The HRMA-CF- 4-4.5 from HRmicrowave is a Band Pass Filter with Frequency 4 to 4.5 GHz, Insertion Loss 3 dB, Upper Rejection 60 dB, Lower Rejection 70 dB, Return Loss 20 dB. Tags: Module with Connectors, Combline Filter. More details for HRMA-CF- 4-4.5 can be seen below.