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A ground radiation antenna with tunable metal loads is proposed to improve the performance of a normal antenna at 900 MHz for Z-wave applications. The proposed design is comprised of a 5 mm × 5 mm ground radiation antenna and inductor-connected metal loads in a 30 × 50 mm ground plane. The metal loads can take the form of rims, a frame, strips, or wires at the ends of the ground plane and are connected...
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