The MQH-3R510 from Marki Microwave is a 90 Degree Hybrid Coupler with Frequency 3.5 to 10 GHz, Insertion Loss 1.8 to 4 dB, 2 to 4 dB, Isolation 14 to 25 dB, Coupling 3 dB, Amplitude Balance ±0.4 to ±2 dB(Die), ±0.5 to ±2 dB(Connectorized). Tags: Die, Module with Connectors. More details for MQH-3R510 can be seen below.