The HPF-4G18G-CD-SFF from Quantic PMI (Planar Monolithics) is a RF High Pass Filter with Frequency 5500 to 18000 MHz, Insertion Loss 0.75 dB, Rejection -55dBc @ 0.050 to 4.9GHz, VSWR 1.8:1. Tags: Module with Connectors. More details for HPF-4G18G-CD-SFF can be seen below.