The ELELA450F50AQ from ECHO Microwave is a Low Pass RF Filter with Frequency 0 to 450 MHz, Bandwidth 450 MHz, Insertion Loss 3 dB, Rejection 50 min. @ 500~1000MHz, 55 min. @ 1500~2000MHz, Return Loss 14 dB. Tags: Module with Connector, Lumped Component Filter. More details for ELELA450F50AQ can be seen below.