A novel multi-frequency energy harvester has been designed and fabricated, in which it consists of three permanent magnets, three sets of two-layer copper coil and a supported beam of acrylic, while these coils are made of the thin Fire Resistant 4 (FR4) substrates using standard printed circuit board. The energy under the first, second and third resonant modes can be harvested, corresponding to the resonant frequencies of 369 Hz, 938 Hz and 1184Hz, respectively. The maximum output voltage and

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... ower of the first and second vibration mode are 1.38mV, 0.6μW, and 3.2mV, 3.2μW under the case of 14μm exciting vibration amplitude and 0.4mm gap between the magnet and coils, respectively. The feasibility study results are in good agreement with the theoretical calculations and show the promising application potentials.