The C9639 from Werlatone Inc is a 4-Port Bi-Directional coupler that operates from 2500 to 6000 MHz. This 20 dB coupler has a directivity of over 18 dB, an insertion loss of less than 0.4 dB and a VSWR of 1.25:1. It can handle up to 100 watts of power. The coupler is available in connectorized package that measures 1.1 x 0.75 x 0.48 inches with SMA connectors and is ideal for Military and EMC Testing applications.