网孔电流法 R R R R R,+ R 111 m21112 + R,,=L m3413 S11 imiR2utimr R2r+im3R23=us2 imMIr31+im2 R32+im3R33=us S33 5:45:351 3 1 2 3 2 3 3 3 3 3 1 2 1 2 2 2 3 2 3 2 2 1 1 1 2 1 2 3 1 3 1 1 m m m S m m m S m m m S i R i R i R u i R i R i R u i R i R i R u + + = + + = + + = 网孔电流法