Design of mm-Wave Dielectric Lens Antenna for Liquid Level Gauge Radar

This paper presents a design of mm-wave dielectric lens antenna for liquid level gauge radar. The antenna consists of a conical horn antenna, a planar convex dielectric lens and an intermediate matching structure. The antenna is feed by a circular waveguide and simulated by FEKO. The simulation results show that the lens antenna has ideal gain and beam width, this feature can be further improved by changing the position of the feed. The millimeter-wave dielectric lens antenna designed for level gauge radar has a lens diameter of 73.1mm, a beam width of 3.7 degrees, and a gain of 31.3dBi, which can well meet the needs of mm-wave radar for narrow viewing Angle and long distance ranging.