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Variation of lower resonance frequency with center strip length is shown in Figure 7(b). It is found that resonance frequency decreases with increasing width of notch (i.e. center strip length). Results of proposed method are similar to that of FDTD method. Little variation in the two results is due to approximation involved in the cavity theory that is used for equivalent circuit model. The variation of lower resonance frequency as a function of side strip length is shown in Figure 7(c) along with the reported results. It is observed that the resonance frequency decreases with side strip length and the results from proposed method are in good agreement with the FDTD method. It may be mentioned that all the data obtained from proposed method are almost in good agreement with reported results. This validates the veracity of proposed method of analysis. 5. CONCLUSION It may therefore be inferred from this analysis that H-shaped patch exhibits dual resonance behavior and the resonance frequency are very sensitive to the dimensions of the notch. Such antenna can be successfully used at two different frequencies as per requirement

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