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In this paper, dielectric ribbon waveguides (DRWs) are designed and characterized to work in the (90–140 GHz) and (140–220 GHz) frequency bands. High resistivity silicon (HR-silicon) due to its high transparency in these bands, and its low-cost fabrication process, were selected for the fabrication of these waveguides. The guided modes of DRW are studied using Marcatili and multi-line methods...
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