| 摘要: |
| 研究了一种应用于卫星通信地面站的新型单臂平面螺旋天线,该天线采用圆柱螺旋激励同轴线馈电,可以形成倾斜的波束,通过改变圆柱螺旋的参数可以调整其输入阻抗以达到阻抗匹配的目的.用矩量法求解了天线的电流分布和三维辐射方向图以及增益轴比等参数,计算结果与参考文献很吻合.为了增强天线的方向性系数和增益,以四元天线阵为例,研究了这种天线组成的天线阵的辐射特性,给出了天线阵的三维辐射方向图.计算结果表明,该天线组成的天线阵同样具有倾斜的波束指向,各天线单元的输入阻抗为接近50 Ω的纯电阻,增益比单个天线单元提高6.3 dB. |
| 关键词: 卫星通信 地面站 螺旋天线 天线阵 倾斜波束 矩量法 |
| DOI：10.3969/j.issn.1001-893X. |
| 投稿时间：2006-07-27修订日期：2006-12-20 |
| 基金项目:航空基础科学基金
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西安建筑科技大学校科研和教改项目 |
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| A Novel Monofilar Spiral Antenna and its Array for Ground Station in Satellite Communications |
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| Abstract: |
| A novel monofilar spiral antenna for ground station in satellite communications is studied,which forms a tilted fan beam and is excited through a helical wire and fed by a coaxial line. The input impedance can be modified by properly setting the parameters of the helical wire for impedance matching. The current distributions and 3 dimensional radiated patterns as well as gain and axial ratio are calculated through the moment method. The results agree with the references. To improve the directivity and gain of the antenna, an array composed of 4 elements is analyzed. The results show that the array can also form a tilted beam and the input impedance of each element is close to 50 12. The 6.3 dB gain can be improved . |
| Key words: satellite communication ground station spiral antenna antenna array tilted fan beam moment method |
《电讯技术》编辑部 