The CER0643B from CTS Electronic Components is a Band Pass Filter with Frequency 2.05 to 2.23 GHz, Bandwidth 180 MHz, Insertion Loss Less than 1.7 dB, Rejection 20 to 44 dB, Power 2 to 20 W. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for CER0643B can be seen below.