摘要
用实数形式的电偶极子电磁场表达式,计算了电偶极子天线的平均能流密度和辐射电阻,纠正了近期一篇论文的错误.计算结果表明:不论考虑还是忽略电磁场的1/r高次幂项,电偶极子的平均能流密度和辐射电阻都是一样的;也就是说,电偶极子电磁场的1/r高次幂项是束缚电磁波,对平均能流密度和辐射电阻没有贡献,在这个意义上讲,教科书的辐射电阻公式Rr=2π/(3cε0)(l/λ)2是精确的.
Abstract： By using the real expression of the electric dipole electromagnetic field, the average energy flow density and the radiation resistance of the electric dipole are calculated. The mistake from a recent literature is corrected. It is shown that the radiation resistance is the same whether consider or ignore the higher order terms of 1/r in the electric dipole electromagnetic field. That is to say, the higher order terms of 1/r in the electric dipole electromagnetic field energy flow density and the radiation resistance. textbooks is accurate. are bound wave, which do not contribute to the average In this sense, the formula Rr=2n/（3c0）（//R）2in the
出处
《广东第二师范学院学报》
2013年第3期41-44,共4页
Journal of Guangdong University of Education
基金
广东第二师范学院科研项目(2012yjxm01)
关键词
电偶极子
天线
电磁场
平均能流密度
辐射电阻
electric dipole
antenna
electromagnetic field
average energy flow density
radiationresistance
