In this paper the problem of a rectangular microstrip antenna printed on a uniaxial substrate with a superstrate loaded is treated. The effects of superstrate on the complex resonant frequency of the rectangular microstrip antenna on a uniaxial substrate is studied. Special constitutive relations are used in describing the uniaxial properties of the matrial, such as the dyadic Green's function can be formulated. Electromagnetic fields and boundary conditions in the spectral region were used in finding Green's function. Using Galerkin's method in solving the integral equation, the complex resonant frequency of the antenna is studied with sinusoidal basis functions, which show fast numerical convergence.
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