The A4258-6 from Atlantic Microwave is a Directional Coupler with Frequency 4 to 18 GHz, Coupling 6 dB, Coupling Variation ± 1 dB, Frequency Sensitivity ±0.50 dB, Directivity 12 to 15 dB. Tags: Module with Connectors. More details for A4258-6 can be seen below.