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An implantable zeroth-order resonance (ZOR) antenna is proposed. By using chip inductors, an epsilon negative ZOR was generated, while achieving an extremely compact antenna size. The antenna has the overall dimensions of 0.021λ0×0.017×0×0.002×0 at the Medical Implantable Communication Service (MICS) band (402-405 MHz) and the 10-dB return loss bandwidth is 2.2- ranging from 400 to 409 MHz. Furthermore, the performance of the proposed antenna is insensitive to the electrical properties of the human body by virtue of the ZOR phenomenon.