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本文采用散射参数阐明两个集总参数的二端对网络在连接时不产生附加波动的条件——“连接条件”,即:只须S_(11a)或S_(11b)之一为零。指出了用“匹配”作为集总参数网络的“连接条件”是不十分适当的。提出了在S_(11b)与S_(22a)均不为零时计算附加波动的公式,特别是在|S_(11b)·S_(22a)|<<1时,分别给出了附加工作衰减与附加工作相移的最大波动界限△a_(max)与△b_(max)的表示式(9)与(10)。如果给出了附加波动的界限,就可以用式(1)找出两个反射系数之积|S_(11b)·S_(22a)|的界限。最后用“连接条件”说明了插入衰减器可以压低附加波动的原理,并对压低的程度也作了估算。
In this paper, the scattering parameters are used to illustrate the condition that the two ends of the lumped parameters do not generate any additional fluctuations in the connection, ie the “connection condition”. That is, only one of S_ (11a) or S_ (11b) is zero. It is not appropriate to point out that “match” is the “connection condition” of the lumped parameter network. The formula for calculating the additional fluctuation when S_ (11b) and S_ (22a) are not zero is proposed. Especially when | S 11b (11b) | << 1, the additional work attenuation and Additional working phase shift maximum fluctuation limits △ a_ (max) and △ b_ (max) of the expression (9) and (10). If the boundary of additional fluctuation is given, we can find out the limit of the product | S_ (11b) · S_ (22a) | of the two reflection coefficients by (1). Finally, the “connection conditions” shows the insertion of attenuators can reduce the principle of additional fluctuations, and the degree of depression has also been estimated.