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问:近区场是否即感应场? 答:根据电磁场理论,在点辐射源周围,1/6波长是以感应场为主区域和以辐射场为主区域的分界线,即小于1/6波长区域称为感应场,大于1/6波长区域称为辐射场。例如,对于高频波段,是以1/6波长为界区分感应场和辐射场。在这种情况下,通常又把感应场称为近区场,把辐射场称为远区场。此外,当辐射体不能视为点源时,应以2D~2/λ区分近区场和远区场。例如,对微波段,在2D~2/λ区域内为近区场,大于2D~2/λ的区域称为远区场,式中D为天线反射器直径,或天线上两点间的最大距离,λ为工作波长。
Q: Is the near-field field an inductive field? A: According to the electromagnetic field theory, around the point sources, the 1/6 wavelength is the demarcation line that takes the induction field as the main area and the radiation field as the main area, ie, less than 1/6 wavelength Area called the induction field, more than 1/6 wavelength region called the radiation field. For example, for a high-frequency band, the induction field and the radiation field are differentiated by 1/6 wavelength. In this case, the induction field is usually called the near field and the radiation field as the far field. In addition, when the radiator can not be regarded as a point source, the near field and the far field should be distinguished by 2D ~ 2 / λ. For example, in the microwave region, the near-field in 2D ~ 2 / λ and the far-field in more than 2D ~ 2 / λ, where D is the reflector diameter of the antenna or the maximum between two points on the antenna Distance, λ is the working wavelength.