The HF0AA4270A7 from KYOCERA AVX is a RF High Pass Filter with Frequency 4.27 to 8 GHz, Bandwidth 3730 MHz, Insertion Loss 0.77 to 1.20 dB, Power 2 W, Rejection 30 to 40 dB. Tags: Surface Mount, PCB Mount, Ceramic Filter. More details for HF0AA4270A7 can be seen below.