Results 241 to 250 of about 946,560 (297)
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The Journal of the Acoustical Society of America, 1981
A cylindrical array radiator that reduces the intensity of energy radiatedn undesirable directions. The radiator is constructed so that vertical staves placed on the face of a cylinder are staggered in the vertical direction by a predetermined distance to cancel energy in the undesirable directions.
Richard L. Rolleigh +2 more
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A cylindrical array radiator that reduces the intensity of energy radiatedn undesirable directions. The radiator is constructed so that vertical staves placed on the face of a cylinder are staggered in the vertical direction by a predetermined distance to cancel energy in the undesirable directions.
Richard L. Rolleigh +2 more
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The Journal of the Acoustical Society of America, 1989
A cylindrical array employs rectangular planar array segments which extend in the axial direction when assembled on a cylindrical conducting plate having flat longitudinal portions to which the planar array segments are attached. Each planar array segment comprises two columns of planar transducer elements with each column extending in the axial ...
Stanley L. Ehrlich, George G. Gray
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A cylindrical array employs rectangular planar array segments which extend in the axial direction when assembled on a cylindrical conducting plate having flat longitudinal portions to which the planar array segments are attached. Each planar array segment comprises two columns of planar transducer elements with each column extending in the axial ...
Stanley L. Ehrlich, George G. Gray
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Array gain for a cylindrical array with baffle scatter effects
The Journal of the Acoustical Society of America, 2007Cylindrical arrays used in sonar for passive underwater surveillance often have sensors surrounding a cylindrical metal baffle. In some operational sonars, the phones in each stave (i.e., each line of phones aligned with the cylinder axis) are hardwired together so that the array is equivalent to a baffled circular array of directional elements, where ...
Derek C, Bertilone +2 more
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CAD of multilayer conformal cylindrical arrays
IEEE Antennas and Propagation Society International Symposium. 2001 Digest. Held in conjunction with: USNC/URSI National Radio Science Meeting (Cat. No.01CH37229), 2002The new trends in the communication market are demanding wider bandwidths and consequently higher frequencies and higher bit rates. The traditional hardware development, based on the manufacture and measurement of test components, is too expensive and time consuming.
Gerini, G., Zappelli, L.
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Experimental adaptive cylindrical array
1999 IEEE Aerospace Conference. Proceedings (Cat. No.99TH8403), 1999An adaptive antenna places nulls in its antenna pattern in the direction of the interfering sources. Adaptive antennas are a subset of smart antennas, and have received considerable interest in the recent wireless revolution. This paper presents a successful application of a genetic algorithm with an experimental antenna for placing a null in the ...
R.L. Haupt, H. Southall
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Numerical synthesis of cylindrical arrays
2012 6th International Conference on Ultrawideband and Ultrashort Impulse Signals, 2012The authors propose a synthesis method for cylindrical arrays. This method allows the calculation of the required amplitude-phase distribution within a given active sector of the antenna array, taking into account the directional properties of the radiating elements.
A. G. Romanovich, A. A. Kalinin
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Cylindrical nearfield calibration array
The Journal of the Acoustical Society of America, 1974The planar nearfield calibration array (NFCA) has previously been used to determine the farfield radiation of underwater transducers from nearfield measurements. We consider here a cylindrical NFCA constructed from a single line of suitably shaded reciprocal hydrophones.
A. L. Van Buren, W. James Trott
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Cylindrical Antennas and Arrays
2002Cylindrical arrays lie at the heart of the antenna systems of most major radio communication systems, including broadcasting networks, cellular 'phone systems and radar. In this book, the authors present practical theoretical methods for determining current distributions, input admittances and field patterns of a wide variety of cylindrical antennas ...
Ronold W. P. King +2 more
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Sparse Cylindrical Sonar Arrays
IEEE Journal of Oceanic Engineering, 2008Sparse arrays offer a means for reducing the cost and complexity of beamforming systems. Most of the work in the literature has focused on sparse linear arrays with isotropic transducer elements, which simplifies analysis greatly. In this paper, we will focus on multibeam cylindrical arrays using highly directive elements for use in fishery ...
J.E. Kirkebo, A. Austeng
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Compressive beamforming on a cylindrical array
Journal of the Acoustical Society of America, 2016Previously, we presented subarray compressive beamforming for Doppler sensitive midfrequency active sonar on a cylindrical array, focusing on practical application for mitigating Doppler spreading caused by sidelobes and the width of the main lobe [J. Acoust. Soc. Am. 139, 2050 (2016)].
Charles F. Gaumond +2 more
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