Investigation of a new quasi-optical waveguide modeling method forbackward and forward scattering study in millimeter and submillimeterwave bands

摘要

In the method, the object under investigation is situated in aquasi-optical waveguide structure which presents a circular hollowdielectric waveguide (HDW) and the main waveguide mode, HE₁₁,scattering parameters are determined. The parameters are related to theobject under investigation obtaining RCS in a quite definite manner. TheHDW presents a remarkable combination of useful properties because it isa guiding, forming and filtering quasi-optical structure that allows oneto place sufficiently large (as compared with wavelength)nonuniformities in its waveguide channel. Owing to the properties, inconjunction with HE₁₁ mode field quasi-plane character andsome other HDW merits, it turned out to be possible to simulate theconditions for electromagnetic wave scattering by an object placed in acertain region inside the HDW that is close to the conditions existingwhen a uniform plane wave is scattered by the same object placed in freespace. Therefore, HDW plays in the QWM method the role of the maincomponent of a micro-compact range intended for the study of scatteringcharacteristics of various physical objects under laboratory conditionsin the short millimeter and submillimeter wave bands