Quantic PMI Model No. PCH-180-5R6G5R8G-SFF is a Hybrid Coupler with a frequency of 5.6 to 5.8 GHz and is operational from 5.4 to 5.9 GHz. It has an insertion loss of 0.5 dB, an isolation of 20 dB, an amplitude balance of ±0.3 dB, a phase balance of ±0.3°, and a VSWR of 1.3:1. This model has SMA female connectors and a size of 1.380" x 1.000" x 0.433".  https://www.pmi-rf.com/product-details/pch-180-5r6g5r8g-sff