. Si les caractéristiques des assemblages ne sont pas affectées par les ouvertures situées au voisinage de la connexion, l'utilisation des assemblages semi-rigides ou ...
Madjour, Abdelhalim +4 more
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