The QC-5D3G6G from PMI RF is a quadrature coupler that operates from 5.3 to 6 GHz. It provides a low insertion loss of 1 dB and an isolation of over 18 dB. It has a VSWR of 1.4:1 and is matched to 50 ohms. The coupler has an amplitude balance of ±0.7dB and a phase balance is ±5 degrees. It is available in a module with SMA male connectors that measures 1.25" x 0.75" x 0.33".