NFC antenna device with adjustable self-resonant frequency, electronic equipment and method

Abstract

The invention provides an NFC antenna device with adjustable self-resonant frequency, electronic equipment and a method. The NFC antenna device comprises a metal wire and a capacitor device, wherein the metal wire is a spiral ring wire or the like, and a base material can be PCB, FPCB or FPC or the like; the capacitor device is connected to both ends of the metal wire for adjusting the self-resonant frequency. Compared with conventional NFC antennas, the NFC antenna device provided by the invention has the advantages of flexible design, and capability of adjusting the self-resonant frequency; a small number of turns, and an increased effective radiation area of the antenna; more uniform radiation magnetic field due to the spiral ring wire; and good compatibility, good practicability and wider application range.

Description

technical field [0001] The present invention relates to an NFC antenna, in particular to an NFC antenna device with an adjustable self-resonant frequency, electronic equipment and a method. Background technique [0002] Undoubtedly, in recent years, the application of NFC near-field communication technology in electronic products has become more and more extensive, and the application of NFC has developed rapidly. [0003] However, with the rapid development of NFC applications, some problems have also emerged, such as insufficient compatibility between NFC products, which is specifically reflected in the large deviation of the self-resonant frequency of the antenna device. Generally, the operating frequency of NFC is around 13.56MHz. If the frequency is too high or too low, the performance of NFC will be affected, for example, the reading distance of reading and writing mode will decrease, the distance of swiping POS machine in card emulation mode will decrease or the sensi...

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Problems solved by technology

[0003] However, with the rapid development of NFC applications, some problems have also emerged, such as insufficient compatibility between NFC products, which is specifically reflected in the large deviation of the self-resonant frequency of the antenna device

Generally, the operating frequency of NFC is around 13.56MHz. If the frequency is too high or too low, the performance of NFC will be affected. For example, the reading distance of reading and writing mode will decrease, the distance of swiping POS machine in card simulation mode will decrease or the sensitivity will become lower.

[0004] Theoretically, the antenna device can adjust the self-resonant frequency by adjusting the number of turns of the wire, but too many turns of the wire will reduce the effective radiation area of ​​the antenna, and the radiation effect is not good; if the number of turns of the wire is too small, the quality factor Q value If the requirements are not met, the performance of NFC will also be affected. In addition, the antenna device space of general electronic products is limited, so it is difficult to adjust the self-resonant frequency by adjusting the number of turns of the wire.

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