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Analysis of Multiconductor Transmission Lines, 2nd Edition by Clayton R. Paul

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13

TRANSMISSION-LINE NETWORKS

The previous chapters of this book have considered the analysis of uniform transmission lines that have one important restriction: All n + 1 conductors are parallel to each other. Numerous practical configurations consist of interconnections of these types of lines as illustrated in Figure 13.1(a). These practical configurations will be referred to as transmission-line networks. Lines may end in termination networks or may be interconnected by interconnection networks. Each transmission line of the network will be referred to as a tube after [13]. A convenient way of describing the overall network is with a graph as illustrated in Figure 13.1(b) [1,2,4]. The transmission lines are represented with single lines or branches of the graph. The termination networks are defined as a node having only one tube incident on it and are represented by rectangles. The interconnection networks are defined as a node having more than one tube incident on it and are represented by circles. The excitation for the network may be in the form of lumped sources in the termination or interconnection networks or it may be due to either distributed excitation from an incident electromagnetic field or a point excitation along the line as with the direct attachment of a lightning stroke. Point excitation of a tube as in the case of a direct attachment of a lightning stroke can be handled by characterizing the segments of the tube to the left and right of the excitation point ...

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