Influence of eccentricity on the frequency limitations of circular-pad via-holes |
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Authors: | Kouzaev GA Deen MJ Nikolova NK Rahal AH |
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Institution: | McMaster Univ., Hamilton, Ont., Canada; |
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Abstract: | We study the influence of the technologically caused eccentricity of a circular-pad via-hole. We derive an eigenvalue equation using a rigorous method based on a linear transformation of the via-hole polar coordinates. The eigenvalue equation is used to compute the modal resonant frequencies and the modal fields of the eccentric via. It is shown that the via-hole misalignment shifts the modal frequencies and influences its frequency band. The proposed model is verified with published experimental data, and is also compared with results generated with the full-wave simulator Agilent Momentum-2002. |
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