The APTQH-90-02000400-SMA from AmpliTech, Inc. is a 90 Degree Hybrid Coupler with Frequency 2 to 4 GHz, Average Power 50 W, Insertion Loss 3.2 dB, Isolation 19 to 23 dB, Coupling 3 dB. Tags: Module with Connectors. More details for APTQH-90-02000400-SMA can be seen below.