The input impedance of the interdigital saw transducer is measured by the equivalent circuit method . the experimental results show that the synchronized frequency of 9 . 586 mhz , the acoustic radiation resistance of 44 . 6 and the static electrode capacity of 194pf all agree with those design values 用自行設(shè)計(jì)的等效電路測量方案,測量了表面彈性波馬達(dá)換能器的輸入阻抗,實(shí)驗(yàn)結(jié)果顯示表面彈性波換能器的共振頻率為9 . 586mhz ,輻射聲電阻為44 . 6 ,叉指電極靜電容為194pf 。