Golden Age for Filter Design: Innovative and Proven Approaches for Acoustic Filter, Duplexer, and Multiplexer Design

Mobile communication is already an integral part of our lives, and its role will only continue to grow. While early mobile phone functions were limited mainly to simple address books and text messaging, today´s predominant smartphones and tablets support almost endless functionality via third-party application software, bringing an insatiable hunger for higher download rates. Telecommunication associations all around the world [1] are, therefore, continuously working on new cellular network technologies. This comes along with the introduction of advanced digital modulation schemes with higher spectral efficiency; multiple-input, multiple-output (MIMO)-based radio interfaces; and carrier aggregation (CA) [2].