In fact, a four - wire circuit can be established without the use of any wires at all, as in the case with a circuit established over microwave, satellite, or infrared transmission systems.
事实上，可以不使用任何线来建立四线电路，例如通过微波、卫星或红外传输系统。
In the view of the difficult problem on oversea transmission by microwave, some researches on circuit design are presented in this paper.
该文主要对在设计电路时，考虑微波在海面传输中存在的问题和克服的方法，作一些回顾。
In this paper, basic transmission line equation and four kinds of lumped-circuit model were constructed according to transmission line theory, microwave network, antenna theory and matrix theory.
本文依据传输线理论、微波网络理论、天线原理、矩量法和矩阵理论等，建立起基本传输线方程和四种等效电路模型，为使用集总电路迭代近似方法建立了基础。
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