The D3I2030 from Ditom is a coaxial isolator that operates from 20 to 30 GHz. It has an isolation of over 16 dB with an insertion loss of below 0.7 dB and can handle up to 5 watts of average forward power, 2 watts of reflective power and 30 watts of peak power. The isolator is available in a module with K-type female connectors.
