Abstract:Miniaturization of electro-mechanical sensors and actuators has benefited from an advancement in CMOS technology over the years. However, miniaturization of audio speakers has seen considerable development only in the recent times. This paper reviews the developments in MEMS audio speaker research and the initial commercial products available in the market. At first glance, it appears that the relatively slow development of MEMS speakers can be attributed to the fact that the principle of actuation has remaine… Show more
“…Engineers and researchers continually strive to improve isolation in MEMS switches to meet the increasingly stringent requirements of modern communication systems. This involves a multidisciplinary approach that combines expertise in MEMS design, materials science, and RF engineering [60,61]. As MEMS technology advances, achieving higher levels of isolation becomes a key factor in ensuring the reliability and performance of MEMS switches in diverse applications.…”
Micro-Electro-Mechanical System (MEMS) switches have emerged as pivotal components in the realm of miniature electronic devices, promising unprecedented advancements in size, power consumption, and versatility. This literature review paper meticulously examines the key issues and challenges encountered in the development and application of MEMS switches. The comprehensive survey encompasses critical aspects such as material selection, fabrication intricacies, performance metrics including switching time and reliability, and the impact of these switches on diverse technological domains. The review critically analyzes the influence of design parameters, actuation mechanisms, and material properties on the performance of MEMS switches. Additionally, it explores recent advancements, breakthroughs, and innovative solutions proposed by researchers to address these challenges. The synthesis of the existing literature not only elucidates the current state of MEMS switch technology but also paves the way for future research avenues. The findings presented herein serve as a valuable resource for researchers, engineers, and technologists engaged in advancing MEMS switch technology, offering insights into the current landscape and guiding future endeavors in this rapidly evolving field.
“…Engineers and researchers continually strive to improve isolation in MEMS switches to meet the increasingly stringent requirements of modern communication systems. This involves a multidisciplinary approach that combines expertise in MEMS design, materials science, and RF engineering [60,61]. As MEMS technology advances, achieving higher levels of isolation becomes a key factor in ensuring the reliability and performance of MEMS switches in diverse applications.…”
Micro-Electro-Mechanical System (MEMS) switches have emerged as pivotal components in the realm of miniature electronic devices, promising unprecedented advancements in size, power consumption, and versatility. This literature review paper meticulously examines the key issues and challenges encountered in the development and application of MEMS switches. The comprehensive survey encompasses critical aspects such as material selection, fabrication intricacies, performance metrics including switching time and reliability, and the impact of these switches on diverse technological domains. The review critically analyzes the influence of design parameters, actuation mechanisms, and material properties on the performance of MEMS switches. Additionally, it explores recent advancements, breakthroughs, and innovative solutions proposed by researchers to address these challenges. The synthesis of the existing literature not only elucidates the current state of MEMS switch technology but also paves the way for future research avenues. The findings presented herein serve as a valuable resource for researchers, engineers, and technologists engaged in advancing MEMS switch technology, offering insights into the current landscape and guiding future endeavors in this rapidly evolving field.
“…[1][2][3] Especially, Pb(Zr, Ti)O 3 (PZT) is one of the most commonly used materials for piezoelectric MEMS with actuator components thanks to its large piezoelectricity. For example, many applications have been created, such as micro speakers, 4,5) inkjet printer heads, 6) piezoelectric micromachined ultrasonic transducers (pMUT), [7][8][9] micromirrors 10,11) and gyroscopes. 12,13) Basically, polycrystalline (Poly) PZT thin films are deposited on Si substrates and patterned for the fabrication of the devices.…”
This paper presents a novel form of Pb(Zr,Ti)O3 (PZT) thin film with a structure in which monocrystalline (Mono) PZT is sectioned with narrow mesh-like polycrystalline (Poly) PZT. The motivation is to overcome the inherent brittleness of piezoelectric Mono thin films. The design assumes that the Poly pattern will stop crack propagation within the Mono area. As a proof of concept, a Mono-Poly PZT composite thin film with a 20-µm-pitch and 2-µm-wide Poly pattern was sputter-deposited on a patterned underlayer on a Si substrate. Its piezoelectric properties were close to those of pure Mono PZT thin films, while its dielectric constant was significantly lower than those of pure Poly PZT thin films. Indentation tests confirmed the Poly patterns effectively stops crack propagation, which is likely to improve the mechanical durability of the overall film.
The investigated parametrically coupled electromechanical structure is composed of a mechanical Duffing oscillator whose mass sits on a moving belt surface. The driving electrical network is a van der Pol oscillator whose aim is to actuate the attached DC motor to provide some rotatry unbalances and parametric coupling in the vibrating structure. The coupled oscillator is applied to energy harvesting and overcomes the limitation of low energy generation associated with a single oscillator of this kind. The system was solved analytically and validated by numerical methods. The global dynamics of the structure were investigated, and nonlinear phenomena such as Neimark–Sacker bifurcation, discontinuity-induced bifurcation, grazing–sliding, and bifurcation to multiple tori were identified. These nonlinear behaviors affect the harvested energy at bifurcation points, resulting in jumps from one energy level to another. In addition to harnessing the highest energy under hard parametric coupling, the coupling ensures that higher and more useful energy is harvested over a wider range of belt speeds. Finally, the qualitative validation of the numerical concept by experimental setup verifies the workings of the model.
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