超材料增强型Magnetic Induction通信的实用设计与实现
Practical Design and Implementation of Metamaterial-Enhanced Magnetic Induction Communication
摘要：
虽然在地下、水下和室内等复杂环境中的无线通信可以实现大量新颖的应用，但是它们的性能受到有损介质和复杂结构的限制。磁感应（MI）已被证明是一种有效的解决方案，以实现在这种环境中的可靠通信。然而，由于小线圈天线的物理限制，如果要求设备是便携式的，MI的通信范围仍然非常有限。为此，超材料增强磁感应（M $^2$ I）通信已被提出，理论结果预测，它可以显着提高通信性能，即，数据速率和通信范围。然而，目前，M $^2$ I的真正实现仍然是一个挑战，并且没有关于球形超材料的设计和制备的指导方针。本文提出了一种利用球形线圈阵列实现M $^2$ I的实用设计方案。我们证明了有效的负磁导率可以实现，并存在一个谐振条件，辐射磁场可以显着放大。对天线的辐射和通信性能进行了评估，并进行了全波仿真，验证了设计目标的正确性。通过使用基于球形线圈阵列的M $^2$ I，通信范围可以显著扩展，正如我们在理想M $^2$ I模型中所预测的那样。最后，建议的M $^2$ I天线的实现和测试在各种环境中。
英文摘要：
Although wireless communications in complex environments, such as underground, underwater, and indoor, can enable a large number of novel applications, their performances are constrained by lossy media and complicated structures. Magnetic Induction (MI) has been proved to be an efficient solution to achieve reliable communication in such environments. However, due to the small coil antenna's physical limitation, MI's communication range is still very limited if devices are required to be portable. To this end, Metamaterial-enhanced Magnetic Induction (M$^2$I) communication has been proposed and the theoretical results predict that it can significantly increase the communication performance, namely, data rate and communication range. Nevertheless, currently, the real implementation of M$^2$I is still a challenge and there is no guideline on design and fabrication of spherical metamaterials. In this paper, a practical design is proposed by leveraging a spherical coil array to realize M$^2$I. We prove that the effectively negative permeability can be achieved and there exists a resonance condition where the radiated magnetic field can be significantly amplified. The radiation and communication performances are evaluated and full-wave simulation is conducted to validate the design objectives. By using the spherical coil array-based M$^2$I, the communication range can be significantly extended, exactly as we predicted in the ideal M$^2$I model. Finally, the proposed M$^2$I antenna is implemented and tested in various environments.
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