The HP1822 from Cirocomm Technology Corp is a RF High Pass Filter with Frequency 1494 to 1504 MHz, Insertion Loss 0.8 to 2 dB, Rejection 18 to 20 dB, Lower Rejection 18 to 20 dB @ DC to 1434 MHz, Return Loss 9.5 to 12 dB. Tags: Surface Mount, Ceramic Filter. More details for HP1822 can be seen below.