Agilent/HP / Step Attenuator / 8496B/001 dc to 18GHz 0 to 110dB / 10dB Step Insertion loss 0.6dB + 0.09dB/GHz Maximum SWR 1.5 to 8 GHz, 1.6 to 12.4 GHz, 1.9 to 18 GHz