The WMPD02-2-18-S from Werbel Microwave is a 2-way stripline power splitter/combiner that operates from 2 to 18 GHz. The divider has an insertion loss of less than 0.9 dB and an isolation of over 16 dB. It can handle up to 10 watts of power as splitter and has a good VSWR. The WMPD03-2-18-S is available in a module that measures 2.25 x 1 x 0.38 inches with SMA female connectors.