A dielectric antenna such as a dielectric rod antenna is a surface-wave antenna in which an end-fire radiation pattern is produced by propagation of a surface wave on a tapered dielectric rod. Dielectric rod antennas provide significant performance advantages and are low cost alternatives to free space high-gain antennas at millimeter-wave frequencies and the higher end frequencies of the microwave band. Conventional dielectric antennas required for radar level gauging do not withstand high temperatures. Additionally, such antennas must be installed via small tank nozzles which can affect gain, return loss, and side lobes over the radar bandwidth issues.
Based on the foregoing, it is believed that a need exists for an improved dielectric hollow antenna, which will be described in greater detail herein.