The simulation result was validated by comparing it to the FBAR test results. Then, a 3.7 GHz FBAR was fabricated through MEMS technology based on the optimized structural parameters. first analyzed the harmonic characteristics of the FBAR and proposed the optimized structure of the FBAR by using the FEM method. Traditional radio frequency filters cannot meet the demands of miniaturization, high frequency operation, integration, and broadband capacity in new-generation communication systems owing to their larger volumes. Compared with the LN/Si structure, the BCB layer in the POS substrate could concentrate more SAW vibration in the piezoelectric thin film layer. explored the detailed fabrication process of a piezoelectric-on-silicon (POS) substrate, by using Smart-Cut technology, a 128°Y-X LN POS substrate with a high-quality single-crystal LN film and low surface roughness was fabricated. The surface acoustic wave (SAW) is an ultrasonic device which provides a wide range of applications with the use of an electronic system, including delay lines, filters, correlators, and DC to DC converters. The proposed transfer matrix method is an effective method to simulate the dynamic performance of the ultrasonic welding electrode system, and provides a better basis for further optimization. The vibration velocity ratio, resonance frequency, and amplitude ratio of the two models were compared. presented the finite element model and the transfer matrix model for the sonotrode system. The model of the sonotrode system was established to simulate the performance of two ultrasonic transducers and one sonotrode. The results showed that in some applications, such as IVUS, the influence of the cable was not negligible, and even for high frequency transducers, different cable lengths had a significant effect on the transducer. described the design and fabrication of ultrasonic transducers with different frequencies (12 and 20 MHz), different matching layers, and different cable lengths (0.5–2.5 m) to validate the effectiveness of the Leach model and the transmission line model. In addition, the authors also shared some views on the future development of UHF ultrasonic transducers. introduced an ultrahigh frequency (UHF) ultrasonic transducer, and summarized the current research status from three aspects: material selection, focus design, and acoustic energy transmission matching. Devices Fabrication, Structures, and Applications The phased array was fabricated based on 1-3 piezoelectric composites with a flexible circuit, and exhibited a high spatial resolution and imaging performance. proposed a 64-element ultrasonic phased-array transducer with a central frequency of 9 MHz for intracardiac echocardiography. Furthermore, the ceramics are suitable for further applications even under high temperatures.Ĭomposite materials combine the advantages of piezoelectric materials and polymers to achieve high electromechanical coupling coefficients and low acoustic impedance. These results showed that Sm 3+ modification can improve the properties of KNLN-BZ-BNT ceramics. When the temperature was raised from 30 to 180☌, the thermal stability of the d 33 value decreased to less than 20%. reported the effect of Sm 3+ modification for novel lead-free KNLN-BZ-BNT ceramics. On this basis, the current research status and application prospects of those piezoelectric materials were summarized systematically, which can be used as the experimental design of piezoelectric materials to provide a level of theoretical reference.Ĭonventional lead-based piezoelectric materials for ultrasonic transducers are harmful to the human body and the environment. described rate-earth elements-doped piezoelectric materials that were categorized into ceramics, single crystals, and thin films. Piezoelectric materials have wide applications in energy conversion, sensors, drives, and frequency control. This Research Topic of new piezoelectric materials and devices presents two reviews and eight original research articles that give insight into new piezoelectric materials, provide a basis for equivalent models of piezoelectric devices, and summarize and prospect the research of piezoelectric devices. Typical piezoelectric materials include bulk ceramics, thin films, single crystals, polymers, composites, etc., which are used for a variety of devices such as ultrasound transducers, sensors, and actuators. Piezoelectric materials and devices are fundamental to industrial and scientific applications such as non-destructive testing, acoustic tweezers, medical imaging, and ultrasound therapy.
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