The WRCD20-1850.4-1852.4-1872.4-1874.4-40 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 1.8524 to 1.8724 GHz, Bandwidth 20 MHz, Insertion Loss 2 to 3.5 dB, Rejection 40 dB, VSWR 1.50:1. Tags: Module with Connectors, Cavity Filter. More details for WRCD20-1850.4-1852.4-1872.4-1874.4-40 can be seen below.