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首页> 外文期刊>Antennas and Propagation, IEEE Transactions on >Mutual Coupling Reduction of Two PIFAs With a T-Shape Slot Impedance Transformer for MIMO Mobile Terminals
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Mutual Coupling Reduction of Two PIFAs With a T-Shape Slot Impedance Transformer for MIMO Mobile Terminals

机译：用于MIMO移动终端的带有T形槽阻抗变压器的两个PIFA的互耦减少

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摘要

An efficient technique is introduced to reduce mutual coupling between two closely spaced PIFAs for MIMO mobile terminals. The proposed mutual coupling reduction method is based on a T-shape slot impedance transformer and can be applied to both single-band and dual-band PIFAs. For the proposed single-band dual PIFAs, the 10 dB impedance bandwidth covers the 2.4 GHz WLAN band (2.4–2.48 GHz), and within the WLAN band an isolation of over 20 dB is achieved. Moreover, the dual-band version covers both the WLAN band and the WiMAX band of 3.4–3.6 GHz, with isolations of over 19.2 dB and 22.8 dB, respectively. The efficiency, gain and radiation patterns of the two-PIFA prototypes are verified in measurements. Due to very low pattern correlation and very good matching and isolation characteristics, the capacity performances are mainly limited by radiation efficiency. The single-band and dual-band PIFAs are also studied with respect to their locations on the ground plane. An eight-fold increase in the bandwidth of one PIFA is achieved, when the single-band PIFAs are positioned at one corner of the ground plane, with the bandwidth of the other PIFA and the good isolation unchanged.
机译：引入一种有效的技术来减少用于MIMO移动终端的两个紧密间隔的PIFA之间的相互耦合。所提出的互耦减小方法基于T形槽阻抗变压器，并且可以应用于单频带和双频带PIFA。对于建议的单频带双PIFA，10 dB的阻抗带宽覆盖了2.4 GHz WLAN频带（2.4–2.48 GHz），并且在WLAN频带内实现了20 dB以上的隔离度。此外，双频版本涵盖WLAN频段和3.4–3.6 GHz的WiMAX频段，隔离度分别超过19.2 dB和22.8 dB。在测量中验证了两个PIFA原型的效率，增益和辐射方向图。由于非常低的图案相关性以及非常好的匹配和隔离特性，电容性能主要受到辐射效率的限制。还研究了单频段和双频段PIFA的接地平面位置。当单频带PIFA放置在接地平面的一个角上，而另一个PIFA的带宽和良好的隔离度保持不变时，一个PIFA的带宽将增加8倍。

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