方向性系数的英文

• directivity factor
• directivity of an antenna
• pattern propagation factor

• "方向性"英文翻译    directivity; directionality
• "系数"英文翻译    coefficient; ratio; modulus; ...
• "超方向性系数" 英文翻译 :    superdirectivity
• "天线方向性系数" 英文翻译 :    directivity of antenna
• "超方向性系数 超锐定向性 超指向性系数" 英文翻译 :    superdirectivity
• "指向性系数" 英文翻译 :    directivity factor
• "空间系数占空系数方向性系数" 英文翻译 :    space factor
• "强方向性系统" 英文翻译 :    highly directional antenna; highly directional system
• "超指向性系数" 英文翻译 :    superdirectivity
• "有效指向性系数" 英文翻译 :    effective directivity factor
• "方向性" 英文翻译 :    directivity; directionality
• "指向性, 方向性" 英文翻译 :    directivity
• "方向性定向性" 英文翻译 :    directionality
• "方向性定向性，指向性" 英文翻译 :    directivity
• "天线形状系数, 天线方向性因数" 英文翻译 :    antenna form factor
• "超方向性" 英文翻译 :    superdirective
• "垂直方向性" 英文翻译 :    height pattern; vertical directivity
• "地震方向性" 英文翻译 :    seismic directivity
• "发射方向性" 英文翻译 :    transmitting directivity
• "方向性比" 英文翻译 :    front to back ratio; front-to-back ratio
• "方向性动作" 英文翻译 :    directional operation
• "方向性反应" 英文翻译 :    vectorial reaction
• "方向性光源" 英文翻译 :    directional light
• "方向性函数" 英文翻译 :    directivity function
• "方向性计划" 英文翻译 :    directional plans

• Its band structure is analyzed . after the working frequency is selected , the meta - material cover increases the patch antenna ' s directivity by 9 . 14db
  在选定的工作频率，异向介质覆层将贴片天线的方向性系数提高了9 . 14db 。
• Phased - array radiation lobe is superposed by isometric array element with constant amplitude . using the concept of real and imaginary space , the scanning lobe is researched
  通过“实虚空间”的概念,分析了扫描中的阵列波瓣,总结给出相控阵天线的方向性系数。
• Its size is small ( with an unit length of about 23 . 7 % of the wavelength in the cover medium ) , and its effectiveness is evident ( the patch antenna ' s directivity is increased by 3 . 16db )
  这种结构具有尺寸小(边长仅为介质中波长的23 . 7 ) 、效果明显(将贴片天线的方向性系数提高了3 . 16db )的优点。
• Combining this pmc structure with the pbg cover maintained above , a new patch antenna with a pmc substrate and a pbg cover has been introduced for the first time . such a structure can increase the directivity more effectively ( the directivity is increased by 7 . 3db ) . 4
  结合这种pmc结构和第2点中提到的pbg覆层，首次设计出了具有pmc基底与pbg覆层的新型贴片天线，对方向性改进效果更加显著(将贴片天线的方向性系数提高了7 . 3db ) 。
• The result shows that the pbg structure has obvious character of forbidden band at the suitable size , and can be designed to good performance microwave filter . the pbg structure have the character of high resistance , that can reinforce the forward radiation , and reduce the backward radiation , increase the directivity , improve the gain and ameliorate the performance of the antenna . in addition , the pbg structure can also greatly increase the isolation and significantly decrease the coupling between the antenna elements
  研究结果表面，取合适的尺寸时， pbg结构具有明显的禁带特性，可以设计成性能良好的微波滤波器； pbg结构具有高阻特性，把这种特性用于微波天线时， pbg结构可以加强前向辐射，减小后向辐射，增大天线的方向性系数，从而提高天线的增益，改善天线的性能，另外， pbg结构还可以大大提高天线单元之间的隔离度，显著减小天线单元间的耦合。
• The performance of the pbg antenna using the new pbg cover together with a pbg substrate is studied by the fdtd method together with the pml boundary treatment . the numerical results show that a more focused beam radiated in the broadside direction is achieved . the gain of the pbg patch antenna in the forward direction is improved by about 6 db . the radiation directivity is improved significantly and reaches 11 . 5 db , which is 0 . 4 db less than the maximum value that is allowed physically for this size of the antenna ( this difference is about 4 . 1 db less than the difference achieved by thevenot et al . ,
  用fdtd方法并结合pml吸收边界条件，我们对加了这种新的覆层结构并且基底钻孔的复合结构电磁(光子)晶体贴片天线的性能进行了研究，结果证明加了这种新的电磁晶体覆层结构以后，天线的波束收拢很多，并且向前辐射的增益大大提高，与普通天线相比，天线的e面和h面方向图上向前辐射的增益均提高了约6db ，另外，该复合结构天线的方向性系数达到了11 . 5浙江大学博士学位论文db ，与该物理尺寸天线的方向性系数的理论极限值( 11 . 9db )相差0 . 4db ，该差值比thevenot等人设计的电磁晶体覆层天线的相应差值减少了约4 . 1db ，比qiu等人设计的电磁晶体天线的相应差值减少了约1
• Presented in this paper is the investigation of some problems existing in the far - field method widely used in hpm measurement . first , the errors are analyzed from the practical calculation of the directivity for the radiation of the te11 mode in the circular waveguide . secondly , the results obtained from simulation and experiments are compared with each other on the effective area of the receiving antenna of certain types , and the power capacity are calculated for these antenna
  首先,对圆波导te11主模辐射方向性系数实际计算中存在的误差进行了分析;其次,对一些型号的接收喇叭有效面积进行了模拟和实测对比,并通过计算给出了这些型号的接收喇叭的功率容量;最后,实验测定了微波脉宽对一些微波器件? ?同轴型检波器、同轴型衰减器及微波电缆性能的影响。
• The results show that in the case of the radiation of the pure te11 mode , dh is less than d with their difference ranging from 0 . 1db ~ 0 . 8db , and de is larger than d with a difference between - 1 . 9db and - 1db , and that in the case of the radiation of the mixed modes of te11 and tm01 with power proportions from 5 % to 30 % , dh is still close to d with the maximum difference less than 1db , while the difference between de and d can be as large as - 4db
  Te11模中含有一定量的tm01模式时,比如, tm01模式占功率比为5 - 30 % , dh仍接近模拟值d ,最大误差小于1db ;而d与de的最大差值将近- 4db 。可见, h面的方向性系数与实际的方向性系数偏差要小一些。
• In the circumstances of the te11 mode mixed with the given parasite modes , the errors from the practically used directivity can be corrected with the calculated difference between dh and d . the effective area of the receiving antenna is calculated with the established models , and measured at some points in the given frequency range
  在已知混入te11模式中杂模成份及其比例的情况下,可以通过计算出dh与d的差值,对采用的方向性系数进行误差修正。通过建立相应模型,对接收喇叭的有效面积进行了计算,并在部分频率点上进行了实测。
• The antenna gain , directivity and reflection coefficient are calculated via finite element method in hfss . spline interpolation and polynomial curve fitting are applied to construct diagrams illustrating the capsulation characteristics . some general conclusions of interest are obtained
  探讨了各个封装参数对输入端反射系数、方向性系数、效率和增益等性能指标的影响，得到一些规律性结论，为射频振子天线的封装应用提供了参考性的建议，并指出了进一步研究的方向。

• 方向性系数的日语：しこうけいすう しこうせいりつ