Pasternack waveguide adapters are designed to connect or transition a coaxial cable to a waveguide transmission line. Our waveguides are low loss transmission lines capable of handling high power with high isolation. Our waveguide adapters are commonly used for millimeter wave communications requiring low loss capabilities, typically not possible with coaxial cables only. Common applications for these waveguide adapters include radar systems for their high power capabilities, antenna feed networks for low loss and phase accuracy and test labs.