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In this letter, we have proposed a novel idea for producing additional modified mode(s) in a metamaterial-loaded rectangular patch antenna. The proposed idea has defined the possible range of variations of the material parameters for different kinds of metamaterials to get additional modified resonant mode(s). Moreover, we have also indicated the appropriate choice of particular metamaterial for different specific purposes like antenna size reduction and other mode modification-related applications. According to our proposed idea, it is possible to get better radiation performance for interface resonance mode by introducing modified TM0δ0 modes ( 0 <; δ <; 1, 1 <; δ <; 2, 2 <; δ <; 3, or 3 <; δ <; 4, etc). Here, we have shown only the dual-band results. Successful design of triple- or tetraband antenna is also possible by using our proposed idea. Using unconventional TM0δ0 mode (0 <; δ <; 1), it has also been shown that miniaturization of a rectangular patch antenna may be only possible with μ -negative (MNG) metamaterial.