This property is true for output impedance if the symmetrical network terminated in Z 0 is driven by a generator with internal impedance equal to Z 0. Thus in general when any symmetrical network is terminated in its characteristic impedance Z 0, the input impedance will also be Z 0. Then the impedance at input terminals of the first network will be still Z 0. That means we can replace this chain by impedance Z 0 at the output port of the first network as shown in the Fig.
8.1 (b), then also the input impedance measured at the input terminals of second network will be Z 0 again as number of networks in the chain are still infinite. If first network is disconnected from the chain as shown in the Fig. Thus the characteristic impedance of a symmetrical network is the impedance measured at the input terminals of the first network in the chain of infinite networks in cascade and it is represented by Z 0. This impedance is the important property of a symmetrical network. The input impedance measured at the input terminals of the first network in the chain of infinite networks will have some finite value which depends on the network composition.
Characteristic Impedance (Z 0):Ĭonsider that infinite number of identical symmetrical networks are connected in cascade or tandem as shown in the Fig. characteristic impedance (Z 0) and propagation constant (γ) are called equivalent networks or identical networks. The two networks having the same electrical properties i.e.
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