本文選題：電視發(fā)射天線 + E型貼片�。� 參考：《大連海事大學(xué)》2017年碩士論文

【摘要】：傳統(tǒng)的數(shù)字電視發(fā)射天線體積龐大、調(diào)試復(fù)雜、加工難度較高,成本較昂貴。因此研究體積小、成本低、易調(diào)試的數(shù)字電視發(fā)射天線具有重要的應(yīng)用價值。在廣播電視發(fā)射系統(tǒng)中,由于發(fā)射功率較大,發(fā)射通道的少許反射都會對發(fā)射機(jī)末端造成損害,一般要求回波損耗要大于20 dB(丙級)。而對于移動通信系統(tǒng)而言,回波損耗大于10 dB即可。因此,對數(shù)字電視發(fā)射系統(tǒng)的匹配技術(shù)要求比移動通信系統(tǒng)更加嚴(yán)格,這也是設(shè)計中的最大難點(diǎn)。論文的主要工作有:(1)提出將微帶結(jié)構(gòu)的天線應(yīng)用于電視發(fā)射系統(tǒng),設(shè)計出一種工作頻率為600 MHz的基于E型貼片疊層的微帶單元天線,減小了傳統(tǒng)電視發(fā)射天線的體積。為驗證方法的有效性,進(jìn)行了實(shí)物加工和測試。測試結(jié)果表明:天線回波損耗大于23 dB的相對阻抗帶寬達(dá)到了 18.2%(頻率范圍544 MHz～653 MHz);中心頻率處天線增益為9.23 dBi。(2)為了獲得更高的天線增益,設(shè)計并制作了工作頻率為700 MHz的疊層微帶天線陣,測試了中心頻率和邊緣頻率特性。測試結(jié)果與仿真結(jié)果吻合,驗證了天線陣設(shè)計方法的有效性。在625.1MHz～775.0 MHz頻率范圍內(nèi),回波損耗都大于20 dB,最大增益值為12.05 dBi。(3)根據(jù)微帶天線功率容量的相關(guān)理論與公式對設(shè)計的兩款天線進(jìn)行理論計算,得到天線的平均功率容量和峰值功率容量。實(shí)際測量時,給天線輸入1kW的功率,連續(xù)工作二十四個小時沒有發(fā)現(xiàn)任何異常,說明所設(shè)計的基于微帶結(jié)構(gòu)的數(shù)字電視發(fā)射天線可以應(yīng)用于電視發(fā)射系統(tǒng)。
[Abstract]:The traditional digital television transmitting antenna has a large volume, complicated debugging, high processing difficulty and expensive cost. Therefore, it is of great application value to study the digital television transmitting antenna with small size, low cost and easy debugging. In the radio and television transmitting system, a little reflection of the transmitting channel will be to the end of the transmitter due to the large transmitting power. The return loss is generally required to be greater than 20 dB (c). For mobile communication systems, the return loss is greater than 10 dB. Therefore, the matching technology for the digital television transmission system is more stringent than the mobile communication system. This is also the most difficult point in the design. The main work of this paper is: (1) the microstrip structure is proposed. The antenna is applied to the TV launch system, and a microstrip antenna with a E type lamination based on 600 MHz is designed to reduce the volume of the traditional TV transmitting antenna. In order to verify the effectiveness of the method, the material is processed and tested. The test results show that the relative impedance bandwidth of the antenna echo loss is greater than 23 dB is reached. 18.2% (frequency range from 544 MHz to 653 MHz) and the antenna gain of 9.23 dBi. (2) at the center frequency to gain higher antenna gain, a stacked microstrip antenna array with a working frequency of 700 MHz is designed and fabricated. The center frequency and the edge frequency characteristics are tested. The test results are in agreement with the simulation results, and the effectiveness of the antenna array design method is verified. In the range of 625.1MHz to 775 MHz, the return loss is more than 20 dB and the maximum gain value is 12.05 dBi. (3). According to the theory and formula of the power capacity of the microstrip antenna, the average power capacity and the peak power capacity of the antenna are calculated. In actual measurement, the input power of the antenna to the antenna is continuous, and the power of the antenna is continuous in the 1kW. No abnormalities were found for twenty-four hours, indicating that the designed digital TV transmitting antenna based on microstrip structure can be applied to the TV transmitting system.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TN948.52

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