Abstract
In recent years, studies about miniaturization of wideband antennas had become popular with rapid development of antenna design technologies. Vivaldi antenna is one of these antennas which can be used in different areas such as microwave imaging, antenna arrays, ground penetrating radar applications. In this paper it is intended to approach with a novel method to reduce dimensions of Vivaldi Antennas because of its advantages such as simple configuration, wide bandwidth characteristics, low profile and low cost at fabrication process. Unlike traditional forms of Vivaldi Antennas it is used asymmetrical curves in this study. These curves have a different exponential coefficient to make the antenna have an asymmetrical shape. In this study the simulation results of the designed structure and a Coplanar Vivaldi Antenna were compared and the designed antenna showed similar characteristics. To verify the results a prototype of the Asymmetrical Vivaldi Antenna was fabricated on FR4 substrate with 4.6 dielectric constant. Measurement results illustrated that return loss of the designed antenna is below -10dB between 0.177GHz and 2.74GHz frequencies and the antenna have 93% fractional bandwidth. The measurement results match simulation results. Wideband frequency range, simple configuration andreduced dimensions make the designed antenna a good candidate for wideband antenna applications in future.
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