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. 2017 Feb 17;7:42863. doi: 10.1038/srep42863

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Copyright © 2017, The Author(s)

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(a,b) The echo pulse of the metamaterial matching layer transducer and the single λ/4 matching layer transducer. The measured and simulated results agreed with each other very well. (c,d) The frequency responses of the transducers on the polystyrene test block. This metamaterial matching layer transducer has a measured −6 dB bandwidth of 107% and simulated bandwidth of 100%. Under the same conditions, the −6 dB bandwidth of the traditional λ/4 matching layer transducer was 58.4% in the experiment and 58.2% in the simulation.