The KFF6338A from CTS Electronic Components is a Band Pass Filter with Frequency 1.57 to 1.58 GHz, Bandwidth 11 MHz, Insertion Loss Less than 1.5 dB, Rejection 7 to 27 dB, Power 1 to 10 W. Tags: Surface Mount, Ceramic, Ceramic Filter. More details for KFF6338A can be seen below.