The WRCD20-1738-1740-1755-1757-40-2 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 1.74 to 1.755 GHz, Bandwidth 15 MHz, Insertion Loss 2 to 3.5 dB, Rejection 40 dB, VSWR 1.50:1. Tags: Module with Connectors, Cavity Filter. More details for WRCD20-1738-1740-1755-1757-40-2 can be seen below.