方向性系数 meaning in English
directivity factor
directivity of an antenna
pattern propagation factor
Examples
- 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。