The HF0AA1800A7 from KYOCERA AVX is a RF High Pass Filter with Frequency 1.80 to 4.21 GHz, Bandwidth 2410 MHz, Insertion Loss 0.76 to 1.20 dB, Power 2 W, Rejection 30 to 40 dB. Tags: Surface Mount, PCB Mount, Ceramic Filter. More details for HF0AA1800A7 can be seen below.