Three-dimensional analysis of a through hole with radiation characteristics by the spatial network method

Through holes generate complicated distributions of electromagnetic fields owing to their three-dimensional structures. Rigorous vectorial analyses must be performed for three-dimensional fields by using all field components, boundary conditions, and properties of the medium. The spatial network method, which has many features for analysis of three-dimensional electromagnetic fields in the time domain, was applied to this analysis. The variation of Poynting vector distributions near the through hole is simulated in the time domain. From the distribution of the electric field on the top plane of the through hole containing the connected stripline and the land, the far-field patterns are computed by the Fourier transform. Fundamental characteristics of the radiation from the through hole are thereby obtained