The QBF-1518-1553-40 from Qualwave is a Band Pass Filter with Frequency 1.518 to 1.553 GHz, Bandwidth 35 MHz, Center Frequency 1535.5 MHz, Insertion Loss 3 dB, Upper Rejection 40 [email protected] MHz. Tags: Surface Mount. More details for QBF-1518-1553-40 can be seen below.