The WRCD20-1948-1950-1970-1972-40-4 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 1.95 to 1.97 GHz, Bandwidth 20 MHz, Insertion Loss 2 to 3.5 dB, Rejection 40 dB, VSWR 1.50:1. Tags: Module with Connectors, Cavity Filter. More details for WRCD20-1948-1950-1970-1972-40-4 can be seen below.