In this article, three kinds of user effect are considered, namely, “specific anthropomorphic mannequin (SAM) head and personal digital assistants (PDA) hand (talk mode),” “PDA hand (data mode),” and “Dual hands (read mode)” for the performance study of the compact LTE MIMO antenna. This is in continuation of the previously published work which has been investigated in the free space. However, the designed antenna covers LTE700 (0.747‐0.787 GHz) and WWAN (1.7‐3.04 GHz) based on −6 dB reflection coefficient. Further, the effect of users' body is investigated by placing the planar monopole antenna (PMA) on the top and the bottom portion of the mobile printed circuit board (PCB). The performances like S‐parameters, radiation performances, diversity performances, and channel capacity loss are studied and optimal location of PMA is assigned either top or bottom portion of mobile phone PCB based on the results obtained from the respective positions. Finally, the specific absorption rate is estimated and found well below the standard limit of FCC that is, less than 1.6 W/kg over 1 g tissue and European that is, 2 W/kg over 10 g tissue. In present work, it is observed that top positioned PMA provides optimal performances in the user proximity over PCB.

中文翻译：

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在用户身体存在的情况下紧凑型印刷分集天线在LTE手机应用中的性能研究

本文考虑了三种用户效果，即“特定的拟人化人体模型（SAM）头和个人数字助理（PDA）手（通话模式）”，“ PDA手（数据模式）”和“双手（读取模式”），用于紧凑型LTE MIMO天线的性能研究。这是先前在自由空间中进行研究的先前工作的延续。但是，基于-6 dB的反射系数，设计的天线覆盖LTE700（0.747-0.787 GHz）和WWAN（1.7-3.04 GHz）。此外，通过将平面单极天线（PMA）放在移动印刷电路板（PCB）的顶部和底部，可以研究用户的身体影响。像S的表演对参数，辐射性能，分集性能和信道容量损耗进行了研究，并根据从各个位置获得的结果将PMA的最佳位置分配给了手机PCB的顶部或底部。最后，估计比吸收率，发现其远低于FCC的标准极限，即1 g组织中的1.6 W / kg以下，而欧洲10 g组织中的2 W / kg以下。在目前的工作中，可以观察到位于顶部的PMA在PCB上的用户接近度方面提供了最佳性能。