Results 231 to 240 of about 2,245,350 (289)
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1968
In this book, first published in 1968, King and his co-authors develop a theory of the behaviour of arrays of rod-shaped antennas such as are used to achieve directive transmission and reception of radio waves for use in communication between points on the earth, between the earth and a space vehicle, or in radio astronomy.
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In this book, first published in 1968, King and his co-authors develop a theory of the behaviour of arrays of rod-shaped antennas such as are used to achieve directive transmission and reception of radio waves for use in communication between points on the earth, between the earth and a space vehicle, or in radio astronomy.
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Beamforming of Sparse Cylindrical Arrays
2017As sparse arrays cost fewer elements, they are less expensive than dense arrays and could be applied widely in antenna and sonar deployment, two sparse cylindrical arrays are proposed in this paper. According to the characteristic of cylindrical array, it can be seen as a linear array whose elements are the identical circular arrays.
Na Wu, Qilian Liang
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Radiation characteristics of cylindrical microstrip arrays
IEEE Antennas and Propagation Society International Symposium. 1999 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.99CH37010), 2003For microstrip arrays mounted on a cylindrical surface, several related studies have been reported, and most of the work emphasizes the design and characterization of N-element wraparound arrays (1/spl times/N arrays) for omnidirectional radiation in the roll plane of the cylindrical host.
null Gui-Bin Hsieh, null Kin-Lu Wong
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Seafloor mapping with a cylindrical array
The Journal of the Acoustical Society of America, 2017Seafloor mapping is conducted with different types of arrays. Single beam mapping systems are often constructed with piston arrays. Linear arrays are used for both side scan sonar and for multibeam echo sounders. These conventional approaches to seafloor mapping are typically constrained to a single observation of any one point on the seafloor for any ...
Glen Rice +2 more
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Cylindrical ultrasonic array for borehole applications
The Journal of the Acoustical Society of America, 2008A cylindrical ultrasonic array has been developed for operating environments that can reach extremes of 175 C and 20,000 psi. The array is a key component of the PharUSIT* (Phased Array Ultrasonic Transducer for Inspection of Tubing), a research demonstrator developed for borehole applications.
Kenneth Liang +4 more
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Tactical cylindrical active phased array radar
Proceedings of International Symposium on Phased Array Systems and Technology, 2002As aircraft and missiles have been successfully evolving both in mobility and RCS reduction, higher detection capability and higher search and track data-rates are required by air defence radar. This paper describes today's issues in air defence radar and discusses a cylindrical active phased array radar as the best solution to these issues ...
E. Kiuchi, I. Ueda
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Limited diffraction beams from cylindrical arrays
1996 IEEE Ultrasonics Symposium. Proceedings, 2002The authors propose to launch limited diffraction beams called focus wave mode (FWM) from a cylindrical array. Using this new array geometry, the launching scheme is greatly simplified compare to conventional planar arrays. One single independent generator is used to generate all the driving source signals.
D. Allexandre, M.R. Palmer
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Variable-focus cylindrical liquid lens array
SPIE Proceedings, 2013A variable-focus cylindrical liquid lens array based on two transparent liquids of different refractive index is demonstrated. An elastic membrane divides a transparent reservoir into two chambers. The two chambers are filled with liquid 1 and liquid 2, respectively, which are of different refractive index.
Wu-xiang Zhao +5 more
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Permalloy cylindrical submicron size dot arrays
Journal of Magnetism and Magnetic Materials, 1997Abstract Arrays of cylindrical permalloy dots of diameter varying from 88 to 200 nm were fabricated using high-resolution X-ray and electron beam lithography techniques. Reduction of the diameter induces a drastic modification of the magnetisation reversal process.
Corinne Miramond +4 more
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