The HFE-4.5-15 from ESJ Technology is a RF High Pass Filter with Frequency 4.5 to 15 GHz, Insertion Loss 1 dB, Rejection 50 dB, Lower Rejection 50 dB@DC to 3000 MHz, VSWR 2.00:1. Tags: Module with Connectors. More details for HFE-4.5-15 can be seen below.