RegisterModal analysis of patch antennasFor modal analysis the planar antenna is modeled as a resonant cavity with perfect electric walls at the top and bottom. The main restriction is that the thickness of the dielectric substrate must be much smaller than the wavelength. Then the variance of the electric field in the plane perpendicular to the patch (axis z) is negligible. Because of the applied boundary conditions the electric field is non-zero only along the axis z, whereas the magnetic field has non-zero components only in the x-y plane. Along the boundaries of the metallic patch the Neumann condition for electric field is valid. It expresses the fact that the derivative of the electric field intensity vector normal to the perfect magnetic conductor has to be zero (∂E/∂n = 0). It implies the boundaries of the patch can be considered as perfect magnetic conductor. Back
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