3端口1电源有内阻,端口2接负载 (S) 已知Z参数求 R U2(S) US(S) U(SN RUIS)H(S) Us(S) ∫U1(S)=2zn(S)H1(S)+Z12(S)12S) 1U2(s)=z2(S)(S)+Z2(S)l2(S) U1(S)=Us(S)-R11(S) U2(S)=-12(S)R H(S)=2(S) Z2ISR Us(S)(R1+21(S)(R+22(S)-2n(S)21(S) 二端口的转移函数不仅和二端口参数有关而且和端接阻抗有关3 端口1电源有内阻，端口2接负载 US (S) U1(S) N U2(S) I1(S) I2(S) R + - R1 已知Z参数求 ( ) ( ) ( ) 2 U S U S H S S  ( ) ( ) ( ) 2 U S U S H S S         ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) ( ) 2 21 1 22 2 1 11 1 12 2 U S Z S I S Z S I S U S Z S I S Z S I S ( ) ( ) ( ) U1 S  US S  R1 I1 S U2 (S)  I 2 (S)R ( ( ))( ( )) ( ) ( ) ( ) 1 11 22 12 21 21 R Z S R Z S Z S Z S Z S R     二端口的转移函数不仅和二端口参数有关而且和端接阻抗有关