The D3I2731Q from DiTom Microwave is an isolator that operates from 27 to 31 GHz. It has an insertion loss of less than 0.6 dB and an isolation of more than 20 dB. The isolator can handle up to 5 W of average power and 30 W of peak power. This isolator is available in a module with 2.4 mm (F) connectors.