一种近场调制型芯片天线特性的研究

近场直接天线调制（NFDAM）技术是新近出现的一种高安全性宽频带调制技术，它改善了传统调制技术中系统结构复杂、通信的安全性差等特点。应用NFDAM 技术所设计的近场调制型芯片天线能够发射一种与方向相关的信号，所辐射的远场信号由于天线近场电磁边界条件的改变而进行调制，本论文通过在主天线附近放置具有开关的反射器的方式实现改变天线辐射特性，开关的闭合和断开的控制改变反射器的反射特性，从而形成不同组合的天线形式。本文设计完成了一个工作在60GHz 的最简化近场调制型芯片天线，利用CST 电磁仿真软件和MATLAB 软件对天线远场的辐射特性进行了仿真和分析，对近场调制型芯片天线的调制作用及通信的安全性进行了验证。

Research on the Characteristic of the Near-Field Modulation On-Chip Antenna

A new modulation technique named near-field direct antenna modulation is introduced, which simplifies the integrated circuit and improves the communication security. Based on the technology, a near-field modulation on-chip antenna is designed, which can radiate a direction-dependent fashion information. In this technology, the radiated far-field signal is modulated by changes in the antenna near-field electromagnetic (EM) boundary conditions. The design in this paper uses the reflections with switches beside the main antenna to change the antenna characteristic. The state of switch can change the reflection characteristic and then many different antenna patern are archieved. Using CST EM simulation software and MATLAB software to simulate the far-field characteristic of the simplified near-field modulation on-chip antenna operating at 60GHz, it is proved that the near-field modulation on-chip antenna can modulate information and produce a secure communication link.