For a dual-reflector,such as Cassegrain antenna,the total scattered field should be the phase summation of the diffracted and reflected fieldsfrom the mainreflector and subreflector.

• 对于卡塞格伦等型式的双反射器天线,总散射场应该是主、副面绕射场,副面镜面场和反射绕射场等各项的相位相加。