【作者】 朱颖岚；

【导师】 郭辉萍；

【作者基本信息】 苏州大学 ， 电子与通信工程， 2011， 硕士

【摘要】 对于调幅广播发射台,不同频道发射天线的距离在一定范围内时,由于天线之间互耦的问题,一个天线所发射的电磁波对周围天线必然会造成影响,这个影响的大小取决于天线的尺寸、间距、排列方式及地面状况等因素。换句话说,如果不同频道发射天线距离选择不当,就会对广播的效果造成严重影响。本文的主要工作就是研究中波526.5kHz～1606.5kHz频段范围内广播发射天线不同的间距和排列方式对天线方向特性的影响,并得到有益的结论,这对中波广播发射系统的选址及搬迁等具有重大意义。论文分为六个部分。首先,论文介绍了中波广播发射天线的研究背景、意义和发展现状。其次,论文介绍天线在无线电系统中的作用,天线的基本参数,互耦对天线方向特性的影响以及Ansoft HFSS软件的建模仿真的方法。再次,论文讨论了两个不同频率天线,在不同的间距条件下它们之间的相互影响,给出了它们的变化规律。然后,论文研究了三个不同频率天线,在不同的排列方式及不同间距条件下天线方向图,总结出它们的变化规律,给出了有益的结论。接着,论文讨论了四个不同频率天线,在不同的排列方式及间距条件下天线方向图,总结出它们的变化规律,给出了有益的结论。最后,对全文的工作加以总结,并对未来相关研究工作做了展望。更多还原

【Abstract】 For the medium wave broadcast transmitters, within a certain distance, Channels with different ranges will have impacts on each other due to the mutual coupling between the antennae. These impacts are determined by the antenna sizes, spacing, way of arrangement, the ground conditions and other factors. In other words, inappropriate distance between different transmitting antennae has a serious negative effect on the broadcasts. This article is to study the 526.5kHz ~ 1606.5kHz frequency range of medium-wave radio transmitting antennas of different spacing and arrangement of the antenna performance impact, and has been useful conclusions,which is significant to the site selection and relocation of medium wave broadcast transmitting system.The article is divided into six parts. The first part describes the study of background, significance and current development status of medium wave broadcast transmitting system.The second part introduces the functions and basic parameters of antennae in radio systems; effects of mutual coupling on Directional Sensitivity; and the modeling and simulation of Ansoft HFSS.The third part discusses two different frequency antennas, different spacing conditions in the interaction between two antennas, given their variation.The forth part examined three different frequency antennas, arranged in different ways and under different spacing antenna pattern, summed up the changes of them, gives useful conclusions.The sixth part discusses four different frequency antennas, arranged in different ways and pitch conditions, the antenna pattern, summed up the changes of them, gives useful conclusions.The last part conclusions and prospects of future developments will be made at the end of the article.更多还原