The 1905BP18A0050 from Johanson Technology is a Band Pass Filter with Frequency 1.88 to 1.93 GHz, Center Frequency 1.9 GHz, Insertion Loss 1.65 dB, Rejection 15 @ 2300 to 6000 MHz to 30 dB @ 5640 to 5790 MHz, Upper Rejection 15 @ 2300 to 6000 MHz to 30 dB @ 5640 to 5790 MHz. Tags: Ceramic, Surface Mount, Ceramic Filter. More details for 1905BP18A0050 can be seen below.