WR-15 Waveguide to Coaxial Adapters from Fairview Microwave are also known as waveguide to coax transitions. 1.85mm waveguide to coaxial adapters are in-stock and available for same day shipment. Fairview WR-15 Waveguide to Coaxial Adapters have a maximum frequency of 65 GHz and a max VSWR of 1.5. WR-15 Waveguide to Coaxial Adapters have a connector body material of passivated stainless steel.