The QH-51 from Cobham Signal & Control Solutions is a 90 Degree Hybrid Coupler with Frequency 7 to 12.4 GHz, Insertion Loss 0.35 dB, Isolation 17 dB, Coupling 3 dB, Coupling Variation ±.50 dB. Tags: Module with Connectors. More details for QH-51 can be seen below.