The WRCD20-1858.9-1859.9-1864.9-1865.9-40 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 1.8599 to 1.8649 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 WRCD20-1858.9-1859.9-1864.9-1865.9-40 can be seen below.