数字电视发射宽带天线阵的设计

发布时间：2018-05-28 12:01

本文选题：数字电视发射天线 + 宽频带　；参考：《大连海事大学》2017年硕士论文

【摘要】：随着2012年我国《地面数字电视广播覆盖网发展规划》的出台,地面数字电视的推广和应用被提高到战略的高度。数字电视发射天线作为地面无线传输设备中的重要组成部分,直接影响着电视广播的质量。其中宽频段、高增益的数字电视发射天线占用空间资源少、覆盖范围广,并且可满足多频道同时广播,从而有效的降低运营成本。因此,研究这种天线具有十分重要的意义。辽宁普天数码股份有限公司委托大连海事大学天线微波研究所研发宽带、高增益的数字电视发射天线。论文正是在该项目的支持下完成的。论文完成的的主要工作有:(1)设计并实现了一款UHF频段的四偶极子单元板天线。单元天线采用圆柱形偶极子,由两个单元天线并联为一组,构成二元阵列。两组二元阵列通过T型功分器进行馈电,构成四偶极子单元板天线。在设计单元天线时,通过引入一种补偿巴伦结构,展宽单元天线的频带。在T型功分馈电网络中加入多节复阻抗变换器,实现单元板天线的宽带匹配。该天线仿真表明具有36%(543～783MHz)的相对带宽(VSWR1.15),工作频带内增益大于12.5dBi。实测的相对带宽为58.6%(470～860MHz),增益与仿真结果基本吻合。(2)实际工程中通常运用多面组合技术,实现对水平面场型的控制。论文分别对三种实现水平全向性的工程措施进行了理论与仿真分析。通过对不同电视塔宽、不同放置方式和馈电方式的水平方向性图的圆度数据的归纳总结,给出论文设计天线在实际工程中的合理布置方式。(3)对垂直面电气波束下倾和机械波束下倾两种方式进行了理论分析,并通过软件的仿真对理论计算结果进行验证。对两种波束下倾方式的垂直方向性图进行对比,给出论文设计天线的合理波束下倾方式。
[Abstract]:With the coming out of the "Development Plan of Terrestrial Digital Television Broadcasting overlay Network" in 2012, the promotion and application of terrestrial digital television has been raised to a strategic height. As an important part of terrestrial wireless transmission equipment, digital television transmitting antenna directly affects the quality of television broadcasting. In the broadband band, the high-gain digital TV transmitting antenna occupies less space resources, covers a wide range, and can meet the multi-channel broadcast simultaneously, thus effectively reducing the operating cost. Therefore, it is very important to study this kind of antenna. Liaoning Putian Digital Co., Ltd. commissioned Dalian Maritime University Antenna Microwave Research Institute to develop broadband, high gain digital television transmitting antenna. The paper was completed under the support of the project. The main work of this paper is to design and implement a four-dipole unit board antenna in UHF band. The element antenna consists of a cylindrical dipole and two element antennas are connected in parallel to form a binary array. Two groups of binary arrays are fed by T-type power divider to form a four-dipole unit board antenna. In the design of element antenna, a compensating Barron structure is introduced to broaden the frequency band of element antenna. A multi-section complex impedance converter is added to the T type power division feed network to realize the broadband matching of the unit board antenna. The simulation of the antenna shows that the relative bandwidth of VSWR is 1. 15 and the gain in the operating band is more than 12. 5 dBi. The measured relative bandwidth is 470,860MHz, and the gain is in good agreement with the simulation results.) in practical engineering, multi-plane combination technique is usually used to control the horizontal plane field pattern. In this paper, three kinds of horizontal omnidirectional engineering measures are analyzed in theory and simulation. By summarizing the roundness data of horizontal directional diagram of different TV tower width, different placement mode and feed mode, The reasonable layout of antenna in practical engineering is given. The theoretical analysis of vertical plane electric beam downdip and mechanical beam downdip is carried out, and the theoretical calculation results are verified by software simulation. By comparing the vertical directional patterns of two kinds of beam downdip, the reasonable beam downdip mode of antenna design in this paper is given.
【学位授予单位】：大连海事大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN948.52

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