Model WMC-0.3-8-20dB-S from Werbel Microwave is a directional coupler that covers 300 MHz to 8 GHz with broadband flat coupling response, high directivity, and excellent return loss performance.  Coupling flatness ±0.6 dB typical.  Directivity 25dB typical.  Return loss 26dB typical.  Insertion loss 0.5dB typical.  Enclosure measures 6.00 x 0.73 x 0.50 inches with threaded mounting holes.  SMA Female connectors.  Device is RoHS complaint.