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A design concept of integrating the loop antenna into the front metal frame of a smartwatch Bluetooth device is introduced. The antenna was constructed from a 0.3-mm-thick, rectangular metal frame with a dimension of $5\;{\text{mm}} \times 40\;{\text{mm}} \times 50\;{\text{mm}}$, which encircled the system circuit board of the watch. A separation distance of 2 mm between the loop and the system ground...
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