The WVR-1950B-55.2M01 from Wevercomm is a Band Stop Filter with Stopband Frequency 1.923 to 1.977 GHz, Bandwidth 54.8 MHz, Insertion Loss 2 dB, Rejection 40 dB Min @ 1922.6MHz to 1977.4MHz, VSWR 1.50:1. Tags: Module with Connectors, Cavity Filter, Notch Filter. More details for WVR-1950B-55.2M01 can be seen below.