Photo-conductive antenna for material analysis in terahertz spectral range, has lens array comprising flat-convex lenses, whose focal points are found at surface between beginnings of spiral arms in center of antenna rows

摘要

The antenna has an array of spiral antennae with spiral arms (11, 12, 21, 22) and inter-digital electrical feeders (3, 4). The spiral antenna array is illuminated with laser light (6) using a lens array (5). The entire spiral antenna array comprises two different forms of spiral antennae arranged in antenna rows (1, 2). The spiral antennae of the rows possess same winding directions and different numbers of windings. Focal points of individual flat-convex lenses of the lens array are found at a surface between beginnings of the spiral arms in a center of the antenna rows. The lens array consists of glass or organic material.