Journal ArticleDOI
Antenna Loss and Receiving Efficiency for Mutually Coupled Arrays
Junming Diao,Karl F. Warnick +1 more
TLDR
In this article, the authors studied the antenna loss and receiving efficiency for single and multi-array antennas and focal plane phased array feeds, and they showed that the array antenna loss can be significantly increased by mutual coupling, particularly for beams with a large scan angle.Abstract:
For phased arrays used in satellite communications and radio astronomy, high sensitivity is required, and minimizing antenna losses is critical. Losses for single antennas can be minimized using high conductivity materials. It is less well understood that loss for array antennas is also influenced by mutual coupling between array elements and the beamformer weights applied to the signal from each element. In this paper, we study the antenna loss and receiving efficiency for phased array antennas and focal plane phased array feeds. To better elucidate the physics of array antenna loss related to mutual coupling and beamformer weights, losses for a coupled array can be lumped into an array effective resistance similar to the loss resistance of an equivalent single antenna. Numerical results show that although the antenna loss for a single isolated array element is low, the array antenna loss can be significantly increased by mutual coupling, particularly for beams with a large scan angle.read more
Citations
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Book
Phased Arrays for Radio Astronomy, Remote Sensing, and Satellite Communications
TL;DR: Find a modern approach to the analysis, modeling and design of high sensitivity phased arrays by combining network theory, numerical methods and computational electromagnetic simulation techniques to enable full system analysis and design optimization.
Journal ArticleDOI
Ultra-Wideband Microwave Absorption by Design and Optimization of Metasurface Salisbury Screen
TL;DR: An ultra-wideband electromagnetic (EM) absorber based on the concept of metasurface Salisbury screen (MSS), which features low profile, light weight, simple configuration, and robust angular performance, exhibiting promising potentials for many practical applications.
Journal ArticleDOI
Sidelobe Level and Aperture Efficiency Optimization for Tiled Aperiodic Array Antennas
TL;DR: To reduce the complexity of the large aperiodic array design problem, the use of discrete rotated tiles with element positions and tile orientations optimized to minimize peak sidelobe level (PSLL) is studied.
Journal ArticleDOI
Performance of a Highly Sensitive, 19-element, Dual-polarization, Cryogenic L-band Phased-array Feed on the Green Bank Telescope
D. Anish Roshi,William Shillue,B. Simon,Karl F. Warnick,Brian D. Jeffs,Daniel J. Pisano,Richard M. Prestage,S. White,J. R. Fisher,Matthew A. Morgan,R. Black,M. Burnett,Junming Diao,M. Ruzindana,V. van Tonder,L. Hawkins,P. Marganian,T. Chamberlin,Jason Ray,Nickolas M. Pingel,Kaustubh Rajwade,Duncan R. Lorimer,Akshaya Rane,Jason J. Castro,Wavley M. Groves,L. Jensen,J. D. Nelson,Tod A. Boyd,Anthony Beasley +28 more
TL;DR: In this paper, a new 1.4 GHz 19-element, dual-polarization, cryogenic phased array feed (PAF) radio astronomy receiver has been developed for the Robert C. Byrd Green Bank Telescope (GBT) as part of FLAG (Focal L-band Array for the GBT) project.
Journal ArticleDOI
Multiple-Beam Focal-Plane Dual-Band Fabry–Pérot Cavity Antenna With Reduced Beam Degradation
TL;DR: In this article, a dual-band Fabry-Perot cavity antenna (FPCA) is proposed for single-feed per-beam satellite applications, which uses only one double-sided printed frequency-selective surface (FSS) to form the dualband FPCA, and it is fed through a novel arrangement of double-layer slots in the FOCA-printed ground plane.
References
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Journal ArticleDOI
An ultrawideband CMOS low-noise amplifier for 3.1-10.6-GHz wireless receivers
TL;DR: An ultrawideband 3.1-10.6-GHz low-noise amplifier employing an input three-section band-pass Chebyshev filter using a 0.18-/spl mu/m CMOS process achieves a power gain of 9.3 dB with an input match of -10 dB over the band.
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Cryogenic 2–13 GHz Eleven Feed for Reflector Antennas in Future Wideband Radio Telescopes
Jian Yang,Miroslav Pantaleev,Per-Simon Kildal,Benjamin Klein,Yogesh B. Karandikar,Leif Helldner,Niklas Wadefalk,Christopher Beaudoin +7 more
TL;DR: In this paper, the authors present the system design of a cryogenic 2-13 GHz feed with emphasis on its application in future wide-band radio telescope systems, and a great deal of simulated and measured results are presented throughout this paper, including the electrical, mechanical and cryogenic performance, and an assessment of the system noise temperature.
Journal ArticleDOI
Minimizing the Noise Penalty Due to Mutual Coupling for a Receiving Array
TL;DR: For non-beamforming applications such as multiple input multiple output communications, it is shown that noise performance for coupled arrays can be quantified using the spectrum of an equivalent receiver noise temperature correlation matrix.
Journal ArticleDOI
Equivalent System Representation to Model the Beam Sensitivity of Receiving Antenna Arrays
TL;DR: It is demonstrated that the beam sensitivity of an antenna array receiving system can be analyzed by using an equivalent single-channel receiver model, which considers a four-element actively beamformed dipole array with strongly coupled antenna elements causing significant noise coupling effects.
Journal ArticleDOI
Decoupling Efficiency of a Wideband Vivaldi Focal Plane Array Feeding a Reflector Antenna
TL;DR: In this article, the decoupling efficiency of a Vivaldi element FPA operating between 2.3 and 7 GHz was evaluated by using measured S -parameters between all element ports.