| 发明名称 |
Near Field Communication Apparatus |
| 摘要 |
A system for use in a near field communications (NFC) reader, for detecting the presence of an NFC tag, is disclosed. The NFC reader has an antenna tuned to a resonant frequency. The system comprises: a first signal generator for generating a carrier signal whose frequency varies about the resonant frequency; a second signal generator for generating a modulating signal for modulating the carrier signal; a modulator for modulating the carrier signal with the modulating signal; a driver for driving the antenna with the modulated signal; and a detection system for detecting harmonics of the modulating signal in a signal present in the antenna as a result of the modulated signal. The detector is configured to generate an output when a third or higher order harmonic is detected. |
| 申请公布号 |
US2014194055(A1) |
申请公布日期 |
2014.07.10 |
| 申请号 |
US201313734849 |
申请日期 |
2013.01.04 |
| 申请人 |
Jones Steve |
发明人 |
Jones Steve |
| 分类号 |
H04B5/00 |
主分类号 |
H04B5/00 |
| 代理机构 |
|
代理人 |
|
| 主权项 |
1. A system for use in a near field communications (NFC) reader for detecting the presence of an NFC tag, the NFC reader having an antenna tuned to a resonant frequency, the system comprising:
a first signal generator for generating a carrier signal whose frequency varies about the resonant frequency; a second signal generator for generating a modulating signal for modulating the carrier signal; a modulator for modulating the carrier signal with the modulating signal; a driver for driving the antenna with the modulated signal; and a detection system for detecting harmonics of the modulating signal in a signal present in the antenna as a result of the modulated signal; wherein the detection system is configured to generate an output when a third or higher order harmonic is detected. |
| 地址 |
Milton Keynes GB |
