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Abstract
The transmission characteristics in antipodal finline are analyzed by edge-based finite element method. The cutoff wavelength of the dominant mode and single-mode bandwidth can be changed by adjusting the thickness of metallic fins and dielectric constant of dielectric substrate. Field patterns of the dominant mode and the first higher-order mode for different dimensions and the dielectric constant of dielectric substrate are also illustrated. Numerical results in this paper are considered useful in practical applications.