Permittivity measurements for dielectric lens and dielectric rod antenna designs

For dielectric materials being often utilized in quasi-optical components, the permittivity was evaluated by free-space method in W-band. The obtained permittivity value was applied to designing of low aberration large aperture aspheric dielectric lens and dielectric waveguide rod antenna. These components composed the antenna system for the passive radiometric imaging in 90-100 GHz frequency range. This antenna system was experimentally demonstrated to successfully detect and recognize the metallic weapon hidden under outer clothing.