Renaissance offer a X-band Iso-Adapter that is designed for High Rel applications requiring waveguide to coaxial transition. Operating between 8.2 to 12.4 GHz, the iso-adapter provides 0.5 dB of loss and 18 dB of reverse isolation. The output is WR90 for the
waveguide interface with UG135/U flange. Input is a type N-Female connector.

2A8BAW Datasheet