Frequency-adjusted Fresnel lens design for a broadband transducer with varying thickness

S.-Y. ChenJ.-H. LiuPAI-CHI LI2018-09-102018-09-102008-11http://scholars.lib.ntu.edu.tw/handle/123456789/343053[SDGs]SDG7Frequency-adjusted Fresnel lens design for a broadband transducer with varying thicknessconference paper10.1109/ULTSYM.2008.04392-s2.0-67649364208