Evolutionary algorithm for the design of passive electric matching networks for ultrasonic transducers

Ultrasonic transducers are used in various industrial and research applications. Their electric impedance is frequency dependent, especially for mechanically undamped transducers. Moreover, the external conditions, such as varying temperature and different target media, affect the behaviour of the transducer. Therefore, an impedance mismatch occurs between the transducer and the signal source used to excite the transducer. As a means to increase the radiated acoustic power and to broaden the bandwidth of the transducer, matching networks can be used. In this contribution, an approach to design matching networks using global optimisation is developed.