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Miniaturization of antennas using novel magneto-dielectric substrates having permeability and permittivity values greater than one is proposed. The limitations of magneto-dielectric substrates at higher GHz frequencies and their suitable alternatives are discussed. The use of such substrates for the development of miniaturized antennas is validated by synthesis of a nickel cobalt zinc ferrite substrate with permittivity of 10.3 and permeability of 2.3 and loading it in an aperture coupled patch antenna. The loaded substrate shifts the resonance frequency of the base patch antenna to lower frequencies with improvement in return loss thus demonstrating the capability for miniaturization.