Wireless sensor networks (WSNs) are a candidates for data collection in factories. WSNs possess the problem of securing power for each sensor. Cavity resonance-enabled wireless power transfer (CR-WPT) has attracted attention as a solution to the abovementioned problem. This study proposes a design methodology for a miniaturized power-receiving module for the CR-WPT. The optimum matching circuit for the compact power-receiving modules are designed by considering the transmitter, cavity resonator, and receiver as a single system. The power-receiving module for a transmission frequency of 119 MHz is reduced from 280 x 59 x 67 mm3 to 100 x 30 x 30 mm3, which means a 92% reduction in volume. The compact power-receiving module obtains an efficiency similar to that of a previous power-receiving module.
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