Results 231 to 240 of about 38,397 (265)
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1986 International Electron Devices Meeting, 1986
High power klystrons operating in the 300-600 MHz frequency range, used in science for particle accelerators, have the drawback of being bulky and requiring very high voltages. Since klystron dimensions grow far less rapidly than the power they can deliver, one could propose to employ tubes of 4 to 5 MW each when total power requirements are of several
M. Bres, G. Faillon, D.T. Tran
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High power klystrons operating in the 300-600 MHz frequency range, used in science for particle accelerators, have the drawback of being bulky and requiring very high voltages. Since klystron dimensions grow far less rapidly than the power they can deliver, one could propose to employ tubes of 4 to 5 MW each when total power requirements are of several
M. Bres, G. Faillon, D.T. Tran
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Multibeam reflecting nanoklystron
2008 International Conference on Microwave and Millimeter Wave Technology, 2008The aim of the present paper is to address the issues of whether it is possible to designed develop by numerical simulation the electromagnetic continuous-wave THz- sources width electrically tunable frequency. These sources may well find their use, say, in the fields of applications such as the development of THz-spectroscopy, high- resolution radars,
V. D. Yeryomka +2 more
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Multibeam Antenna in Millimeter Waves
32nd European Microwave Conference, 2002, 2002This paper deals with a multibeam antenna in 60 GHz band. This structure is based on a Butler Matrix which fed a four printed antenna array. Two different solutions are presented to avoid the crossing point of the microstrip line : a microstrip-thick slot-microstrip transition or two hybrids 90°.
Lafond, Olivier, Himdi, Mohamed
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Digest on Antennas and Propagation Society International Symposium, 2003
A multibeam antenna prototype for an ESM system is presented. The antenna is formed by a semicircular array of Vivaldi radiating elements, fed by an RKR microstrip lens. Both the lens and the array are printed on the same dielectric substrate. The antenna operates over one octave frequency band.
M. Sierra +3 more
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A multibeam antenna prototype for an ESM system is presented. The antenna is formed by a semicircular array of Vivaldi radiating elements, fed by an RKR microstrip lens. Both the lens and the array are printed on the same dielectric substrate. The antenna operates over one octave frequency band.
M. Sierra +3 more
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Multibeam coupling in photorefractive SBN:Ce
Optics Letters, 1988Theoretical and experimental results are presented for simultaneous multibeam coupling in photorefractive SBN:Ce. Within a single crystal, multiple signals are amplified through a coupling process that employs a single pump. The coupling gain of each signal results from coupling both between the pump and the signal and between different signals.
J, Ma +5 more
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Multibeam scintillation cumulative distribution function
Optics Letters, 2011The gamma-gamma probability density function is commonly used to model the scintillation of a single laser beam propagating through atmospheric turbulence. One method proposed to reduce scintillation at the receiver plane involves the use of multiple channels propagating through independent paths, resulting in a sum of independent gamma-gamma random ...
Jason A, Tellez, Jason D, Schmidt
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2017
Multibeam echosounders have revolutionized our ability to resolve seabed geomorphology and regionally define its substrate. Using a fan of narrow acoustic beams, the slant ranges, angles and returned backscattered intensity can be employed to define the seabed elevation and infer the substrate.
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Multibeam echosounders have revolutionized our ability to resolve seabed geomorphology and regionally define its substrate. Using a fan of narrow acoustic beams, the slant ranges, angles and returned backscattered intensity can be employed to define the seabed elevation and infer the substrate.
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Multibeam, laser-imploded cylindrical plasmas
Physical Review A, 1986Four orthogonal line-focused 351-nm beams have been used to implode 2-mm-long, 100-\ensuremath{\mu}m-diam thin Al cylinders. The resulting linear, high-density, high-temperature plasma has characteristics suitable as an x-ray-laser medium.
, Richardson +9 more
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Proceedings of the IEEE, 1968
The application of general N-port Butler matrices to the generation of multiple beams-from planar arrays is described. It is shown that the array must satisfy a "covering" condition. The interconnection of array and matrix is derived. The method, for determination of beam position is developed and applied to rectangular arrays to improve beam crossover
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The application of general N-port Butler matrices to the generation of multiple beams-from planar arrays is described. It is shown that the array must satisfy a "covering" condition. The interconnection of array and matrix is derived. The method, for determination of beam position is developed and applied to rectangular arrays to improve beam crossover
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Journal of the Structural Division, 1969
Simply supported multibeam bridges with elements of solid or box section are considered. The structure is idealized as a series of discrete beams, which may include edge beams, joined by longitudinal hinges. The structure is analyzed by a computer-oriented direct flexibility technique, using harmonic analysis to reduce the two-dimensional problem to a ...
Graham H. Powell +2 more
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Simply supported multibeam bridges with elements of solid or box section are considered. The structure is idealized as a series of discrete beams, which may include edge beams, joined by longitudinal hinges. The structure is analyzed by a computer-oriented direct flexibility technique, using harmonic analysis to reduce the two-dimensional problem to a ...
Graham H. Powell +2 more
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