Broadband Impedance Matching for High Intensity Focused Ultrasound Transducer
Tan Jianwen1,2,3,Liao Ruijin2,Deng Sijian3,Zeng Deping3
1. Key Lab of Special Power Supply Chongqing Communication Institute Chongqing 400035 China 2. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400030 China 3. Chongqing University of Medical Sciences Chongqing 400016 China
Abstract：In high intensity focused ultrasound(HIFU) therapy system,the impedance matching network should be designed between power supply and ultrasound transducer in order to realize maximum electrical power transmission. Impedance matching network based on passive components can realize exact matching,but the analytical design theory is quite complicated. In this paper,a broadband impedance matching network for the HIFU transducer is designed using simplified real frequency method. The transmission power gain(TPG) is optimized by Levenberg-Marquiardt algorithm to remain as 0.9 smoothly in the frequency band of 200kHz. The acoustic power measurement for HIFU transducer suggests that the broadband impedance matching with TPG optimization can broaden the transducer’s working frequency band effectively.
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2014, Vol. 29 
