Citations
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Journal ArticleDOI
Imaging antenna arrays
David B. Rutledge,M. Muha +1 more
TL;DR: In this article, a planar line antenna array and optical system for imaging has been developed by using a reverse-microscope optical configuration and a modified bow-tie antenna design, which eliminates the troublesome effects of substrate surface waves.
Journal ArticleDOI
Realizing 5G: Microwave Photonics for 5G Mobile Wireless Systems
Rod Waterhouse,Dalma Novack +1 more
TL;DR: The objective here is to open discussions about the optimal technologies for the implementing 5G networks and to determine whether their goals are achievable in the near future.
Journal ArticleDOI
A phased-array radiowave imager for studies of cosmic noise absorption
D. L. Detrick,T. J. Rosenberg +1 more
TL;DR: The IRIS system as discussed by the authors uses a 64-element dipole array, phased to produce 49 independent beams viewing an ionospheric area about 200 km square at 90 km altitude.
Dissertation
An investigation of a frequency diverse array
TL;DR: In this article, the authors present a novel concept for focusing an antenna beam pattern as a function of range, time, and angle, which results in more flexible beam scan options for phased array antennas than traditional phase shifter implementations.
Journal ArticleDOI
Degenerate mode band‐pass birdcage coil for accelerated parallel excitation
Vijayanand Alagappan,Vijayanand Alagappan,Juergen Nistler,Elfar Adalsteinsson,Elfar Adalsteinsson,Kawin Setsompop,Ulrich Fontius,Adam C. Zelinski,Markus Vester,Graham Wiggins,Franz Hebrank,Wolfgang Renz,Franz Schmitt,Lawrence L. Wald,Lawrence L. Wald +14 more
TL;DR: An eight‐rung, 3T degenerate birdcage coil was constructed and evaluated for accelerated parallel excitation of the head with eight independent excitation channels and the orthogonal basis set provided by the Butler matrix was found to be advantageous when an Orthogonal subset of these modes was used to mitigate B1 transmit inhomogeneities using parallelexcitation.
References
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Journal ArticleDOI
Multiple beams from linear arrays
J. Shelton,K. Kelleher +1 more
TL;DR: The problem of devising a passive RF transmission line feed system to provide independent multiple outputs from a linear array and the problem of finding applicable junctions more complex than the hybrid is considered.
Journal ArticleDOI
A theoretical limitation on the formation of lossless multiple beams in linear arrays
TL;DR: In this paper, the shape of the beams which can be formed from an equispaced array by such a feed matrix is not arbitrary, unless one is willing to accept losses in addition to normal plumbing losses.
Journal ArticleDOI
An RF Multiple Beam-Forming Technique
TL;DR: In this article, an RF beamforming matrix is described which forms simultaneous beams from an n-element array in a passive and theoretically lossless manner, and the principle of operation is explained using some simple matrix configuration.