广东工业大学学报 ›› 2012, Vol. 29 ›› Issue (1): 1-4.

• 综合研究 •    下一篇

关于电磁波能速问题的讨论

  

  1.  广东工业大学 物理与光电工程学院,广东  广州  510006
  • 出版日期:2012-03-25 发布日期:2012-03-25
  • 作者简介:林福民(1964-),男,教授,主要研究方向为物理电子学、电磁场与微波技术.
  • 基金资助:

    国家自然科学基金资助项目(60671060);广东工业大学教育教学改革重点项目(2010Z015,2010Z019)

On the Energy Velocity of Electromagnetic Waves

  1. Faculty of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China
  • Online:2012-03-25 Published:2012-03-25

摘要: 摘要:指出了只有针对具有特定频率和波矢的一列电磁波定义能速才有明确意义,并对此作些说明和论证.通过计算无界线性介质和典型传输线中电磁波的平均能速和相速,得出结论:当电磁波在线性介质中以横电磁波(TEM)模式传播时,其平均能速总是等于相速;若在传输线中以横电波的mn模(TEmn)或横磁波的mn模(TMmn)传输时,其平均能速在波阵面上各点的大小不同,且都小于相速和真空光速.

关键词: 一列电磁波;能速;相速;传输线;传输模式

Abstract: It was pointed out that the definition of energy velocity has clear meaning only for a ray of electromagnetic waves with definite frequency and wave vector. Then, some explanation and proof were provided.  By calculating the average energy velocities and the phase velocities of electromagnetic waves in boundless linear media and typical transmission lines, it arrives at the conclusion that:when the electromagnetic wave propagates through linear media by TEM mode, the average energy velocity equals the phase velocity; if electromagnetic waves are transmitted by the TEmn mode or TMmn mode through a transmission line, the average energy velocity is variable on the wave front, and it is always lower than the phase velocity or the speed of light in the vacuum.

Key words: a ray of electromagnetic waves; energy velocity; phase velocity ; transmission lines; transmission mode

[1] 张映辉,陈季香.能量速度与相速之间关系的讨论[J].陕西工业学院学报,2002,18(2):73-75.

[2] 文盛乐,刘健智.有关电磁波传播中几种速度的定义及其关系的讨论[J].湖南文理学院学报:自然科学版,2008,20(1):27-29.

[3] 黄志洵.电磁波经典波速理论及存在问题[J].北京广播学院学报:自然科学版,2004,11(2):1-11.

[4] 徐金宏. 波列的群速与相速[J]. 聊城师院学报:自然科学版,2002,15(4):90-92.

[5] Biot M A. The equivalence of group velocity and energy transport[J].Phys Rev, 1957, 105:1127.

[6] Brillouin L. Wave Propagation and Group Velocity[M]. New York: Academic Press, 1960.

[7] 陈宇.对于群速度和能速度关系的研究[J].中国科学A,1995, 25(3):261-267.

[8] 邵建军. 论群速相速概念与电磁波传播模式[J]. 湖北教育学院学报,2005,22(5):4-10.

[9] 张克潜,李德杰.微波与光电子学中的电磁理论 [M].2版.北京:电子工业出版社,2001.

[10]陈振国.微波技术基础与应用 [M].2版.北京:北京邮电大学出版社,2002.
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