The SWD-402040H-28-DB from ERAVANT is a Waveguide Coupler with Frequency 26.5 to 40 GHz, Coupling 20 dB (Reverse), 40 dB (Forward), Directivity 40 dB, Insertion Loss 1 dB. Tags: Dual Directional Coupler. More details for SWD-402040H-28-DB can be seen below.