The WRCT40-2144-2145-2165-2166-50-4 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 2.145 to 2.165 GHz, Bandwidth 20 MHz, Insertion Loss 3.5 to 6.5 dB, Rejection 50 dB, VSWR 1.50:1. Tags: Module with Connectors, Cavity Filter. More details for WRCT40-2144-2145-2165-2166-50-4 can be seen below.