Radio Frequency Attenuators One high-frequency DC-18GHz 2W SMA coaxial attenuator with 2dB, 3dB, 4dB, 5dB, 6dB, 7dB, 8dB, 9dB, 10dB, 11dB, 12dB, 15dB, 20dB, 30dB, and 40dB settings.