The SiMF11/2R4-8D2 from Sainty-Tech Communications Limited is a Band Pass Filter with Frequency 9.8 to 12.2 GHz, Center Frequency 11 GHz, Insertion Loss 2.2 dB, Rejection 30 dB @9.09GHz&13.03GHz, 40 dB @8.7GHz&13.5GHz, 60 dB @DC~8.27GHz, 50 dB @13.57~20GHz, Upper Rejection 30 to 50 dB. Tags: Surface Mount, Cavity Filter. More details for SiMF11/2R4-8D2 can be seen below.