泄漏同軸電纜單槽口下反射系數(shù)的推導(dǎo)及計(jì)算
[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.
【學(xué)位授予單位】:哈爾濱工程大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:TM248.3
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