The CBF-11A-500 SQ from Crane Aerospace & Electronics is a Directional Coupler with Frequency 10 to 1000 MHz, Coupling 11 dB, Coupling Variation ±1 dB, Frequency Sensitivity ±1 dB, Directivity 13 dB. Tags: Flat Pack. More details for CBF-11A-500 SQ can be seen below.