基于微带结构的数字电视发射天线设计

发布时间：2018-05-16 21:31

本文选题：电视发射天线 + E型贴片　；参考：《大连海事大学》2017年硕士论文

【摘要】：传统的数字电视发射天线体积庞大、调试复杂、加工难度较高,成本较昂贵。因此研究体积小、成本低、易调试的数字电视发射天线具有重要的应用价值。在广播电视发射系统中,由于发射功率较大,发射通道的少许反射都会对发射机末端造成损害,一般要求回波损耗要大于20 dB(丙级)。而对于移动通信系统而言,回波损耗大于10 dB即可。因此,对数字电视发射系统的匹配技术要求比移动通信系统更加严格,这也是设计中的最大难点。论文的主要工作有:(1)提出将微带结构的天线应用于电视发射系统,设计出一种工作频率为600 MHz的基于E型贴片叠层的微带单元天线,减小了传统电视发射天线的体积。为验证方法的有效性,进行了实物加工和测试。测试结果表明:天线回波损耗大于23 dB的相对阻抗带宽达到了 18.2%(频率范围544 MHz～653 MHz);中心频率处天线增益为9.23 dBi。(2)为了获得更高的天线增益,设计并制作了工作频率为700 MHz的叠层微带天线阵,测试了中心频率和边缘频率特性。测试结果与仿真结果吻合,验证了天线阵设计方法的有效性。在625.1MHz～775.0 MHz频率范围内,回波损耗都大于20 dB,最大增益值为12.05 dBi。(3)根据微带天线功率容量的相关理论与公式对设计的两款天线进行理论计算,得到天线的平均功率容量和峰值功率容量。实际测量时,给天线输入1kW的功率,连续工作二十四个小时没有发现任何异常,说明所设计的基于微带结构的数字电视发射天线可以应用于电视发射系统。
[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.
【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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