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from Part I - Introduction and Properties of MI
Published online by Cambridge University Press: 04 January 2024
One of the important peculiarities of MI communications is the use of magnetic antennas that can deliver information by using inductive coupling instead of radiation. The magnetic coupling is constrained in the near field, which is more secure since it is not easy to be detected. Moreover, magnetic fields have better penetration efficiency than electric fields. A magnetic antenna is more robust to environment changes than its electric counterpart. In this chapter, we first introduce the fundamentals of antennas to show the difference between magnetic antennas and the widely used electric antennas to gradually narrow our discussion from a big picture. We present the advantages of magnetic antennas and their applicable conditions. Also, we introduce the signal transmission techniques and channel characteristics for the single-input-single-output (SISO) system. Finally, we discuss the multiple-antenna MI system with different antenna placement strategies, which is more reliable and efficient than the SISO system.
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