Design method for offset shaped dual-reflector antenna with an elliptical aperture of low cross-polarisation characteristics

The paper presents a design method for an offset shaped dual-reflector ante nna (OSDRA) with an elliptical aperture of low crosspolarisation characteri stics. This method isa dual-reflector synthesis based on a reflector shapin g method using reflector shaping functions and is applied to attain low cro ss-polarisation characteristics for the OSDRA. The initial values for the r eflector shaping are explicitly determined by a reflector system configurat ion transformation technique. This design method has been verified through measurement of an elliptical aperture antenna for a satellite news gatherin g system and a very small aperture terminal in the Ku band.