Gaussian mode analysis of THz horn using CST Microwave Studio

This paper presents the theoretical investigation done in analysis of the Gaussian modes of the rectangular pyramidal horn at 0.17THz or 170GHz by using CST Microwave Studio to assess their generated modes. The results revealed the generation of combination of TEM_0,0 and TEM_2,0 mode. Using the resultant generated TEM mode, an alumina RF window at 170GHz was characterized via free space test setup. On the basis of above analysis it is concluded that horn antenna has harmonics as its dominant mode and not the fundamental mode. It produces a non-gaussian mode.