The RNFL3351K from RF-Lambda is a Band Stop Filter with Stopband Frequency 3.234 to 3.468 GHz, Insertion Loss 2.5 dB, Rejection 50 to 55 dB, Power 50 W, VSWR 1.80:1. Tags: Module with Connectors, Cavity Filter, Notch Filter. More details for RNFL3351K can be seen below.