【作者】 王岩；

【导师】 顾长青； 鄢学全；

【作者基本信息】 南京航空航天大学 ， 电磁场与微波技术， 2006， 硕士

【摘要】 相控阵天线单元间由于互耦效应引起的反射功率损耗,随着扫描角的变化而随之发生变化,这给互耦补偿带来了极大地困难。相控阵天线是由成百上千个阵元组成,如果研究阵中所有阵元的互耦效应势必单台计算机难以完成。针对上述问题,本文首先通过阵列天线的实例仿真,验证了Ansoft HFSS的准确性,接着运用该软件通过S参数分析,提出了一种新型的阵列天线模型。此模型的中心阵元具有大型相控阵中阵元的一般特性,因此研究该阵列天线的中心阵元与周围阵元间的互耦效应,可近似等效为研究大型相控阵中一般阵元的互耦效应。最后,为了减小阵列中心阵元的反射电压,在阵元间互耦效应大的E面方向加置一层金属条块进行互耦补偿,讨论了不同扫描角下周围阵元对中心阵元的影响。结果发现,在不同扫描角下,中心阵元的反射电压得到减小,因此,达到了反射功率损耗减小,传向天线单元输入端功率增加,天线性能提高的目的。更多还原

【Abstract】 The mutual coupling between Phased Array Antennas elements causes the loss of reflected power. Following the changes of scanning angle, mutual coupling between elements will also change, so the comensation of mutual coupling should become difficult. Well, Phased Array Antennas is composed of thousands of elements. If the mutual coupling between each radiating unit is taken into account, it’s absolutely hard to de this work by single computer.Based on the questions above, firstly two examples of array antennas have been emulated, which validates the correctness of the commercial software Ansoft HFSS. Secondly, by analyzing parameter S, a new array antennas model has been presented in which the middle element has the same feature of that in large Phased Array Antennas. So we can only study the mutual coupling between the middle element and others around, that approximately equals to study the mutual coupling between the common elements. Finaly, to reduce the reflected volt of the middle element, namely compensating mutual coupling, we may put metal between the elements in its E-faces because in this place the mutual coupling effects is much more serious. At different scanning angles, by analyzing the effects that the surrounding elements on the middle one, we conclude that the reflected vote of the middle element decreases, that’s the loss of reflected power decrcases, so the input power will increase. Emulating results prove that this method is valid.更多还原