Each segment of line current can be approximated as a hertzian dipole if each segment is much smaller then a wave length 因此任意线电流在三度空间之三维向量电磁场即可以赫芝电偶极完整之远场及近场近似合成之。
The near and far electromagnetic field are synthesized by summation of the electromagnetic field of short current segments or hertz dipoles 以很多小段赫芝偶极之完整电磁场合成一任意线电流之近场与远场电磁场。
The negative refraction and superprism in photonic crystals are promising for the near field image and wavelength demultiplexing system 光子晶体中的负折射、超棱镜效应在近场成像、波分复用系统中具有潜在的用途。
Based on the demand for noise control and protection , a study on the noise diffuse and intensity of military aircraft is carried out 摘要为满足军用飞机近场噪声的控制和防护需求，对飞机噪声的传播和分布特性进行研究。
With wide stripes , however , higher order lateral modes are generally dominant as seen in the near - field micrograph of fig . 7 . 7 . 1 但是，当条形较宽时，一般都是高阶横模占优势，这可以从图7 7 1的近场显微照片看出来。
The elliptical polarized wave and two types of wave impedance in the near field of current sources of an electric and a magnetic hertz dipoles combination 一赫芝电偶极加上一赫芝磁偶极在近场之椭圆极向波与两种波阻抗。
A novel joint estimation algorithm for ranges , frequencies and doas of multiple near - field narrowband sources is proposed in the near field is proposed 摘要提出了一种新的多个近场窄带信源距离、频率及到达角三维参数的联合估计算法。
The working range of acoustic imaging system is short generally . so focusing has to be taken into account , or the result will be bad 声成像系统的作用距离通常都比较近，这种情况下就必须要考虑近场聚焦的问题，否则波束的指向性会老化。
The paper analyzed an s - band single ridged waveguide antenna used for near field measure by fdtd method and microwave transmition line theory 本文采用fdtd方法以及微波传输线理论对一个用于近场测量、工作在s波段的单脊波导天线进行了分析。
Finally , we introduced the phaseless near - field measurement method . this method needs not to measure near - field phases , and then lower the cost 另外，论文还对无相位的近场测量方法进行了介绍，该方法可以避免由于测量相位而带来的高成本。
