本文選題：數(shù)字電視發(fā)射天線 + 寬頻帶　； 參考：《大連海事大學》2017年碩士論文

【摘要】：隨著2012年我國《地面數(shù)字電視廣播覆蓋網(wǎng)發(fā)展規(guī)劃》的出臺,地面數(shù)字電視的推廣和應用被提高到戰(zhàn)略的高度。數(shù)字電視發(fā)射天線作為地面無線傳輸設備中的重要組成部分,直接影響著電視廣播的質量。其中寬頻段、高增益的數(shù)字電視發(fā)射天線占用空間資源少、覆蓋范圍廣,并且可滿足多頻道同時廣播,從而有效的降低運營成本。因此,研究這種天線具有十分重要的意義。遼寧普天數(shù)碼股份有限公司委托大連海事大學天線微波研究所研發(fā)寬帶、高增益的數(shù)字電視發(fā)射天線。論文正是在該項目的支持下完成的。論文完成的的主要工作有:(1)設計并實現(xiàn)了一款UHF頻段的四偶極子單元板天線。單元天線采用圓柱形偶極子,由兩個單元天線并聯(lián)為一組,構成二元陣列。兩組二元陣列通過T型功分器進行饋電,構成四偶極子單元板天線。在設計單元天線時,通過引入一種補償巴倫結構,展寬單元天線的頻帶。在T型功分饋電網(wǎng)絡中加入多節(jié)復阻抗變換器,實現(xiàn)單元板天線的寬帶匹配。該天線仿真表明具有36%(543～783MHz)的相對帶寬(VSWR1.15),工作頻帶內增益大于12.5dBi。實測的相對帶寬為58.6%(470～860MHz),增益與仿真結果基本吻合。(2)實際工程中通常運用多面組合技術,實現(xiàn)對水平面場型的控制。論文分別對三種實現(xiàn)水平全向性的工程措施進行了理論與仿真分析。通過對不同電視塔寬、不同放置方式和饋電方式的水平方向性圖的圓度數(shù)據(jù)的歸納總結,給出論文設計天線在實際工程中的合理布置方式。(3)對垂直面電氣波束下傾和機械波束下傾兩種方式進行了理論分析,并通過軟件的仿真對理論計算結果進行驗證。對兩種波束下傾方式的垂直方向性圖進行對比,給出論文設計天線的合理波束下傾方式。
[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.
【學位授予單位】：大連海事大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TN948.52

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