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A novel equilateral triangular patch with a rectangular notch etched to one radiating edge on organic magnetic substrate isproposed for dual frequency operation. Both operations of these dual frequencies arise from the perturbation of TM10 and TM11 modeby simply cutting a rectangular notch at the patch bottom. Simulations and experiments have shown the validity of this design. Usingan organic magnetic material as the substrate, the antenna exhibits a broader bandwidth of 5.5% and 4.7% at dual-frequencies 1.56GHz and 2.45 GHz, respectively, as well as a reduced size compared to the dual-frequency patch antennas on non-magnetic material.