Abstract
This paper presents the design of a compact Antipodal Vivaldi Antenna (AVA) with good performance for ultra-wideband (UWB) applications. The miniaturized AVA — 40 × 40 × 0.8 mm, its balanced feed structure and its mechanical ground support are described in detail. The simulated results show that the proposed AVA covers a bandwidth ranging from 4.73 to more than 22 GHz with a peak gain above 5 dBi for the highest frequencies. A prototype was built and its return loss was measured. The designed antenna is utilized in a direction finding (DF) system based on the amplitude-comparison monopulse technique. The calibration curves and the corresponding residual errors of the proposed system are derived. An RMS residual error lower than 2.5° is obtained over a range of 40°.
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