The ADRF-4WS-20W-4310 from Advanced RF Technologies is a 4-way Power Divider that operates from 578 to 2700 MHz. The power divider can handle an input power of up to 20 Watts of CW power and has an insertion loss of less than 7 dB, isolation of more than 20 dB. It is available in a module that measures 5.8 x 4.3 x 1.25 inches with 4.3-10 female connectors.
