The QPQ1904 from Qorvo is a Band Pass Filter with Frequency 5490 to 5835 MHz, Bandwidth 160 MHz, Center Frequency 172.5 MHz, Insertion Loss 1.6 to 2 dB, Upper Rejection 30 to 59 dB @ 7200 to 11800 MHz. Tags: Surface Mount, BAW Filter. More details for QPQ1904 can be seen below.