FOCUSING BEAM FEEDING SYSTEM EMPLOYING FOUR REFLECTING MIRRORS

摘要

PROBLEM TO BE SOLVED: To obtain a focusing beam feeding system employing 4 reflecting mirrors, that has an excellent cross polarization characteristic by canceling cross polarization caused by the asymmetry of focusing reflecting mirrors with each other. SOLUTION: A ray emitted along a center axis of a primary radiator 1 is made incident sequentially onto a 1st focusing reflecting mirror 2, a 2nd focusing reflecting mirror 3, a 3rd focusing reflecting mirror 4 and a 4th focusing reflecting mirror 5, the ray propagated through a path between the 2nd focusing reflecting mirror 3 and the 3rd focusing reflecting mirror 4 is in crossing with a horizontal plane rotary axis of an antenna sub reflecting mirror 106 and concave mirrors are employed for the 1st-3rd focusing reflecting mirrors.