Broadband Differentially Fed Tapered Slot Antenna Array for Radio Astronomy Applications

Conference: EuCAP 2009 - 3rd European Conference on Antennas and Propagation
03/23/2009 - 03/27/2009 at Berlin, Germany

Proceedings: EuCAP 2009

Pages: 5Language: englishTyp: PDF

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Arts, Michel; Maaskant, Rob (Netherlands Institute for Radio Astronomy (ASTRON), P.O. Box 2, 7990 AA Dwingeloo, the Netherlands)
Lera Acedo, Eloy de; Vaate, Jan Geralt bij de (University of Cambridge, Rutherford Building, Cavendish Laboratory, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom)

This paper describes the preliminary design results of a differentially fed tapered slot antenna. Traditional unbalanced tapered slot antennas often employ a bilateral strip line feed, or a separate feed board, in combination with a potentially lossy radial stub and microstrip line (balun). In order to reduce the associated transmission line losses, a differentially fed tapered slot antenna is considered. Main focus is on the measurement procedure and the determination of the active reflection coefficient. The properties of the (undesired) common modes are also discussed. Finally, the effective area for broadside is determined and turned out to be larger than 80% of the physical aperture area of the array.