| Summary: | 碩士 === 景文科技大學 === 電子工程系電腦與通訊碩士班 === 102 === This thesis proposes the use of cross-winding folding loop antenna transformation structure to improve the traditional spiral winding of the NFC tag antenna impedance matching and optimization of the magnetic field strength. This structure is suitable for shape cards and ISO standard cards, through analysis of the coil outline and the coil turns, Regarding the shape cards we gain the study results of 32 percent impedance match improvement, 14 percent reading distance improvement; ISO standard cards we gain the study results of 13.6 percent impedance match improvement, 5.8 percent reading distance improvement. Fixing the NFC operating frequency, the effect of cross-winding folding loop antenna is direct proportional with the number of turns.
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