The WRCT40-1811.6-1812.4-1817.4-1818.2-50 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 1.8124 to 1.8174 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 WRCT40-1811.6-1812.4-1817.4-1818.2-50 can be seen below.