Application Of The Diffracted Gaussian Beam Analysis Method In Terahertz Frequency

Compared with the microwave and infrared system,the Quasi-Optical technology,especially the application of Terahertz technology,has become increasingly widespread.Terahertz technology has a wide range of applications in the military and civilian aspects,such as communication,target detection,guidance,remote sensing,radio astronomy,and plasma diagnostics field.Nowadays,frequency resources are very important and receive the attention of scientists.There has already a trend to a higher frequency in the current science and technology development.The applications of Terahertz technology will be more comprehensive and wide-ranging in the future.Analysis methods of the Quasi-Optical system are Diffraction Analysis,Physical Optics,Geometrical Optics method and Mode Analysis and other categories.The design of Quasi-Optical network system is basically based on Geometrical Optics method.Because at the design stage,Geometrical Optics method requires simple,clear thinking.In the results of the simulation stage,the Physical Optical methods as well as some of the other integral method is able to obtain higher accuracy.But in the late validation stage,the amount and storage capacity of calculation are larger than others.The development of the Diffracted Gaussian Beam Analysis methods DGBA comes from Queen Mary,University of London(QMUL).It is an advanced method of calculation for the analysis of the Quasi-Optical system in millimeter wave.It is a combination of a modular Physical Optics method(PO),and the accurate and simple Geometric Optics method(GO).The power of DGBA,which combines the numerical efficiency of description and computational accuracy,lies in its modularity.The modularity makes DGBA easily interfaced with other method,Periodic method of Moments(PMM)for example.PMM is effective in Frequency Selective surface(FSS)analysis.And its calculation speed on millimeter wave band and Terahertz is more than 10 times faster compared with traditional Physical Optics method(GRASP).This paper mainly discusses and verifies the applicability of DGBA in Terahertz and the SiMatrix software which combines DGBA and PMM algorithm.First,from the point of the theoretical analysis and validation,there are two aspects.The first one is the coupling of the terahertz beam and Gaussian feed.And the other one is the propagation characteristics of these beams.This study provides a theoretical basis for Diffracted Gaussian Beam Analysis methods in the terahertz band.Secondly,from the preliminary conclusions of view,the combination of single-channel and dual-channel Quasi-Optical network system’s design and simulation as well as the results contrast provide more validation that the method can be extended to the Terahertz.And of SiMatrix software based on DGBA and PMM algorithm can have many applications in Terahertz band.