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首页> 外文期刊>Microwave and optical technology letters >BROADBAND COMPACT QUASI-YAGI ANTENNA FOR INDOOR DIGITAL TV
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BROADBAND COMPACT QUASI-YAGI ANTENNA FOR INDOOR DIGITAL TV

机译：室内数字电视的宽带宽带准拟矢天线

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摘要

In this article, a design method for a broadband three-element quasi-Yagi antenna for indoor digital television (DTV) is presented. The antenna consists of a dipole fed by a coplanar strip (CPS) line, a rectangular patch-type director, and a ground reflector. The transition between a microstrip (MS) feed line and the CPS line is implemented on the CPS to match the input impedance of the antenna with a 75-Ω MS feed line. The impedance bandwidth is improved by appending a wide strip-type patch director at a location close to the dipole driver. The antenna size is reduced by using a half bow-tie-shaped dipole and reflector. The antenna is designed and optimized for operation in the terrestrial DTV band (470-806 MHz) and is fabricated on an FR4 substrate. Although, the antenna size (240 mm by 200 mm) corresponds only to 0.36λ_0 by 0.30λ_0 (λ_0; free space wavelength at 450 MHz), the experiment results show that the antenna has good performance, such as a wide impedance band of 450-848 MHz for a voltage standing wave ratio<2, a moderate gain of 3.5-4.6 dBi, and a high front-to-back ratio>10.4 dB.
机译：本文介绍了一种用于室内数字电视（DTV）的宽带三元准八木天线的设计方法。天线由共面带（CPS）线馈电的偶极子，矩形贴片型导向器和地面反射器组成。微带（MS）馈线和CPS线之间的过渡是在CPS上实现的，以使天线的输入阻抗与75ΩMS馈线匹配。通过在靠近偶极驱动器的位置附加一个宽条形的贴片导向器，可以改善阻抗带宽。通过使用半领结形偶极子和反射器来减小天线尺寸。天线是针对地面DTV频段（470-806 MHz）中的操作进行设计和优化的，并在FR4基板上制造。尽管天线尺寸（240 mm x 200 mm）仅对应于0.36λ_0x0.30λ_0（λ_0; 450 MHz处的自由空间波长），但实验结果表明，该天线具有良好的性能，例如450的宽阻抗带电压驻波比<2，中等增益3.5-4.6 dBi和高前后比> 10.4 dB时为-848 MHz。

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