The CC 18-BQB-(***-***)-B-(**) from The Waveguide Solution is a Waveguide Coupler with Frequency 12.4 to 18 GHz, Coupling 20 dB, 30 dB, 40 dB, Directivity 10 dB to 20 dB. Tags: Crossguide Coupler. More details for CC 18-BQB-(***-***)-B-(**) can be seen below.