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A quasistatic analysis of broadside-coupled microstrip lines using a series form expression of Green's function and the method of moments is described. Characteristic impedances, effective permittivities and ratios between phase velocities for the even and odd modes were obtained for various values of strip widths, W/b, spacings between strips, s/b, and for isotropic and anisotropic substrates.
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D’Assunção et al. (1981) studied this question.
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