Data set for publication Extremely wideband ridge gap waveguide-based 3-dB coupler using supershaped coupling apertures

This paper introduces a novel broadband 3-dB coupler based on ridge gap waveguide (RGW)technology designed using supershapes to achieve exceptional bandwidth while maintaining acompact footprint. By leveraging the superformula—a parametric model capable of generatingcomplex geometries with minimal computational effort-the proposed design enables efficientexploration of a wide design space. Furthermore, to ensure efficient excitation of the coupler acrossthe entire operational bandwidth two novel transitions from RGW to coaxial line and double-ridgewaveguide are designed. The proposed coupler achieves a fractional bandwidth of 75.8% over the 18–40 GHz range (covering both K and Ka bands), featuring a return loss better than 18 dB, a coupling levelof 3 ± 0.3 dB, isolation exceeding 22 dB, and a significantly compact footprint of 0.8λg—substantiallysmaller than conventional designs. Simulation and measurement results confirm the effectiveness ofthe proposed approach, demonstrating its suitability for high-performance broadband applications inmicrowave and millimeter-wave (mmWave) systems.