RDP 50Ω SMD Diplexer Mini-Circuits RDP 50Ω SMD Diplexer is a low-pass + high-pass combination device with low insertion loss and high stopband insertion loss. A low pass port is designed for DC to 20MHz, and a high pass port is designed for 950MHz to 2150MHz. This diplexer can be used for high-performance applications including pass, IF, pilot carrier or clock synchronizing signal, SATCOM modems, air-traffic control, and other multi-band radio systems.