The FH1800-4000KF from Corech Microwave is a RF High Pass Filter with Frequency 18 to 40 GHz, Bandwidth 22000 MHz, Insertion Loss 3.0 dB, Power 5 W, Rejection 25 dB @DC-17 GHz. Tags: Module with Connectors, Suspended Substrate Filter, Stripline. More details for FH1800-4000KF can be seen below.