Coupling characteristics of multiple kinds of bending waveguides of NRD-waveguides

With regard to the coupling characteristics of multiple kinds of bending wa veguides of NRD-waveguides with different curvature radii, a novel and gene ral analysis method was presented. When the coupling structures become the asymmetric (coupling of a straight waveguide with a bending one) or the sym metric (coupling between two bending waveguides of the same curvature radii ) structures, the new method can be simplified, respectively, to be in full accordance with the reported results. Experiments were done at 60GHz for t he frequency responses and the bandwidth characteristics of couplers by usi ng bending waveguides with various curvature radii. And the generality and validity of the method were verified.