A Study on a Low-Loss Connector for Converting a Dielectric Waveguide to a Rectangular Waveguide

The demand for high-speed and high-capacity communication and radar systems operating at frequencies above millimeter waves has increased. Dielectric waveguides have been studied as low-loss, flexible transmission lines, but loss occurs when converting them to coaxial connectors or rectangular waveguides. This paper presents a low-loss connector for converting between a dielectric waveguide and a rectangular waveguide at 28 GHz. The characteristics of the dielectric waveguide were measured at various lengths and compared with simulation results. The proposed connector achieved S21 of approximately -0.15 dB around 28 GHz, indicating its effectiveness in attaining low-loss conversion.