ANGULAR SPACIAL FILTER

摘要

PURPOSE: An angular spatial filter is provided to transmit and receive linear polarization and circular polarization by transmitting and restricting a transmitting signal and a receiving signal according to angles of the transmitting and the receiving signals. CONSTITUTION: An angular spatial filter includes a first dielectric film, a second dielectric film, a third dielectric film, a first form layer, and a second form layer. The first form layer(23a) is formed between the first dielectric film(22a) and the second dielectric film(22b) in order to form a gap between the first dielectric film and the second dielectric film. The second form layer(23b) is formed between the second dielectric film and the third dielectric film(22c). A first angular filter layer is formed with the first dielectric layer, the first form layer, and the second dielectric film. A second angular filter layer is formed with the second dielectric film, the second form layer, and the third dielectric film.