The SiMF18R75/2R5-6D2 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 17.5 to 20 GHz, Center Frequency 18.75 GHz, Insertion Loss 1.6 dB, Rejection 30 dB @15.6GHz&21.35GHz, 40 dB @15GHz&21.6GHz, 60 dB @DC~13GHz, 38 dB @22~32GHz, Upper Rejection 30 to 40 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF18R75/2R5-6D2 can be seen below.