Results 61 to 70 of about 92,941 (196)
Atacama compact array antennas [PDF]
SPIE Proceedings, 2012 We report major performance test results of the Atacama Compact Array (ACA) 7-m and 12-m antennas of ALMA (Atacama Large Millimeter/submillimeter Array). The four major performances of the ACA antennas are all-sky pointing (to be not more than 2.0 arcsec), offset pointing (to be < 0.6 arcsec) surface accuracy (< 25(20) micrometer for 12(7)m ...
Saito, Masao +10 more
openaire +2 more sources
International Journal of Antennas and PropagationMicrostrip antenna arrays are proposed in this paper for the customer premise equipment (CPE) applications in the frequency range 1 (FR1) of the 5th generation (5 G) mobile networks. The proposed antenna arrays consist of three FR4 substrates.
Ting-Yi Huang, Yun-Jhang Lee
doaj +1 more source
Subarray partition based on sparse array weighted K‐means clustering
Electronics LettersThis paper introduces the subarray partition based on the sparse array weighted K‐means clustering method, which extends the conventional K‐means clustering method through the inclusion of a weight matrix approach. This matrix is derived by recording the
Jiayu Zhao +5 more
doaj +1 more source
Microstrip Patch Antennas Fed by Substrate Integrated Waveguide [PDF]
, 2013 Dizertační práce je zaměřena na výzkum mikropáskových flíčkových antén a anténních řad napájených vlnovodem integrovaným do substrátu (SIW). Využitím vlnovodu integrovaného do substrátu pro napájení mikropáskové flíčkové antény dochází ke kombinaci ...
Mikulášek, Tomáš
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Wireless communications with diffuse waves
, 2002 Diffuse, multiple-scattered waves can be very efficient for information transfer through disordered media, provided that antenna arrays are used for both transmission and reception of signals. Information capacity C of a communication channel between two
Skipetrov, S. E.
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A Wideband, Four-Element, All-Digital Beamforming System for Dense Aperture Arrays in Radio Astronomy [PDF]
, 2010 Densely-packed, all-digital aperture arrays form a key area of technology development required for the Square Kilometre Array (SKA) radio telescope. The design of real-time signal processing systems for digital aperture arrays is currently a central ...
Adami, Kristian Zarb +2 more
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, 1973 It is possible to design and construct simple, efficient microwave antenna, either linearly or circularly polarized, which should be useful in phased arrays. Mounted on thin dielectric substrate, it extends slightly above ground plane.
Howell, J. Q.
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Compressed Sensing Based Multi-User Millimeter Wave Systems: How Many Measurements Are Needed?
, 2015 Millimeter wave (mmWave) systems will likely employ directional beamforming with large antenna arrays at both the transmitters and receivers. Acquiring channel knowledge to design these beamformers, however, is challenging due to the large antenna arrays
Alkhateeb, Ahmed +2 more
core +1 more source
Analyzing the trade-offs: non-identical antenna array elements in wireless communication systems
Cogent EngineeringIn wireless communication systems, the design and optimization of antenna arrays play a crucial role in achieving desired performance metrics. Many constraints on optimizing antenna arrays to achieve minimum SLL, high Gain, and good impedance matching ...
Twahir Kazema, Bonny Mgawe
doaj +1 more source
Genetic Algorithm Optimization of a High-Directivity Microstrip Patch Antenna Having a Rectangular Profile [PDF]
, 2013 A single high-directivity microstrip patch antenna (MPA) having a rectangular profile, which can substitute a linear array is proposed. It is designed by using genetic algorithms with the advantage of not requiring a feeding network.
Anguera, J. +2 more
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