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Study and Design of a Differentially-Fed Tapered Slot Antenna Array

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6 Author(s)
de Lera Acedo, E. ; Astron. Centre of Yebes, Nat. Astron. Obs. of Spain, Guadalajara, Spain ; Garcia, E. ; Gonzalez-Posadas, V. ; Vazquez-Roy, J.L.
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The results of a parametric study and design of an ultrawideband dual-polarized array of differentially-fed tapered slot antenna elements are presented. We examine arrays of bunny-ear antennas and discuss the capabilities and limitations of differential antenna technology. As we focus on radio astronomical applications, the absence of a balancing-feed circuit not only reduces the first-stage noise contribution associated to losses in the feed, but also leads to a cost reduction. Common-modes are supported by the antenna structure when a third conductor is present, such as a ground plane. We demonstrate that anomalies may occur in the differential-mode scan impedance. Knowledge of both types of scan impedances, differential and common mode, is required to properly design differential LNAs and to achieve optimal receiver sensitivity. A compromise solution is proposed based on the partial suppression of the undesired common-mode currents through a (low loss) balancing-dissipation technique. A fully steerable design up to 45?? in both principal planes is achieved.

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Antennas and Propagation, IEEE Transactions on  (Volume:58 ,  Issue: 1 )