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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Antenna equivalent radius ： ウィキペディア英語版 Antenna equivalent radius The equivalent radius of an antenna conductor is defined as:〔E.A. Wolff, ''Antenna Analysis'', Chapter 3, John Wiley & Sons, New York, NY, Second Edition, 1966.〕 $$ r_e = \exp\left\ - \boldsymbol \vert \; dx \; dy \right\} where $\backslash scriptstyle\backslash ell$ denotes the conductor's circumference, $\backslash scriptstyle$ is the length of the circumference, $\backslash scriptstyle\}$ are vectors locating points along the circumference, and $\backslash scriptstyle$ and $\backslash scriptstyle$ are differentials segments along it. The equivalent radius allows the use of analytical formulas or computational or experimental data derived for antennas constructed from small conductors with uniform, ''circular'' cross-sections to be applied in the analysis of antennas constructed from small conductors with uniform, ''non-circular'' cross-sections. Here "small" means the largest dimension of the cross-section is much less than the wavelength $\backslash scriptstyle$. == Formulas == The following table lists equivalent radii for various conductor cross-sections derived assuming 1) all dimensions are much less than $\backslash scriptstyle$, 2) for cross-sections composed of multiple conductors, the distances between conductors are much greater than any single conductor dimension. The formula for the flat, infinitely thin conductor is a closed-form solution. Formulas for the square and triangular cross-sections follow from numerical evaluation of the double integral. \right\} |- | align="center"| 200px ! align="center"| Equilateral triangle, identical circular conductors | align="center"| $\backslash left(\; rs^2\; \backslash right)^$ |- | align="center"| 200px ! align="center"| Square, identical circular conductors | align="center"| $\backslash left(\; \backslash sqrt\backslash ,rs^3\; \backslash right)^$ |- | align="center"| 200px ! align="center"| Pentagon, identical circular conductors | align="center"| $\backslash left(\; 2.62\backslash ,rs^4\; \backslash right)^$ |- | align="center"| 200px ! align="center"| Hexagon, identical circular conductors | align="center"| $\backslash left(\; 6\backslash ,rs^5\; \backslash right)^$ |- | align="center"| 230px ! align="center"| Approximate cylinder, identical circular conductors, conductors uniformly spaced | align="center"| $\backslash left(\; N\; r\; R^\; \backslash right)^$ |- | align="center"| 200px ! align="center"| Flat conductor, infinitely thin | align="center"| $\backslash displaystyle$ |- | align="center"| 200px ! align="center"| Square conductor | align="center"| $\backslash displaystyle$ |- | align="center"| 200px ! align="center"| Equilateral triangle conductor | align="center"| $\backslash displaystyle$ |} 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Antenna equivalent radius」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.