The AT23B-AX102-NM-NF from Aaren Technology Ltd is a Band Stop Filter with Stopband Frequency 2110 to 2170 MHz, Insertion Loss 1 dB, Rejection 25 dBc, Power 3 W, Center Frequency 2140 MHz. Tags: Module with Connectors, Notch Filter. More details for AT23B-AX102-NM-NF can be seen below.