The JFCD39K0-LH-WR28 from JQL Electronics is a RF Duplexer with Frequency 38.95 to 40 GHz, Band 1 39.65 to 40 GHz, Band 2 38.95 to 39.3 GHz, Power 3.16 W, Insertion Loss 1.5 to 1.8 dB. Tags: Waveguide. More details for JFCD39K0-LH-WR28 can be seen below.