Thanks to the MEMS and SoC technologies, the wireless sensor networks (WSN) enabled inertial sensor node (ISN) can be implemented on a very small printed circuit board (PCB). A miniaturized printed monopole antenna with metallic grid is proposed for the small ISN. The binary particle swarm optimization (PSO) is employed to find the optimized configuration of the metallic grids with the specified bandwidth and antenna efficiency. Comparisons of the simulated optimized antenna and the corresponding fabricated antennas are also studied. The proposed antenna and the design procedure can be applied to most antenna design for small wireless sensors and provides low-cost antenna solution.
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