具有不同机械阻抗匹配器，为换能器提供了双调谐的特性。
The different mechanical impedance of matching means provide the double-tuned resonance characteristic to the transducers.
数值计算结果表明，用修正公式设计的阻抗匹配器，在2<40范围内，驻波比全都小于1.08。
The standing-wave ratio in line all is smaller than 1.08, for 2<40.
数值计算结果表明，用修正公式设计的阻抗匹配器，在2<40范围内，驻波比全都小于1.08。
The standing-wave ratio in line all is smaller than 1.08, for 2<40.
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