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Journal of Antennas 2022
一种提高移动终端天线隔离度的方法
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Abstract:
本文研究移动终端天线的隔离度提高方法。首先通过理论的推导得出了对称设计的天线当共模(CM)与差模(DM)阻抗相等的时候隔离度最优的结论。基于此分析思路提出并设计了紧耦合情况下通过在两个相邻的倒F天线地脚之间同时串联电感和电容来提升隔离度的方法。首先，通过xfdtd仿真软件对比了串联电感和电容前后天线间隔离度的变化。其次，制作了实验治具并对隔离度和回损进行了测试。实验结果表明，此方法在设计频段内隔离度提升约4.5~8.5 dB，仿真和实验结果均表明该方法有效。
In this paper, the isolation improvement method of mobile terminal antenna is studied. For the symmetrically designed antennas, the isolation is optimal when the impedances of the common mode (CM) and the differential mode (DM) are equal. Based on this analysis method, a method is proposed to improve the isolation by connecting simultaneously inductance and capacitance in series between two adjacent inverted-F antenna ground points in the case of tight coupling. First, the isolation without and with series inductance and capacitance is compared by the xfdtd simulation software. Secondly, the proposed antenna was manufactured then the isolation and return loss were measured. The experimental results show that this method could improve the isolation by about 4.5~8.5 db in the operational frequency band, and both the simulated and measured results show that the method is effective.
| [1] | Chae, S.H., Oh, S.-K. and Park, S.-O. (2007) Analysis of Mutual Coupling, Correlations, and TARC in WiBro MIMO Array Antenna. IEEE Antennas and Wireless Propagation Letter, 6, 122-125.
https://doi.org/10.1109/LAWP.2007.893109 |
| [2] | Sun, L.B., Feng, H.G., Li, Y. and Zhang, Z.J. (2018) Compact 5G MIMO Mobile Phone Antennas with Tightly Arranged Orthogonal-Mode Pairs. IEEE Transactions on Antennas and Propagation, 66, 6364-6369.
https://doi.org/10.1109/TAP.2018.2864674 |
| [3] | Hsu, C.-C., Lin, K.-H. and Su, H.-L. (2011) Implementation of Broadband Isolator Using Metamaterial-Inspired Resonators and a T-Shaped Branch for MIMO Antennas. IEEE Trans-actions on Antennas and Propagation, 59, 3936-3939.
https://doi.org/10.1109/TAP.2011.2163741 |
| [4] | Zhang, S., Lau, B.K., Tan, Y., Ying, Z.N. and He, S.L. (2012) Mutual Coupling Reduction of Two PIFAs with a T-Shape Slot Impedance Transformer for MIMO Mobile Terminals. IEEE Transactions on Antennas and Propagation, 60, 1521-1531. https://doi.org/10.1109/TAP.2011.2180329 |
| [5] | Diallo, A., Luxey, C., Thuc, P.L., Staraj, R. and Kossiavas, G. (2006) Study and Reduction of the Mutual Coupling between Two Mobile Phone PIFAs Operating in the DCS1800 and UMTS Bands. IEEE Transactions on Antennas and Propagation, 54, 3063-3074. https://doi.org/10.1109/TAP.2006.883981 |
| [6] | Deng, J.Y., Li, J.Y., Zhao, L.Y. and Guo, L.X. (2017) A Du-al-Band Inverted-F MIMO Antenna with Enhanced Isolation for WLAN Applications. IEEE Antennas and Wireless Propagation Letters, 16, 2270-2273.
https://doi.org/10.1109/LAWP.2017.2713986 |
| [7] | Sui, J.W. and Wu, K.L. (2017) Self-Curing Decoupling Tech-nique for Two Inverted-F Antennas with Capacitive Loads. IEEE Transactions on Antennas and Propagation, 66, 1093-1101. https://doi.org/10.1109/TAP.2018.2790041 |
| [8] | Sun, L.B., Li, Y. and Zhang, Z.J. (2021) Decoupling between Extremely Closely Spaced Patch Antennas by Mode Cancellation Method. IEEE Transactions on Antennas and Propagation, 69, 3074-3083.
https://doi.org/10.1109/TAP.2020.3030922 |
| [9] | Sun, L.B., Li, Y., Zhang, Z.J. and Wang, H.Y. (2020) Self-Decoupled MIMO Antenna Pair with Shared Radiator for 5G Smartphones. IEEE Transactions on Antennas and Propagation, 68, 3423-3432.
https://doi.org/10.1109/TAP.2019.2963664 |
| [10] | Sun, L.B., Li, Y. and Zhang, Z.J. (2021) Wideband Integrated Quad-Element MIMO Antennas Based on Complementary Antenna Pairs for 5G Smartphones. IEEE Transactions on Antennas and Propagation, 69, 4466-4474.
https://doi.org/10.1109/TAP.2021.3060020 |
| [11] | Sun, L.B., Li, Y. and Zhang, Z.J. (2021) Wideband Decoupling of Integrated Slot Antenna Pairs for 5G Smartphones. IEEE Transactions on Antennas and Propagation, 69, 2386-2391. https://doi.org/10.1109/TAP.2020.3021785 |
