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Omnidirectional Wireless Power Charging System for Capsule Endoscopy

In this paper, we propose an omnidirectional wireless power charging system for capsule endoscopy. The transmitting coil consists of three segments where the arrangement can provide a more homogeneous magnetic field. Working at around 100kHz, the receiving coil is winded in three directions in order to realize the omnidirectional receiving regardless of the alignment between the transmitting coil and the receiving coil. The experiment illustrates that the system is capable of providing an output power of 20dBm with efficiency of 1%.