Cashless payment has played an important role in everyday life such as using smartphone for purchase but not much fluidly, because smartphones cannot instantaneously pay and not enough portability. So, we have designed a ring antenna to attach to our accessories which make purchased more fluidly and always with us by following ISO 14443 type A standard for NFC cashless payment operated at 13.56 MHz frequency. We have tested by winding of small copper coils for impedance matching in NFC chip tag at 13.56 MHz frequency then applied to NFC reader.
（英）
Cashless payment has played an important role in everyday life such as using smartphone for purchase but not much fluidly, because smartphones cannot instantaneously pay and not enough portability. So, we have designed a ring antenna to attach to our accessories which make purchased more fluidly and always with us by following ISO 14443 type A standard for NFC cashless payment operated at 13.56 MHz frequency. We have tested by winding of small copper coils for impedance matching in NFC chip tag at 13.56 MHz frequency then applied to NFC reader.