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Antenna theory
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The article was published on 1982-01-01 and is currently open access. It has received 2324 citations till now.read more
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Journal ArticleDOI
High-impedance electromagnetic surfaces with a forbidden frequency band
TL;DR: In this paper, a new type of metallic structure has been developed that is characterized by having high surface impedance, which is analogous to a corrugated metal surface in which the corrugations have been folded up into lumped-circuit elements and distributed in a two-dimensional lattice.
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Spatially Sparse Precoding in Millimeter Wave MIMO Systems
TL;DR: This paper considers transmit precoding and receiver combining in mmWave systems with large antenna arrays and develops algorithms that accurately approximate optimal unconstrained precoders and combiners such that they can be implemented in low-cost RF hardware.
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Design of millimeter wave microstrip reflectarrays
TL;DR: In this paper, the theoretical modeling and practical design of millimeter wave reflectarrays using microstrip patch elements of variable size is discussed and a full-wave treatment of plane wave reflection from a uniform infinite array of microstrip patches is described and used to generate the required patch-design data and to calculate the radiation patterns of the reflectarray.
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Design, fabrication, and testing of double negative metamaterials
TL;DR: In this paper, the design, fabrication, and testing of several metamaterials that exhibit double negative medium properties at X band frequencies are reported, and the extraction of the effective permittivity and permeability for these metammaterials from reflection and transmission data at normal incidence is treated.
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Elastography: ultrasonic estimation and imaging of the elastic properties of tissues.
Jonathan Ophir,S.K. Alam,Brian S. Garra,Faouzi Kallel,Elisa E. Konofagou,Thomas A. Krouskop,Tomy Varghese +6 more
TL;DR: The strain filter formalism and its utility in understanding the noise performance of the elastographic process is given, as well as its use for various image improvements.