In this paper, we investigated antenna's miniaturization by adding 4 slits on a square patch antenna. Increase the length of slit leads an obvious decrease of eigenvalue k{sub}0 a, which indicate antenna's miniaturization. Compare to the patch that without any slit, Model I's eigenvalue is reduced 40.7%. and the input impedance can be arranged to have an appropriate value to match the load impedance if we change position of feed point. Further miniaturization is investigated by using a cross-shaped slit instead of slit in Model I. the eigenvalue k{sub}0 a is reduced 48.9(f{sub}0 =2.52[GHz]). Using degeneracy separation method, a circular polarization is achieved.
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