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Resonant frequency of an inhomogeneous Rectangular Microstrip Antenna

A theoretical investigation is presented for inhomogeneous Rectangular Microstrip Antenna (RMA). The inhomogenity is introduced by adding two different substrate materials side by side. Transcendental equation is given here to predict the resonant frequency for different modes. Fundamental mode only is investigated here. Theoretical results on resonant frequency are compared with data obtained using 3D numerical EM simulator to show the accuracy of our theory.