The S143-WR137 from Unique Broadband Systems is a Waveguide Coupler with Frequency 5.85 to 8.2 GHz, Coupling 6 dB, 10 dB, 20 dB, 30 dB, 40 dB, 50 dB, Directivity 35 dB. Tags: Directional Coupler, Broadwall Coupler. More details for S143-WR137 can be seen below.