The CE10-0R640 from Marki Microwave is a Directional Coupler that operates from 0.6 to 40 GHz. This 10 dB coupler has a directivity of 22 dB and an insertion loss of less than 2.3 dB. It utilizes conductive paint applied on it to reduce EMI/RFI leakage and susceptibility. The coupler is available as both a three-port directional coupler and a four-port bidirectional coupler in a module that measures 5.10 x 0.69 x 0.5 inches and has SMA-female connectors. It is suitable for broadband return loss measurements, power leveling, and signal monitoring applications.