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A frequency-dependent basis function applied to microstrip

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3 Author(s)
Hechtman, C. ; Dept. of Electr. Eng., Stevens Inst. of Technol., Hobocken, NJ, USA ; Zmuda, H. ; Gabbay, D.

Spheroidal wave functions (SWF) and the spectral-domain method (SDM) are used to compute the effective dielectric constant for microstrip. The authors explore the ability of the SWF to change shape as a function of a parameter, e.g. frequency, while maintaining orthogonality, completeness, edge condition, and aperture limit. The authors introduce the SDM equations, provide a brief overview of the SWF, and study the effective dielectric constant as a function of frequency for several commonly used basis functions. A single-term expansion for the vector current density provides excellent results over a broad spectrum (1-100 GHz). Numerical results compare favorably with other commonly used techniques

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:39 ,  Issue: 5 )