Narda Model 23696 is a 2-4 GHz, 6 dB directional coupler with SMA female connectors.

A similar model is Narda Model 4013C-6.

Coupling Nominal: 6 dB +/- 1.00 dB
Frequency Sensitivity: +/-0.60 dB
Insertion Loss
   Excluding Coupled Power: 0.20 dB
   True: 1.80 dB
Minimum Directivity: 22 dB
VSWR: 1.15
Power
   Average Incident (Watts): 50 
   Average Reflected (Watts): 2
   Peak (kW): 3