In order to increase the power radiated the le
问题详情
In order to increase the power radiated,the length of the dipole has to be comparable to wavelength.The most widely used dipole is approximately half a wavelength long.The pattern of a half-wave dipole is similar to that of a very short dipole-it is a figure of eight. The half-power beam width in the figure of eight is about 78°,which is narrower than that of the very short dipole.If the length of the dipole is increased to one wavelength in the figure of eight.the half-power beam width is nOW about 47°.
参考答案
为了增加辐射功率，偶极天线的长度必须与波长相对比。使用最多的偶极天线的长度约为波长的一半。半波偶极天线的方向图与很短的偶极天线类似，为8字形。8字形的半功率波束宽度约为78°，比很短的偶极天线窄。如果偶极天线的长度增至一个波长，其方向图还是类似的形状，唯一不同点的是8字形半功率波束宽度约为47°。这是有关天线理论原理的科技文章，专业性很强。既有学科性强的纯科技词汇，如dipole(偶极天线)、wavelength(波长)，也有通用的词汇如power(功率)，但是通用词汇pattern应根据上下文翻译成“方向图”，而不是翻译成“框架”、“结构”。在句法上具有科技英语的显著特点——使用被动语态和长句。在被动语态句子(If the length of the dipole is increased to one wavelength in the figure of eight)翻译时，译文使用了汉语的主动结构，译成“如果偶极天线的长度增至一个波长”。
