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Abstract
The propagation characteristics of single and coupled unilateral finlies on arbitrary multilayered, uniaxially anisotropic, dielectric substrates have been obtained. The cutoff frequency has also been evaluated. The solution has been obtained by applying the equivalent transmission-line concept in the spectral domain and by using Galerkins' method. Numerical results for the frequency-dependent propagation constants and characteristic impedances, and for the cutoff frequency are presented. The coupling characteristics of finline directional couplers on anisotropic substrates are also studied and a 3-db coupler is developed for the Ka-band.