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Geometry of the antenna for the single feed structure: (a) side view, (b) top view of the front side, and (c) top view of the bottom side. The optimized design parameters of the 5 × 5 patch array antenna, which achieved the best broadside gain and a 3-dB gain bandwidth, are A = 1800 μm, H = 40 μm, D = 200 μm, P = 340 μm, WS = 15 μm, WD = 10 μm, and g = 10 μm.
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