The 51ka-305A-dB-6-6 from Narda-ATM is a Waveguide Coupler with Frequency 18.3 to 20.2 GHz, Coupling 3, 6, 10, 20 or 30 dB, Directivity 30 to 40 dB. Tags: Broadwall Coupler, Multihole Coupler, Directional Coupler. More details for 51ka-305A-dB-6-6 can be seen below.