Ray representation of the electromagnetic field in a circular hollow dielectric waveguide used as a facility for scattering measurements

A new ray representation of electromagnetic field inside a quasi-optical structure in the form of a circular hollow dielectric waveguide (HDW) is suggested, which permits, among other things, estimating the dimensions of the measurement area for the free-space scattering characteristics of an object that can be measured in the millimeter- and submillimeter-wave regions by putting the object into a circular HDW.