The 7AH1-12500/T18000 from K&L Microwave is a RF High Pass Filter with Frequency 12.5 to 18 GHz, Insertion Loss 2.5 dB, Rejection 45 dB, VSWR 1.60:1. Tags: Surface Mount, Lumped Component Filter, Chebyshev. More details for 7AH1-12500/T18000 can be seen below.