泄漏同轴电缆单槽口下反射系数的推导及计算

发布时间：2018-10-22 10:33

【摘要】：泄漏同轴电缆(简称漏缆)由于同时具有连续天线和传输线的特性,广泛应用于地下交通、矿井等闭域或者半闭域空间中。随着未来智能高速公路、物联网、4G通信网络的发展,对泄漏同轴电缆的性能要求也越来越高,尤其对使用频带的需求越来越高,因此,扩展使用频带的研究将是一个趋势。然而在去除谐振点来扩展使用频带中,如果能够得到泄漏同轴电缆开有单槽口下的反射系数具体解析表达式,进而求出总的反射系数解析表达式,就可以从理论上找到去除谐振点的有效方法。首先大致的介绍了泄漏同轴电缆的基本结构,并从基本结构出发,介绍了漏缆的一些特性,详细介绍了漏缆的两个重要电性参数耦合损耗系数与传输损耗系数。之后,从单槽口辐射电磁波的原理出发,详细的研究了周期性开槽口下的电磁波辐射原理,及着重介绍了漏缆的使用频带,并推导总结了多种开槽口情况下利用抑制高次模式波型来扩展使用频带的方法。最后利用互易定理对单槽口情况下的反射进行了详细分析,并利用解析法求出了单槽口下的反射系数,给出了具体例算结果及与开槽口结构参数之间关系的分析。后续又详细推导出了各种情况下周期性开槽口的总的反射系数,并利用得出的公式研究出了一些去除谐振点的方法,为进一步扩展使用频带打下了理论基础。
[Abstract]:Leaky coaxial cable is widely used in underground traffic, mine and other closed or semi-closed space because of the characteristics of continuous antenna and transmission line. With the development of intelligent highway, Internet of things and 4G communication network, the performance requirements of leaky coaxial cable are becoming higher and higher, especially the demand of frequency band. Therefore, the research on expanding the use of frequency band will be a trend. However, in order to extend the frequency band by removing the resonance point, if we can obtain the analytical expression of the reflection coefficient under the single slot opening of the leaky coaxial cable, then the analytical expression of the total reflection coefficient can be obtained. An effective method to remove the resonance point can be found theoretically. Firstly, the basic structure of leaky coaxial cable is introduced, and from the basic structure, some characteristics of leakage cable are introduced, and the coupling loss coefficient and transmission loss coefficient of two important electrical parameters of leakage cable are introduced in detail. Then, based on the principle of electromagnetic wave radiation from single slot port, the principle of electromagnetic wave radiation under periodic slot port is studied in detail, and the frequency band of leakage cable is introduced emphatically. The methods to expand the frequency band by suppressing the high order mode wave form are deduced and summarized in the case of various grooves. At last, the reflection of single slot is analyzed in detail by using reciprocity theorem, and the reflection coefficient under single slot is calculated by analytic method. The results of concrete examples and the relationship between the reflection coefficient and the structural parameters of slot are given. Then the total reflection coefficients of periodic grooves under various conditions are derived in detail and some methods to remove resonance points are studied by using the formulas which lay a theoretical foundation for further expansion of the frequency band.
【学位授予单位】：哈尔滨工程大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM248.3

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