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Two-Element PIFA Array Structure for Polarization Diversity in UMTS Mobile Phones

机译:UMTS手机中用于极化分集的两元素PIFA阵列结构

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摘要

In this paper, we demonstrate the possibility to strongly modify the radiated fields of a UMTS handset by using a phased two-element PIFA array. The structure is composed of a 100x40 mm2 metallic ground plane acting as the Printed Circuit Board (PCB) of the mobile phone. Two UMTS PIFAs are located at the top edge of this PCB. They are fed by a double Quasi-Lumped Coupler able to provide a 360° phase difference between its two outputs. By properly choosing the DC bias of the double QuasiLumped Coupler, we can set a specific phase difference between the two PIFAs. In this way the two-element array is able to radiate different electromagnetic fields. Simulated and measured radiation patterns in the two main planes of the chassis are presented for different phase differences. It is especially revealed that the novel twoantenna structure is able to radiate vertically-polarized electric fields in the azimuthal plane of the phone and horizontally-polarized electric fields in the same plane when changing the phase shift between the antennas from 0° to 180°. Potential applications are polarization-diversity techniques and Specific Absorption Rate reduction for handsets.
机译:在本文中,我们演示了通过使用相控的两元素PIFA阵列来强烈修改UMTS手机辐射场的可能性。该结构由一个100x40 mm2的金属接地平面组成,用作手机的印刷电路板(PCB)。两个UMTS PIFA位于此PCB的顶部边缘。它们由双准集总耦合器供电,能够在其两个输出之间提供360°的相位差。通过适当选择双准集总耦合器的直流偏置,我们可以在两个PIFA之间设置特定的相位差。这样,两元件阵列能够辐射不同的电磁场。针对不同的相位差,介绍了机箱两个主平面中的仿真辐射图和测量辐射图。特别揭示出,当将天线之间的相移从0°改变为180°时,新颖的双天线结构能够在电话的方位角平面中辐射垂直极化的电场,并在同一平面中辐射水平极化的电场。潜在的应用是极化分集技术和降低手机的特定吸收率。

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