Waveguide to Coaxial Adapters Adapts waveguide transmission lines to coaxial. Suncoast Microwave offers various sizes of waveguide to coaxial adapters. These adapters cover the frequency spectrum from WR430 (1.70-2.60 GHz) to WR28 (26.5-40.0 GHz). The adapters come with various connector styles including; sma, type "n" and "k" type. Most sizes are tuned to a standard maximum vswr of 1.25:1, and better vswr performance can be achieved over a reduced bandwidth. Suncoast Micrwave also offers several types of waveguide to waveguide transitions. These are used for overlapping frequency bands, and changing the size of the waveguide. Please contact us for your requirements. SUNCOAST MICROWAVE, INC. Return to home page.