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目前国内厂家随机配发的小功率电视差转机的全方向发射天线,几乎都是双层十字形的。原因是这种天线结构简单、造价低、架设方便。但这种天线增益太低,是其最大缺点。由理论计算和经验修正可知,双层十字形天线的方向性系数D(倍数)为1.3,功率增益G(dB)为1.2;而四层十字形天线的D(倍数)为2.6,G(dB)为4.2。这就表明,如果采用简便方法把双层十字形天线改为四层十字形天
At present, domestic manufacturers randomly allotted low-power TV transmission aircraft omni-directional transmitting antenna, almost all double-cross. The reason is that this antenna structure is simple, low cost, easy to set up. However, this antenna gain is too low, is its biggest drawback. Theoretical calculations and empirical corrections show that the directional coefficient D (multiple) of the double cross antenna is 1.3 and the power gain G (dB) is 1.2, while the D of the quadruplex antenna is 2.6 and G (dB ) Is 4.2. This shows that if the easy way to double crossover antenna to four cross-shaped days