Menu
Home
People
Places
Arts
History
Plants & Animals
Science
Life & Culture
Technology
Reference.org
Extended hemispherical lens
open-in-new
<p>The extended hemispherical lens is a commonly used <a href="/facts/Lens_(optics)/ejlH6n5c">lens</a> for <a href="/facts/Extremely_high_frequency/l28Grdmp">millimeter-wave electromagnetic radiation</a>. Such lenses are typically fabricated from <a href="/facts/Dielectric_material/PnVt9P2G">dielectric materials</a> such as <a href="/facts/Teflon/jesBNXKq">Teflon</a> or <a href="/facts/Silicon/cgWx0hdr">silicon</a>. The geometry consists of a <a href="/facts/Sphere/jywYLNM2">hemisphere</a> of radius R on a cylinder of length L, with the same radius. </p>