The 2H8BAG from Renaissance is a drop-in circulator that operates from 6 GHz to 12 GHz. It has an isolation up to 15 dB, an insertion loss up to 0.5 dB and a VSWR under 1.42:1. The isolator can handle up to 1 W CW of power. It measures 0.375 x 0.3 x 0.375 inch.