Ku波段双极化天线研究
发布时间：2018-12-16 02:38
【摘要】：随着电子通信领域特别是卫星通信的快速发展,Ku波段双极化天线的研究成为了热点。波导缝隙天线已广泛的运用于导弹、飞机等高速运动的飞行器领域,其突出的优越性,同样适用于卫星通信领域。 本文探讨了矩形波导缝隙的辐射机理,波导缝隙的各种形式以及对应形式的理论分析方法。分析了波导阵列的结构特点以及泰勒口径分布理论,并且编写了MATLAB程序实现了对泰勒分布各线源激励电流分布的计算。 设计了一种+45°双线极化波导缝隙天线。通过腔体结构实现波导缝隙极化方向的改变,设计了辐射单元结构。耦合缝隙采用“之”字型结构,解决了脊波导背面中心馈电的问题。对辐射缝隙的有源导纳以及耦合缝隙的有源阻抗的提取给出了详细的理论推导过程,并通过仿真计算,最终得出了有源导纳以及有源阻抗的计算公式,简化了设计过程。设计了驻波线阵并且实现了对线阵单元的口径控制,8元线阵增益达到15.35dB,副瓣电平满足设定的-20dB的要求。设计了8*8单元的双极化天线,天线总体尺寸约为160mm*160mm*14mm,增益为22.5dB,并且运用泰勒口径分布降低了天线的E面、H面的副瓣电平,实现了设计的要求。 为了减小双极化天线的体积并且避免使用腔体结构,设计了一种用双极化馈源馈电的波导缝隙天线。重点研究了双极化馈源的设计,得到了性能优越的双极化馈源。用方波导替代矩形波导做耦合波导,根据方波导表面电流分布特点,对不同的耦合缝隙形式进行了分析。
[Abstract]:With the rapid development of electronic communication field, especially satellite communication, the research of Ku band dual polarization antenna has become a hot spot. Waveguide slot antenna has been widely used in the field of missile, aircraft and other high-speed moving aircraft, its outstanding advantages, also applicable to the field of satellite communications. In this paper, the radiation mechanism of the rectangular waveguide slot, the various forms of the waveguide slot and the theoretical analysis method of the corresponding form are discussed. The structure characteristics of the waveguide array and the theory of Taylor aperture distribution are analyzed, and the MATLAB program is written to realize the calculation of the exciting current distribution of each line source of the Taylor distribution. A 45 掳dual-line polarized waveguide slot antenna is designed. The radiation element structure is designed by changing the polarization direction of the waveguide slot through the cavity structure. The coupling slot adopts the "zigzag" structure, which solves the problem of the center feed on the back of the ridge waveguide. The theoretical derivation process of active admittance of radiation slot and the extraction of active impedance of coupling slot are given. Finally, the formulas of active admittance and active impedance are obtained by simulation, which simplifies the design process. The standing wave linear array is designed and the aperture control of the linear array unit is realized. The gain of 8 element linear array reaches 15.35 dB, and the sidelobe level meets the requirement of-20dB. A dual-polarization antenna with 8 / 8 element is designed. The total size of the antenna is about 160 mm / 160mm / 14mm and the gain is 22.5 dB. The E plane and H plane sidelobe level of the antenna are reduced by using Taylor's aperture distribution, and the design requirements are fulfilled. In order to reduce the volume of dual-polarization antenna and avoid the use of cavity structure, a waveguide slot antenna fed by double-polarization feed is designed. The design of double polarization feed is studied, and the double polarization feed with superior performance is obtained. The rectangular waveguide is used as the coupling waveguide instead of the square waveguide. According to the characteristics of the surface current distribution of the square waveguide, different coupling slot forms are analyzed.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN821.1
本文编号：2381704
[Abstract]:With the rapid development of electronic communication field, especially satellite communication, the research of Ku band dual polarization antenna has become a hot spot. Waveguide slot antenna has been widely used in the field of missile, aircraft and other high-speed moving aircraft, its outstanding advantages, also applicable to the field of satellite communications. In this paper, the radiation mechanism of the rectangular waveguide slot, the various forms of the waveguide slot and the theoretical analysis method of the corresponding form are discussed. The structure characteristics of the waveguide array and the theory of Taylor aperture distribution are analyzed, and the MATLAB program is written to realize the calculation of the exciting current distribution of each line source of the Taylor distribution. A 45 掳dual-line polarized waveguide slot antenna is designed. The radiation element structure is designed by changing the polarization direction of the waveguide slot through the cavity structure. The coupling slot adopts the "zigzag" structure, which solves the problem of the center feed on the back of the ridge waveguide. The theoretical derivation process of active admittance of radiation slot and the extraction of active impedance of coupling slot are given. Finally, the formulas of active admittance and active impedance are obtained by simulation, which simplifies the design process. The standing wave linear array is designed and the aperture control of the linear array unit is realized. The gain of 8 element linear array reaches 15.35 dB, and the sidelobe level meets the requirement of-20dB. A dual-polarization antenna with 8 / 8 element is designed. The total size of the antenna is about 160 mm / 160mm / 14mm and the gain is 22.5 dB. The E plane and H plane sidelobe level of the antenna are reduced by using Taylor's aperture distribution, and the design requirements are fulfilled. In order to reduce the volume of dual-polarization antenna and avoid the use of cavity structure, a waveguide slot antenna fed by double-polarization feed is designed. The design of double polarization feed is studied, and the double polarization feed with superior performance is obtained. The rectangular waveguide is used as the coupling waveguide instead of the square waveguide. According to the characteristics of the surface current distribution of the square waveguide, different coupling slot forms are analyzed.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN821.1
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