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用于特高频大功率广播的发射天线,要有适合于大功率的馈电设备,需要构造简单的高增益天线。本文研究这类天线形式之一的带反射板锯齿天线,了解清楚它的工作机构,还给出具体的设计方法。这种天线的特性是: (1) 适合于大功率。用WX-77D**系列作为馈电系统时,一付天线能承受7千瓦以上(670兆赫载波)的功率。(2) 一层四面组合无方向性天线能达到大约10分贝的高增益。(3) 阻抗频带宽度稍大于5%。(4) 假定了电流分布可理论地求出方向性。这种形式的天线在日本广播协会东京砧试验台实际使用过,取得了良好的结果。
The transmitting antenna used for UHF high-power broadcasting needs to have a high-gain antenna which is suitable for high-power feeding equipment. In this paper, one of the antenna form of reflection serrated antenna with a reflector to understand its working mechanism, but also gives the specific design method. The characteristics of this antenna are: (1) suitable for high power. With the WX-77D ** series as the feed system, one antenna can withstand more than 7 kW (670 MHz carrier) power. (2) A four-sided combination of non-directional antennas can achieve high gain of about 10 dB. (3) impedance bandwidth slightly larger than 5%. (4) It is assumed that the current distribution can theoretically determine the directivity. This form of antenna was actually used at the Japan Broadcasting Association Tokyo Anvil Test Bench and achieved good results.