Offset characteristics of elliptic fresnel-zone-plate lens

Fresnel-zone-plate lens (FZPL) is an application of Huygens-Fresnel's principle. By placing alternate transparent and non-transparent part, waves of opposite phases are reflected on the non-transparent part, while wave of same phases are collected by letting pass through the transparent part. FZPL can be used for satellite TV receptions [1],[2],[3] and radio telescopes [4]. The paper treats the FZPL with a conical horn as receiving antenna by using Kirchhoff's diffraction integral formula and evaluates distributions of power flux density over the conical horn and receiving powers of the FZPL with the conical horn. By receiving the Broadcasting satellite signal, the receiving power of the converter is measured around the focal point.