Highly Tunable Narrow Bandpass MEMS Filter

Md Abdullah Al Hafiz, Lakshmoji Kosuru, Amal Hajjaj, Mohammad I. Younis

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

We demonstrate a proof-of-concept highly tunable narrow bandpass filter based on electrothermally and electrostatically actuated microelectromechanical-system (MEMS) resonators. The device consists of two mechanically uncoupled clamped-clamped arch resonators, designed such that their resonance frequencies are independently tuned to obtain the desired narrow passband. Through the electrothermal and electrostatic actuation, the stiffness of the structures is highly tunable. We experimentally demonstrate significant percentage tuning (~125%) of the filter center frequency by varying the applied electrothermal voltages to the resonating structures, while maintaining a narrow passband of 550 ± 50 Hz, a stopband rejection of >17 dB, and a passband ripple ≤ 2.5 dB. An analytical model based on the Euler-Bernoulli beam theory is used to confirm the behavior of the filter, and the origin of the high tunability using electrothermal actuation is discussed.
Original languageEnglish (US)
Pages (from-to)3392-3398
Number of pages7
JournalIEEE Transactions on Electron Devices
Volume64
Issue number8
DOIs
StatePublished - Jul 7 2017

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