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A single-fed miniaturized hybrid patch/slot implantable antenna is designed and experimentally demonstrated for medical communications service (MICS) (402-405 MHz). By embedding the meander slot and six open slots in the ground, the proposed antenna can obtain effective size reduction at a fixed frequency operation. Compared to traditional planar inverted-F antennas (PIFAs), the proposed method has advantages of good size reduction and also being easy to be optimized to the necessary resonance frequency. The proposed antenna has dimensions of 10×16×1.27 mm3. The simulated and measured bandwidths are 23.9% and 22.8%, respectively.