Substrate integrated waveguide (SIW) is a high-frequency transmission line that can provide excellent high-frequency performance on low-dielectric-constant substrate materials. To demonstrate the effectiveness of the technology, rectangular SIW (RSIW) was used to design and fabricate a SIW power divider, circulator, and coupler for use at frequencies from 4.0 to 6.5 GHz. In SIW, these components are readily implemented as planar circuits, with measured results of prototype circuits agreeing c
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