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Miniaturized inverted-F antennas (IFAs) are proposed for wireless sensor network applications in the 2.45 GHz band. By employing Hilbert geometry, an overall size reduction of 77% was achieved compared to the conventional rectangular patch antenna. The proposed antenna can be easily built in a miniaturized wireless sensor network (WSN). According to the design rules presented in this paper, antennas can be simulated rapidly. An experimental prototype of the miniature antenna was fabricated on a 1.6-mm-thick FR4 substrate. The bandwidth of this antenna less than 10 dB is 220 MHz (2.32-2.54 GHz) and the percentage of the bandwidth is 9.1%. The peak gain is 1.4 dBi. The measurement results indicate that the antenna shows good performance.