The HFE-1.6-6 from ESJ Technology is a RF High Pass Filter with Frequency 1.6 to 6 GHz, Insertion Loss 1 dB, Rejection 50 dB, Lower Rejection 50 dB@DC to 1100 MHz, VSWR 2.00:1. Tags: Module with Connectors. More details for HFE-1.6-6 can be seen below.