SWD-0640H-42-SB is a K band, three-port waveguide directional coupler that delivers a 6 dB nominal coupling level and 30 dB minimum directivity across the full waveguide band from 18 to 26.5 GHz. The three-port coupler uses a traditional multi-hole and split block design to achieve a flat coupling level, high directivity, and low insertion loss. The interfaces of the coupler are WR-42 waveguides with UG-595/U flanges. Other coupling levels are available under different model numbers.