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Admittance parameters or Y-parameters (the elements of an admittance matrix or Y-matrix) are properties used in electrical engineering, electronic engineering, and communication systems engineering describe the electrical behavior of linear electrical networks. They are also used to describe the small-signal (linearized) response of non-linear networks. They are members of a family of similar parameters used in electronic engineering, other examples being: S-parameters,〔Pozar, David M. (2005); ''Microwave Engineering, Third Edition'' (Intl. Ed.); John Wiley & Sons, Inc.; pp 170-174. ISBN 0-471-44878-8.〕 Z-parameters,〔Pozar, David M. (2005) (op. cit); pp 170-174.〕 H-parameters, T-parameters or ABCD-parameters.〔Pozar, David M. (2005) (op. cit); pp 183-186.〕〔Morton, A. H. (1985); '' Advanced Electrical Engineering'';Pitman Publishing Ltd.; pp 33-72. ISBN 0-273-40172-6〕 ==The Y-parameter matrix== A Y-parameter matrix describes the behaviour of any linear electrical network that can be regarded as a black box with a number of ports. A ''port'' in this context is a pair of electrical terminals carrying equal and opposite currents into and out-of the network, and having a particular voltage between them. The Y-matrix gives no information about the behaviour of the network when the currents at any port are not balanced in this way (should this be possible), nor does it give any information about the voltage between terminals not belonging to the same port. Typically, it is intended that each external connection to the network is between the terminals of just one port, so that these limitations are appropriate. For a generic multi-port network definition, it is assumed that each of the ports is allocated an integer ''n'' ranging from 1 to ''N'', where ''N'' is the total number of ports. For port ''n'', the associated Y-parameter definition is in terms of the port voltage and port current, and respectively. For all ports the currents may be defined in terms of the Y-parameter matrix and the voltages by the following matrix equation: : where Y is an ''N'' × ''N'' matrix the elements of which can be indexed using conventional matrix notation. In general the elements of the Y-parameter matrix are complex numbers and functions of frequency. For a one-port network, the Y-matrix reduces to a single element, being the ordinary admittance measured between the two terminals. 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「Admittance parameters」の詳細全文を読む スポンサード リンク
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