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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 Bartlett's bisection theorem ： ウィキペディア英語版 Bartlett's bisection theorem Bartlett's Bisection Theorem is an electrical theorem in network analysis due to Albert Charles Bartlett. The theorem shows that any symmetrical two-port network can be transformed into a lattice network.〔Bartlett, AC, "An extension of a property of artificial lines", ''Phil. Mag.'', vol 4, p902, November 1927.〕 The theorem often appears in filter theory where the lattice network is sometimes known as a filter X-section following the common filter theory practice of naming sections after alphabetic letters to which they bear a resemblance. The theorem as originally stated by Bartlett required the two halves of the network to be topologically symmetrical. The theorem was later extended by Wilhelm Cauer to apply to all networks which were electrically symmetrical. That is, the physical implementation of the network is not of any relevance. It is only required that its response in both halves are symmetrical.〔Belevitch, V, "Summary of the History of Circuit Theory", ''Proceedings of the IRE'', vol 50, pp850, May, 1962.〕 ==Applications== Lattice topology filters are not very common. The reason for this is that they require more components (especially inductors) than other designs. Ladder topology is much more popular. However, they do have the property of being intrinsically balanced and a balanced version of another topology, such as T-sections, may actually end up using more inductors. One application is for all-pass phase correction filters on balanced telecommunication lines. The theorem also makes an appearance in the design of crystal filters at RF frequencies. Here ladder topologies have some undesirable properties, but a common design strategy is to start from a ladder implementation because of its simplicity. Bartlett's theorem is then used to transform the design to an intermediate stage as a step towards the final implementation (using a transformer to produce an unbalanced version of the lattice topology).〔Vizmuller, P, ''RF Design Guide: Systems, Circuits, and Equations'', pp 82–84, Artech House, 1995 ISBN 0-89006-754-6.〕 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「Bartlett's bisection theorem」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.