An Ultra-Wideband Dielectric Rod Antenna

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 HE11 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%). 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.