volume | PIER Journals

Abstract

In the gyrotron traveling wave amplifier (gyro-TWA), high loss dielectric materials loaded in a cylindrical waveguide are adopted to suppress the unwanted parasitic oscillations. It is of great importance to accurately understand the relative permittivity ε_r and tanδ for studying the microwave and millimeter wave dispersion, and loss properties of a specific mode. The high lossy dielectric loaded circuit of the gyro-TWAs made of the BeO-SiC ceramic with certain relative permittivity and loss tangent are theoretical calculated, simulated and measured. The field distribution, dispersion and loss properties of three different dielectric loaded circular HE^d₁₂, HE^d₂₂ and TE^d₀₂ modes (corresponding to the TE₁₁, TE₂₁ and TE₀₁ modes in the smooth hollow cylindrical waveguide respectively) in different frequency bands are respectively investigated. The theoretical analysis, simulation, and measurement results have a good agreement. This work has clear guiding significance for the stable work of gyro-TWAs.

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Dr. Weijie Wang

Dr. Weijie Wang

Dr. Wei Jiang

Dr. Yelei Yao

Dr. Jianxun Wang

Dr. Yong Luo