Scan independent array for circular polarization reception and transmission

摘要

An antenna includes first and second arrays spaced apart by a dielectric slab having a predetermined thickness, each of the first and second arrays provided from antenna elements having a linear polarization with the antenna elements in said first array disposed orthogonally to the antenna elements in said second array. The antenna further includes a feed circuit coupled to said first and second antenna arrays to provide said first and second antenna arrays having a phase relationship such that the antenna receives and transmits signals having circular polarization and dielectric material having differing characteristics for providing an impedance transformation that varies with scan angle in accordance with the a scan impedance of said antenna thereby providing the antenna having a scan impedance which is substantially the same over a scan sector while at the same time preserving the response characteristic of the antenna to signals having circular polarization.