WR-34 Waveguide to Coaxial Adapters from Fairview Microwave are also known as waveguide to coax transitions. 2.9mm waveguide to coaxial adapters are in-stock and available for same day shipment. Fairview WR-34 Waveguide to Coaxial Adapters have a maximum frequency of 33 GHz and a max VSWR of 1.25. WR-34 Waveguide to Coaxial Adapters have connector body material of passivated stainless steel.