The HJK-4R-29G from Crane Aerospace & Electronics is a 180 Degree Hybrid Coupler with Frequency 18 to 40 GHz, Average Power 1 W, Coupling -3 dB, Amplitude Balance 1.5 dB, Phase Balance ±12 Degrees. Tags: Module with Connectors. More details for HJK-4R-29G can be seen below.