A method to obtain maximum coupling fundamental Gaussian beam of corrugated feed horn based on fast inverse diffraction algorithm

A method to obtain the maximum coupling fundamental Gaussian beam mode of corrugated feed horn based on fast inverse diffraction algorithm is proposed. The inverse diffraction (O.K. Ersoy, 2007) was employed for field reconstruction by calculating the backward propagation of a given diffraction field. Both the fast-Fourier-transform diffraction integration (FFT-DI) (F. Shen and A. Wang, 2006) and diffracted Gaussian beam analysis (DGBA) (C. Ricckmann et al., 2000) are employed for fast inverse diffraction calculation. An outline of the signal processing about the experimental measured data is presented, along with the comparison of the designed maximum coupling fundamental Gaussian beam mode and the calculated maximum coupling fundamental Gaussian beam mode coupling to the measured data separately, which shows that the later is the optimum choice.