The JFCD39K0-LL-WR28 from JQL Electronics is a RF Duplexer with Frequency 38.6 to 39.65 GHz, Band 1 39.3 to 39.65 GHz, Band 2 38.6 to 38.95 GHz, Power 3.16 W, Insertion Loss 1.5 to 1.8 dB. Tags: Waveguide. More details for JFCD39K0-LL-WR28 can be seen below.