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Broadband microwave windows for applications in both millimeter wave and terahertz wave vacuum electron devices were designed, simulated and a W-band multilayer window constructed and measured. These windows are based on the multilayer configuration and offer broadband transmission with a very low reflection. Operating over a wide frequency bandwidth of 10% and 5% in their respective frequency bands...
This paper presents the design, simulation and measurement of two mode converting corrugated horns for application as the output launcher for a gyro-amplifier. Operating over the 90 to 100 GHz frequency range the horns act to convert the TE11 mode to the Gaussian-like HE11 mode. The difference in the horns is one was made initially to meet a more moderate Gaussian content specification while the other...
A W-band quasi-optical horn with smoothly profiled circular inner surface was optimized and measured for a gyrotron traveling wave amplifier. It was designed to achieve low reflection, high fundamental Gaussian mode content and high directivity in the desired frequency range of 90 to 100 GHz. In the measurement, the reflection of the TE11 mode was lower than −37 dB and the directivity was ∼27 dB with...
This paper presents the design and measurement of a HE11 mode multilayer window that is designed for a millimeter wave broadband gyro-amplifier. The window acts to seal the vacuum inside the amplifier whilst coupling out microwave power with minimal reflection and absorption. Operating over 90–100 GHz the simulated reflection of this window is better than −30 dB while the measured reflection shows...
A corrugated horn was design to achieve high Gaussian content horn and low reflection over an operating frequency range of 90–100 GHz was designed and verified by measurement with a vector network analyzer (VNA). The corrugated horn will be used in a W-band gyro-TWA experiment to convert TE11 mode in circular waveguide into a Gaussian-like HE11 mode. The measurement shows a lower than −30 dB reflection...
This paper presents the design of a Brewster window for a W-band gyrotron travelling wave amplifier (gyro-TWA). To maintain the Gaussian-like HE11 mode from the corrugated horn, a corrugated waveguide was optimized to host the Brewster window. The Brewster window was simulated and measured to have a lower than −20 dB reflection over the frequency band 85–101 GHz.
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