The WRCD20-1764-1765-1770-1771-40 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 1.765 to 1.77 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 WRCD20-1764-1765-1770-1771-40 can be seen below.