The WRCD20-1811.5-1812.5-1817.5-1818.5-40 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 1.8125 to 1.8175 GHz, Bandwidth 5 MHz, Insertion Loss 2 to 4 dB, Rejection 40 dB, VSWR 1.50:1. Tags: Module with Connectors, Cavity Filter. More details for WRCD20-1811.5-1812.5-1817.5-1818.5-40 can be seen below.