W-band quasi-optical mode converter for gyro-devices

An improved W-band corrugated horn has been designed, manufactured, and experimentally measured for integration into a gyro-device as a quasi-optical launcher. This horn converts a cylindrical TE₁₁ mode into the free space TEM₀₀ mode over the frequency band of 90-100 GHz with a reflection better than -30 dB and a coupling efficiency of ~99.4%.