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We demonstrate an air-core single-mode hollow waveguide that uses Braggreflector structures in place of the vertical metal walls of the standardrectangular waveguide or via holes of the so-called substrate integratedwaveguide. The high-order modes in the waveguide are substantially suppressedby a modal-filtering effect, making the waveguide operate in the fundamentalmode over more than one octave. Numerical simulations show that the propagationloss of the proposed waveguide can be lower than that of classic hollowmetallic rectangular waveguides at terahertz frequencies, benefiting from asignificant reduction in Ohmic loss. To facilitate fabrication andcharacterization, a proof-of-concept 20 to 45 GHz waveguide is demonstrated,which verifies the properties and advantages of the proposed waveguide. A zerogroup-velocity dispersion point is observed at near the middle of the operatingband. This work offers a step towards a novel hybrid transmission-line mediumthat can be used in a variety of functional components for broadbandmillimeter-wave and terahertz applications.

Substrate Integrated Bragg Waveguide: an Octave-bandwidth Single-mode Functional Transmission-Line for Millimeter-Wave and Terahertz Applications