The 555 Series from MI-Wave are Bidirectional Waveguide Couplers that operate from 26.5 to 110 GHz. They are available in 3, 6, 10, 20, 30 and 40 dB coupling values. These couplers have a directivity of 30 dB and a VSWR of up to 1.10:1. This series is available in waveguide sizes WR-34, WR-51, WR-62, WR-75 and WR-90.