The HPF-3500-18000-P9 from COTS RF is a RF High Pass Filter with Frequency 3500 to 18000 MHz, Insertion Loss 1.5 dB, Rejection 30dB @ 2800 MHz, Lower Rejection 30 dB, VSWR 2.00:1. Tags: Module with Connectors. More details for HPF-3500-18000-P9 can be seen below.