Further investigation of a dual-element diversity PIFA for MIMO applications at 2.5 GHz band

Yue Gao, Xiao-dong Chen, Z. Ying, C. Parini
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引用次数: 4

Abstract

Multiple input multiple output (MIMO) technology has been regarded as a practical approach to achieve significant increases of wireless channel capacity or reliability. Recently, the antenna's effect on MIMO system has been investigated intensively, in order to predict the true spectral efficiencies of MIMO systems in a real environment whereby realistic mobile terminals are used. Separation between multiple antenna elements is the most critical parameter affecting mutual coupling. Analytical studies have shown that for minimal or no mutual coupling, the distance between typical antenna elements needs to be at least half wavelength. However, the large separation between antenna elements is not attainable on a mobile terminal. There are a number of suggestions on how to build diversity antennas on a mobile terminal with low mutual coupling. In this context, we have developed a modified planar invert-F antenna (PIFA) and built a dual element array operating in 5.2GHz band with a separation of less than half wavelength (0.35 wavelength) and an isolation better than 28dB, as presented in our previous studies. It is noticed that mutual coupling depends on the frequency of received/transmitted signals since the distance is expressed in terms of the wavelength. Therefore, a dual-element diversity PIFA operating at the lower frequency (2.5GHz band) with an even closer separation (0.17 wavelength) has been studied in this paper.
2.5 GHz频段MIMO应用双元分集PIFA的进一步研究
多输入多输出(MIMO)技术被认为是实现无线信道容量或可靠性显著提高的一种实用方法。近年来,为了预测MIMO系统在实际移动终端环境下的频谱效率,对天线对MIMO系统的影响进行了深入的研究。多天线单元之间的间隔是影响互耦的最关键参数。分析研究表明,在最小互耦或无互耦的情况下,典型天线单元之间的距离至少需要达到半个波长。然而,天线单元之间的大间距在移动终端上是无法实现的。对于如何在低互耦的移动终端上构建分集天线,有很多建议。在此背景下,我们开发了一种改进的平面反f天线(PIFA),并构建了一个工作在5.2GHz频段的双元阵列,其间隔小于半波长(0.35波长),隔离度优于28dB,这与我们之前的研究结果一致。值得注意的是,相互耦合取决于接收/发射信号的频率,因为距离是用波长表示的。因此,本文研究了一种工作在更低频率(2.5GHz频段)、更近距离(0.17波长)的双元分集PIFA。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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