The CER0405B from CTS Electronic Components is a Band Pass Filter with Frequency 3.4 to 3.45 GHz, Bandwidth 50 MHz, Insertion Loss Less than 2.2 dB, Rejection 10 to 20 dB, Power 2 to 20 W. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for CER0405B can be seen below.