为了提高天线的容量和发射接收速率,LTE通信系统使用了MIMO天线.由于移动终端上空间有限,多个天线间存在较大耦合,天线的辐射效率和通信容量会降低.为了解决这一问题,从S参数的角度推导出了天线的正交辐射模式,提出了通过加入180°耦合器来降低多个天线间耦合的方法.使用HFSS和ADS对设计好的710 MHz天线进行联合仿真,结果显示加入耦合器后,两个天线间的耦合明显减小.这种设计使得该天线可以很好地应用于LTE通信系统的移动终端.%In order to improve the capacity and transceiving vocitey of antennas, MIMO antenna is used in LTE sysyem. But design and implementation of multiple antennas for small portable terminals become a serious technical challenge. Especially at low frequencies * because there is more couping between antennas. Therefore, a systematic approach for the design of lossless decoupling based on 180° directional couplers is proposed for the coupleing of two antennas. HFSS and ADS are a-dopted for the simulation of 710 MHz antenna. It is found that the isolation between antennas increases, which makes it suitable for LTE-standardized mobile phones.
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