The WTRCQV8-3650-3700-20-100-50 from Wainwright Instruments is a Band Stop Filter with Stopband Frequency 3.65 to 3.7 GHz, Bandwidth 20 MHz, Insertion Loss 0.75 dB, Rejection 50 dB, Return Loss 14 dB. Tags: Module with Connectors, Cavity Filter, Notch Filter, Tunable Filter. More details for WTRCQV8-3650-3700-20-100-50 can be seen below.