The HFE-5-6.25 from ESJ Technology is a RF High Pass Filter with Frequency 5 to 6.25 GHz, Insertion Loss 2.5 dB, Rejection 80 dB, Lower Rejection 80 dB@DC to 4.625 GHz, VSWR 1.30:1. Tags: Module with Connectors. More details for HFE-5-6.25 can be seen below.