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.
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Kiseliov et al. (1998) studied this question.
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