RF Acoustic for Mobile Communication: Challenges and Modern Solutions [From the Guest Editors' Desk]

Nonlinear Effects of SiO2 Layers in Bulk Acoustic Wave Resonators

“…ULK acoustic wave (BAW) technology is becoming the main solution for the complex RF filtering of current and future mobile devices [1]. The increasing amount of services, frequency band and worldwide interoperability requirements for the handsets force the industry to place more and more high performance filters in a reduced space.…”

Advanced technologies for next‐generation RF front‐end modules

“…Figure depicts the frequency dependent dielectric constant and loss tangent of multilayer LiTaO 3 films annealed at 650°C. The dielectric constant and loss tangent of LiTaO 3 are reported to be 43 to 47 and lower than 0.01 in previous studies . However, Reference shows that in case of thin films, the dielectric constant and loss tangent are strongly influenced by the growth conditions, orientation, nature of electrodes used and interfaces between these films.…”

“…Acoustic wave substrates are widely adopted to design RF filters and sensors. In addition to their small size, acoustic wave devices offer high‐quality factors that result in low insertion losses (a smaller insertion loss leads to a longer battery life and a better signal‐to‐noise ratio) as well as steep filter flanks (steeper filter flanks allow more efficient use of the frequency spectrum) . A recent report from Yole Developpment predicts the RF filters will grow up to a US $17 billion market over the next 5 years .…”

The Input–Output Equivalent Sources Method for Fast Simulations of Distributed Nonlinearities in Bulk Acoustic Wave Resonators and Filters

“…Electroacoustic technology has become the main driving technology for the development of nowadays portable communication devices, with very complex multisystem RF stages comprising many stringent filtering components sharing a single antenna [5]. Despite this technology is by far the best current solution to locate many high-performance filters in a very reduced area, it suffers from intrinsic nonlinearities that may set limits to the performance of the receivers.…”