The RK3-180-544P-1.5G-S1 from MTS Systemtechnik GmbH is a 180 Degree Hybrid Coupler with Frequency 1000 to 1500 MHz, Average Power 20 W, Coupling 3 dB, Amplitude Balance ±0.1 to 0.2 dB, Phase Balance ±0.8 to 2.5 Degrees. Tags: Module with Connector. More details for RK3-180-544P-1.5G-S1 can be seen below.