Dual Antenna Coupling Manipulation for Low SAR Smartphone Terminals in Talk Position
Dual Antenna Coupling Manipulation for Low SAR Smartphone Terminals in Talk Position
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DOI：
10.1109/tap.2022.3141218
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发表时间：
2022-06
影响因子：
5.7
通讯作者：
M. Jamshed;T. Brown;F. Héliot
中科院分区：
文献类型：
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作者：
M. Jamshed;T. Brown;F. Héliot
提出了利用两个天线的耦合操纵的概念的严格分析，所述两个天线适合于处于语音呼叫的通话位置的现代智能手机设备。通过使用元件之间的最佳相对相位，它们可以显著降低比吸收率（SAR），但由于它们之间的功率分离并且通过利用适当水平的元件间耦合，仍然保持效率。当不在通话位置时，相同的天线元件仍然可以用于多输入多输出（MIMO），而不会严重降低其基本容量限制，但这是次要的。该概念可以应用于从1.8到6 GHz的移动的通信中使用的频率范围，其中接地平面具有足够的形状因子。使用两个平面倒F天线（PIFA）在2.4 GHz的工作进行了广泛的模拟，概念上演示了如何两个天线可以优化，以减少SAR超过50%相比，一个单一的天线元件。无论用户的头部组成以及他们如何在通话位置处理设备，SAR降低都得到保持。天线原型进行测量和比较，以验证当手机远离身体使用两个MIMO终端天线时的容量。
A rigorous analysis of the concept of coupling manipulation utilizing two antennas suited to modern smartphone devices in talk position for voice calls is presented. By using the optimum relative phase between the elements, they can substantially reduce the specific absorption rate (SAR) but still maintain efficiency due to the splitting of power between them and by exploiting a suitable level of interelement coupling. The same antenna elements can still be used for multiple-input–multiple-output (MIMO) when not in talk position without heavily degrading their fundamental capacity limit, but this is of secondary importance. The concept could be applied to frequency ranges used in mobile communications from 1.8 to 6 GHz where the ground plane has sufficient form factor. Extensive simulations using two planar inverted-F antennas (PIFAs) operating at 2.4 GHz are carried out to demonstrate conceptually how two antennas can be optimized to reduce SAR by over 50% compared to a single antenna element. SAR reduction is maintained regardless of the user’s head composition and how they are handling the device in a talk position. Antenna prototypes are measured and compared to verify the capacity when the handset is used away from the body with two MIMO terminal antennas.