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Although microsensors nowadays can save money, energy, and lives, highly functional devices can exhaust a tiny battery very quickly. Harvesting ambient energy can help replenish the battery, but only when an ambient source is available. Unfortunately, many embedded microsensors are small, stationary, and enclosed, so thermal gradients, motion, and light are absent. Wireless power in these cases is...
Although microsystems today require less power than ever before, they still cannot fit large enough batteries to sustain them for months or years at a time. Ambient energy is appealing, but only when available, which is often not the case for embedded sensors. Transmitting power wirelessly is more practical in these applications. Tiny receivers, however, capture a small fraction of the power that...
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