A dielectric lens antenna fed by a flexible dielectric waveguide at 160 GHz

Flexible antennas in radar applications enable the user to go around obstacles or detect targets at hidden places. In this paper, two elliptical lenses of different size made of high density polyethylene and stacked on a flexible dielectric waveguide are designed and measured from 140 GHz to 180 GHz. The feeding dielectric waveguide and the mode transition from metallic waveguide to dielectric waveguide was investigated with full wave simulations. The elliptical lenses were designed with a geometrical optics approach. The realized antennas have a gain larger than 24 dBi and 27 dBi and a maximum side lobe level below −15.8 dB.