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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 Mismatch loss ： ウィキペディア英語版 Mismatch loss Mismatch loss in transmission line theory is the amount of power expressed in decibels that will not be available on the output due to impedance mismatches and signal reflections. A transmission line that is properly terminated, that is, terminated with the same impedance as that of the characteristic impedance of the transmission line, will have no reflections and therefore no mismatch loss. Mismatch loss represents the amount of power wasted in the system. It can also be thought of as the amount of power gained if the system was perfectly matched. Impedance matching is an important part of RF system design; however, in practice there will likely be some degree of mismatch loss.〔Daniels, David J. (2004). Ground penetrating radar (2nd Edition). Institution of Engineering and Technology. ISBN 978-0-86341-360-5〕 In real systems, relatively little loss is due to mismatch loss and is often on the order of 1dB. == Calculation == Mismatch loss (ML) is the ratio of incident power to the difference between incident and reflected power: :$$ ML_\mathrm = 10 \log_ \bigg(\frac\bigg) \, :$$ P_r=P_i - P_d\, where $P\_i$ = incident power $P\_r$ = reflected power $P\_d$ = delivered power (also called the ''accepted power'') The fraction of incident power delivered to the load is :$$ \frac=1-\rho^2 where $\backslash rho$ is the magnitude of the reflection coefficient. Note that as the reflection coefficient approaches zero, power to the load is maximized. If the reflection coefficient is known, mismatch can be calculated by :$$ ML_\mathrm = - 10 \log_ \bigg(1-\rho^2\bigg) \, In terms of the voltage standing wave ratio (VSWR): :$$ ML_\mathrm = - 10 \log_ \bigg(1-\bigg(\frac\bigg)^2\bigg) \, 〔Lo YT and Lee SW 1988 Antenna handbook: Theory, Applications, and Design〕 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「Mismatch loss」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.