The AE1200LL9309-A from Anatech Electronics is a Low Pass RF Filter with Frequency 1 to 1.2 GHz, Stopband Frequency 2 to 3.6 GHz, Insertion Loss 1.0 dB, Rejection 100 dB, Upper Rejection 100 dB@2000 to 3600 MHz. Tags: Module with Connector, Lumped Component Filter, Reflectionless Filter. More details for AE1200LL9309-A can be seen below.