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Analysis and measurement of rapidly attenuating fields around magnetic multipoles in low-frequency band

机译：低频频带磁力量围绕磁力量迅速衰减场的分析与测量

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It is known that the attenuation rate of fields around multipoles becomes larger as the order of the multipoles increases. We experimentally confirmed that a magnetic quadru-pole and octapole composed of coil antennas can create low-frequency magnetic fields attenuating at the rate of 80 and 100 dB/decade, respectively. We also obtained approximate equations that represent the fields around the quadrupole and octapole in simple forms. The rapid attenuation of the low-frequency magnetic fields can provide identification areas with well-defined boundaries, which will be needed in order to build reliable radio-frequency identification systems for communication with things and mobile/wearable devices.
机译：众所周知，随着多能量的顺序增加，多主体周围的字段的衰减率变大。我们通过实验证实，由线圈天线组成的磁性Quadru-杆和Octapole分别可以分别以80和100 dB /十年的速度产生衰减的低频磁场。我们还获得了近似方程，其以简单的形式代表四极和OctaPole周围的字段。低频磁场的快速衰减可以提供具有明确定义边界的识别区域，以便建立可靠的无线电频率识别系统，以便与事物和移动/可穿戴设备进行通信。

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