Results 11 to 20 of about 17,964 (305)
Asymptotic extraction approach for antennas in a multilayered spherical media [PDF]
, 2010 An efficient algorithm is introduced to enhance the convergence of dyadic Green's functions (DGF) in a layered spherical media where asymptotic expressions have been developed. The formulated expressions involve an infinite series of spherical eigenmodes
Khamas, S.K.
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Concentric circles and spiral configurations for large correlator arrays in radio astronomy [PDF]
, 2018 Aperture synthesis arrays are commonly used in radio astronomy to take images of radio point sources, with the planned Square Kilometre Array (SKA) being the most common example.
Abidin, Zamri Zainal +6 more
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Fabric equiangular spiral antenna [PDF]
2006 IEEE Antennas and Propagation Society International Symposium, 2006 In this paper, a fabric equiangular spiral has been shown to perform comparably to a conventional copper-clad laminate spiral of the same design. Although the fabric antenna was supported by a fairly lossy substrate, and the conductivity of the arms is less than that of copper, the effects of these loss mechanisms appear to be negligible.
J.A. Dobbins +6 more
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Sensors, 2021 An efficient near-to-far-field transformation (NTFFT) technique, wherein the near-field (NF) measurements are acquired along a planar spiral with a uniform step to make the control of the involved positioners easier, is developed in this article.
Francesco D’Agostino +5 more
doaj +1 more source
Review on Ultra-Wideband Phased Array Antennas
IEEE Access, 2021 Ultra-wideband (UWB) phased array antennas are essential for radar, communication, and Electronic Warfare (EW) applications. Systems can operate over wide-band coverage. The high gain systems require wide-band, wide-angle scanning, good radiation pattern,
Thokala Latha +3 more
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Computational Analysis of a Spiral Thermoelectric Nanoantenna for Solar Energy Harvesting Applications [PDF]
, 2014 Thermo-electrical nanoantennas have been proposed as an alternative option for conversion solar energy harvesting applications. In this work, the response of a spiral broadband antenna has been obtained from numerical and theoretical simulations ...
Alda, Javier +7 more
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Near-Field to Far-Field Transformation Techniques with Spiral Scannings: A Comprehensive Review
International Journal of Antennas and Propagation, 2014 An overview of the near-field-far-field (NF-FF) transformation techniques with innovative spiral scannings, useful to derive the radiation patterns of the antennas commonly employed in the modern wireless communication systems, is provided in this paper.
Renato Cicchetti +5 more
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Tunable negative permeability in a three-dimensional superconducting metamaterial [PDF]
, 2015 We report on highly tunable radio frequency (rf) characteristics of a low-loss and compact three dimensional (3D) metamaterial made of superconducting thin film spiral resonators. The rf transmission spectrum of a single element of the metamaterial shows
Anlage, Steven M. +3 more
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Sequentially rotated loop and spiral antenna arrays with a coplanar C‐figured feedline
Electronics Letters, 2023 Using the moment method, two array antennas are investigated to reveal the effects of different radiation elements on the array characteristics. Each array comprises four elements sequentially rotated by 90° and excited by a coplanar C‐figured feedline ...
Kazuhide Hirose +4 more
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Optimization of photomixers and antennas for continuous-wave terahertz emission [PDF]
, 2005 We have studied terahertz emission from interdigitated finger photomixers coupled to planar antenna structures. Using both pulsed and continuous-wave excitation, polarization measurements reveal that the antenna design dominates the properties of the
Baker, C. +7 more
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