The PDC-42181940-21 from Ducommun is a Waveguide Diplexer with Bandwidth 600 MHz, Center Frequency 18.5 GHz / 19.5 GHz, Frequency 18.2 to 18.8 GHz / 19.2 to 19.8 GHz, Frequency Band1 18.2 to 18.8 GHz, Frequency Band2 19.2 to 19.8 GHz. More details for PDC-42181940-21 can be seen below.