The WRCD20-1728-1730-1750-1752-40-1 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 1.73 to 1.75 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 WRCD20-1728-1730-1750-1752-40-1 can be seen below.