The AM290-300CIR129 circulator has isolation of at least 20 dB, insertion loss of less than 0.4 dB, and VSWR of 1.25:1 or less. Its operating temperature range is 0 to +60 deg. C and handles 100 W average and 500 W peak power. The unit measures 1.9 x 2 x 1 in.