NDLI: Design and Construction of an Array of Vertically Oriented Bow-Tie Antennas for a New Generation of Radio Telescopes

Content Provider	IEEE Xplore Digital Library
Author	Arts, M.J. Smolders, A.B.
Copyright Year	1999
Description	Author affiliation: Netherlands Foundation for Research in Astronomy, P.O. Box 2, 7990 AA Dwingeloo, The Netherlands. E-mail: smolders@nfra.nl (Smolders, A.B.) \|\| Netherlands Foundation for Research in Astronomy, P.O. Box 2, 7990 AA Dwingeloo, The Netherlands. E-mail: arts@nfra.nl (Arts, M.J.)
Abstract	In this paper an array of vertically oriented bow-tie antennas is described. This array is part of the One Square Meter Array (OSMA): A demonstrator phased array system (receive only) with mixed RF and digital beamforming. OSMA consists of 64 active vertical bow-tie elements surrounded by 80 dummy (passive) elements. The scan performance of the array was measured and simulated. Using the mutual coupling coefficients the active reflection coefficient and scan loss were determined. For a grid of scan angles from ¿50 to 50 degrees (in two dimensions) the average scan loss as a function of frequency was determined. It became clear that the array has a 3:1 bandwidth with an average scan loss less than 1 dB. The radiation patterns of the elements were also measured. They were used to predict the array pattern. This was done for a uniform and a Taylor taper. The correspondence between predicted and ideal patterns is very good.
Starting Page	259
Ending Page	262
File Size	4920944
Page Count	4
File Format	PDF
DOI	10.1109/EUMA.1999.338487
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1999-10-05
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical design Antenna arrays Radio astronomy Phased arrays Radio frequency Array signal processing Antenna measurements Mutual coupling Optical reflection Bandwidth
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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