The WRCD20-1868-1870-1890-1892-40-4 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 1.87 to 1.89 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 WRCD20-1868-1870-1890-1892-40-4 can be seen below.