In this study, dual-port dual-frequency tuneable MIMO planar inverted-F antenna (PIFA) is presented for mobile handheld device applications. The proposed MIMO antenna consists of two symmetrical PIFAs with the centre-to-centre distance of 43.0 mm (0.1906λ ₀ ). The dual-band tunability is achieved by changing the capacitance (V ¹ and V ² ) of 4.15 pF (0 V)-0.72 pF (15 V). The impedance bandwidth of -6 dB is realised from 0.8 to 0.98 GHz for the lower band and 1.65 to 2.2 GHz for the higher band. The proposed antenna provides the independent frequency tunability without disturbing the frequency bands. It shows the good isolation for both the tuneable bands >20 dB without using any coupling element between the antenna structure. It has a peak realised gain of 3.44 dBi, good efficiency of > 75% and envelope correlation coefficient of 0.007. In addition, the proposed PIFA performance is analysed with total active reflection coefficient, channel capacity, diversity gain, multiplexing efficiency, mean effective gain and specific absorption ratio for the tuneable range of frequencies. The good agreement is obtained between simulation and experimental performances to validate the antenna parameters.

中文翻译：

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适用于移动手持设备中LTE应用的双频可重配置MIMO PIFA

在这项研究中，提出了用于移动手持设备应用的双端口双频可调谐MIMO平面倒F天线（PIFA）。所提出的MIMO天线由与中心距为43.0毫米（0.1906λ两个对称PIFAs的 ₀ ）。通过改变电容（V ¹和V ^2）来实现双频段可调谐性 ）的4.15 pF（0 V）-0.72 pF（15 V）。低频范围从0.8到0.98 GHz，高频范围从1.65到2.2 GHz，实现-6 dB的阻抗带宽。所提出的天线提供了独立的频率可调性，而不会干扰频带。它显示了> 20 dB的两个可调频段都具有良好的隔离度，而天线结构之间没有使用任何耦合元件。它的峰值实现增益为3.44 dBi，效率高达> 75％，包络相关系数为0.007。此外，还针对可调谐频率范围，通过总有源反射系数，信道容量，分集增益，多路复用效率，平均有效增益和特定吸收比对PIFA性能进行了分析。