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Different radiation formulas are compared for the case of a rectangular microstrip patch antenna, either on an infinite substrate (Fig. la) or on an infinite ground plane with the substrate truncated at the boundary of the patch (Fig. lb). For both the infinite and truncated substrate cases the electric current model is compared with the magnetic current model using the dominant-mode assumption. A...
Surface-wave excitation from microstrip antennas is of major concern in many practical antenna applications. In this paper, the challenge of reducing the surface-wave excitation from microstrip antennas in a general way is addressed. The proposed approach is based on a theorem called the reduced surface wave (RSW) theorem. The RSW theorem suggests that by properly selecting the permittivity of the...
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