It converts the operating TM11 mode to TE11mode and at the same time, reflects the TE11 wave.At last, Gaussian-like HE11 mode is output by a metal horn.

• 它将工作模式TM11模转换成TE11模的同时将TE11模反射回去，用普通的喇叭形成高斯波束发射输出。