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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 field strength in free space ： ウィキペディア英語版 Dipole field strength in free space Dipole field strength in free space, in telecommunications, is the electric field strength caused by a half wave dipole under ideal conditions. The actual field strength in terrestrial environments is calculated by empirical formulas based on this field strength. == Power density == Let N be the effective power radiated from an isotropic antenna and p be the power density at a distance d from this source〔''Reference data for radio Engineers'', Howard W.Sams co,Indianapolis, 1956, 27-7〕 :$\backslash mbox\; =\; \backslash frac$ Power density is also defined in terms of electrical field strength; Let E be the electrical field and R be the impedance of the free space :$\backslash mbox\; =\; \backslash frac$ The following relation is obtained by equating the two, :$\backslash frac=\; \backslash frac$ or by rearranging the terms :$\backslash mbox\; =\backslash frac\}$ 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「Dipole field strength in free space」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.