The WRCT40-2151.7-2152.5-2157.5-2158.3-50-4 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 2.1525 to 2.1575 GHz, Bandwidth 5 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 WRCT40-2151.7-2152.5-2157.5-2158.3-50-4 can be seen below.