Abstract
This paper presents an ultra-wideband (UWB) dielectric rod antenna working at L-band to C-band. The antenna consists of a planar UWB circular slot antenna, a dielectric rod antenna, a reflector, and a housing. The planar UWB circular slot antenna acts as the feed structure for the dielectric rod antenna. The HE <inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">11</inf> mode is excited in the dielectric rod antenna. The reflector is located at the other side of the planar to increase the antenna directivity. The proposed antenna achieves -10 dB impedance bandwidths of 2.22 GHz-8.45 GHz (FBW=116 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">%</sup> ). The antenna gain is higher than 7 dBi and the total efficiency is higher than 70% across the operating frequency band, and radiation patterns are stable. The antenna is suitable for ground penetrating radar.
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