The BSF-1950MS5 from RF ONE Electronics is a Band Stop Filter with Stopband Frequency 1.92 to 1.98 GHz, Insertion Loss 2 dB, Rejection 40 dB, Power 40 W, Return Loss 10 dB. Tags: Module with Connectors, Cavity Filter, Ceramic Filter, LC Filter. More details for BSF-1950MS5 can be seen below.