Performances study of compact printed diversity antenna in the presence of user's body for LTE mobile phone applications

摘要

In this article, three kinds of user effect are considered, namely, “specific anthropomorphicmannequin (SAM) head and personal digital assistants (PDA) hand (talkmode),” “PDA hand (data mode),” and “Dual hands (read mode)” for the performancestudy of the compact LTE MIMO antenna. This is in continuation of the previouslypublished work which has been investigated in the free space. However, thedesigned 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 investigatedby placing the planar monopole antenna (PMA) on the top and the bottom portionof the mobile printed circuit board (PCB). The performances like S-parameters,radiation performances, diversity performances, and channel capacity loss are studiedand optimal location of PMA is assigned either top or bottom portion of mobilephone PCB based on the results obtained from the respective positions. Finally, thespecific absorption rate is estimated and found well below the standard limit of FCCthat is, less than 1.6 W/kg over 1 g tissue and European that is, 2 W/kg over 10 gtissue. In present work, it is observed that top positioned PMA provides optimal performancesin the user proximity over PCB.