| 摘要 |
[Purpose] The purpose of this invention is to inexpensively provide a magnetic loop antenna and a magnetic-field communication device using same that allow magnetic-field communication using magnetic-field signals with a desired bandwidth, from narrowband to wideband, at short-to-medium distances, from several centimeters to several kilometers, in an inductive channel consisting of air, a substance in which electromagnetic signals experience comparatively high propagation losses, seawater or fresh water having a salinity of 0-5%, or a combination thereof. [Solution] This magnetic loop antenna and magnetic-field communication device using same use magnetic-field signals that are inductively coupled by varying magnetic fields to implement wideband magnetic-field communication at short-to-medium distances in the abovementioned inductive channel while preventing the magnetic loop antenna from exhibiting severe mismatch loss due to radiation or reradiation of a displacement current. |
