The CD10-0106 from Marki Microwave is a dual directional coupler that operates from 0.8 GHz to 6.3 GHz. This model has an ultra-high directivity of 25 dB, coupling value of 10 dB (coupling can be customized), insertion loss up to 2.4 dB and a low VSWR under 1.28:1. The multisection tri-plate stripline design exhibits excellent coupling flatness and VSWR at all ports. Ultra high directivity allows them to be used for reflectometry (return loss) measurements and level monitoring. The coupler is available in a module with SMA connectors.