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Abstract
The edge-based finite element method is introduced to analyze the cutoff characteristic of the dominant mode and the field patterns in two types of elliptic-shaped microshield lines. These elliptic-shaped microshield lines include elliptic-shaped microshield line with single signal line and dual signal lines. The cutoff wavelength of the dominant mode can be adjusted by changing the dimensions of metallic signal strips as well as by adjusting their positions. Field patterns of the dominant mode and the first higher-order mode for different dimensions and the dielectric constant of dielectric substrate are illustrated. Numerical results in this article provide an extension to the existing design data of elliptic-shaped microshield line and are considered useful in practical applications.