Proceedings ArticleDOI
A candidate active antenna design for a low frequency radio telescope array
N. Paravastu,Brian C. Hicks,Paul S. Ray,W. C. Erickson +3 more
- pp 4493-4496
TLDR
In this paper, the fork antenna is compared to the big-blade antenna in terms of performance and power consumption, and it is shown through simulation and field measurement that fork antenna compares closely in performance to big-bladed antenna and is therefore a viable alternative to big blade antenna.Abstract:
The Long Wavelength Array (LWA), currently in the development stage, is a radio telescope array that will be constructed in New Mexico, USA over the next several years. It will consist of ~ 52 stations of ~ 256 cross-dipole antennas each, and will explore the Universe in the 20 - 80 MHz frequency band. The large number of antennas required for the LWA suggests that the antenna design must be kept simple in order to maintain a low station cost. The leading candidate LWA antenna is a "big blade" antenna consisting of crossed dipole elements made of sheet aluminum. The big blade antenna has been extensively characterized and shows potential for fulfilling the technical requirements for the LWA. However, their potentially prohibitive cost has necessitated the exploration of alternate, more affordable antenna topologies. In this paper, we present one such promising topology - the fork antenna. In the following sections, we show through simulation and field measurement that the fork antenna compares closely in performance to the big blade antenna and is therefore a viable alternative to the big blade antenna in the LWA project.read more
Citations
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Journal ArticleDOI
The Long Wavelength Array
Steven W. Ellingson,Tracy E. Clarke,A. S. Cohen,J. Craig,Namir E. Kassim,Ylva Pihlström,L. J. Rickard,G. B. Taylor +7 more
TL;DR: Notable engineering features of the LWA, demonstrated in this paper, include Galactic-noise limited active antennas and direct sampling digitization of the entire tuning range.
The Long Wavelength Array
Namir E. Kassim,Emil Polisensky,Tracy E. Clarke,Brian C. Hicks,P. C. Crane,K. P. Stewart,Paul S. Ray,K. W. Weiler,L. J. Rickard,T. J. W. Lazio,W. M. Lane,A. S. Cohen,Michael E. Nord,W. C. Erickson,Richard A. Perley +14 more
Journal ArticleDOI
A Simplified Method for Reducing Mutual Coupling Effects in Low Frequency Radio Telescope Phased Arrays
Aaron Kerkhoff,Hao Ling +1 more
TL;DR: In this paper, the authors proposed a new approach to reduce mutual coupling effects in large phased array antennas currently under development for use in low frequency radio astronomy and demonstrated that wire inverted-V dipole antennas can be designed with significantly reduced receive coupling over a wide range of frequencies and wave directions by proper selection of antenna element geometry and feed impedance.
Proceedings ArticleDOI
Implementation of a Digital Signal Processing subsystem for a Long Wavelength Array station
TL;DR: In this article, the authors describe the implementation of a Digital Signal Processing (DP) subsystem for a single Long Wavelength Array (LWA) station, which is a radio telescope that will consist of many phased array stations.
Proceedings ArticleDOI
Compact multiband VHF antenna for transient radio telescope
TL;DR: In this paper, a design of compact multiband VHF antenna for a transient radio telescope system is proposed by combining V-shape half-wavelength dipole, traps and parasitic elements.
References
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Proceedings ArticleDOI
Comparison of two candidate elements for a 30-90 MHz radio telescope array
Steven W. Ellingson,A. Kerkhoff +1 more
TL;DR: In this article, the authors compare two candidate element designs, and find that they come close to meeting the requirements of the long-wavelength array (LWA) with a 288 K preamplifier with 100/spl Omega/input impedance and 25 dB gain.