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The letter describes how one can obtain the equal effective dielectric constants of even and odd modes on the parallel-coupled microstrip at a frequency by using an anisotropic dielectric substrate with isotropic overlay. The frequency can be varied by using overlays of various thicknesses. The results suggest the possibility of realising a high-directivity coupler in the high-frequency microwave range.
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Shibata et al. (1984) studied this question.
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