CIRCULAR POLARIZING GRATING

摘要

PURPOSE:To facilitate the manufacture of a circular polarizing grating and to reduce its weight by weaving metallic wires with longitudinal or lateral threads made of nonmetallic fiber and setting and molding synthetic resin in the fabric into the polarizing grating. CONSTITUTION:A polarizing grating G is provided on both sides of a foamed material U in the same grating direction and the foamed material U uses a material with a low dielectric constant close to 1.0 such as foamed polyurethane and foamed polystyrene. The polarizing grating G is manufacture by sandwiching one sheet of fabric which operates as a susceptance element to radio waves between two sheets N of fabric made of only nonmetallic fiber and setting and molding the synthetic resin material P in them. The internal fabric has flexibility, the polarizing grating is formed in an optional shape. The fabric C is formed by weaving longitudinal threads and latitudinal threads 2 made of nonmetallic fiber and latitudinal threads 3 made of metallic wires together. The threads 1 and 3 are woven regularly at intervals determined properly according to the wavelength of an object electromagnetic wave.