负载R1的吸收功率为: tro Riu RI R (R。+R1)2 欲求p的最大值,应满足dpR1=0, 即邮-R+A)=2(k+A(k=A1M=0 dRI (Ro +RD (R0+R1) d <0 dRI R 8R 求得为极大值条件是:R=R负载RL的吸收功率为： 2 o L 2 2 L oc L (R R ) R u p R i + = = 欲求 p 的最大值，应满足dp/dRL=0， 即   0 ( ) ( ) ( ) ( ) 2( ) d d 3 o L 2 o L o c 4 o L o L L 2 o L 2 o c L = + − = + + − + = R R R R u R R u R R R R R R p 求得p为极大值条件是： RL = Ro 0 8 | d d o 2 oc 2 L 2 L o = = −  R u R p R R