Model WMC-6-18-20dB-S (formerly known as C-1806-20) from Werbel Microwave is a directional coupler that covers 6 GHz to 18 GHz with broadband flat coupling response, high directivity, and excellent return loss performance.  Small enclosure measures just 1.00 x 0.60 x 0.38 inches with SMA-Female connectors.  The device is RoHS compliant.  Typical coupling ripple performance is ±0.30 dB and is the result of Werbel Microwave’s specially engineered coupling structure, which provides high accuracy in measurements.  Insertion loss 0.57dB typical.  Directivity 16dB typical.  Return loss 20dB typical.  The device covers X band and Ku band and may be built using lead solder, if required, on special order, as such to mitigate tin whiskers.  Such reliability efforts are vital to the support of military applications.  The product is designed, assembled, and tested in the USA.