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Frequency characteristics and bending test for wireless sensor. (a) Photograph image of bent device with RoC of 7 mm. (b) Picture of operating device in bent state. (c) S11 data of device measured by vector network analyzer (VNA) with cyclic bending stress. (d) Variation in Q-factor and resonance frequency of device in cyclic bending stress. (e) Peeling of test for evaluation device adhesion with skin.
