Enhancing Q-factor using fractal electrodes in Film Bulk Acoustic Resonator for wireless applications

Bhadauria, Avanish; Panchal, Bhargav; Varghese, Soney

doi:10.1109/apmc.2016.7931314

Cited by 2 publications

(1 citation statement)

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“…Conventionally the planar geometry of electrodes is used. The use of fractal geometry in the top electrode of the FBAR improves the quality factor, as previously shown [27]. The FBAR converts the applied electrical energy into mechanical energy.…”

Section: Methodsmentioning

confidence: 60%

3D FEM Simulation and Analysis of Fractal Electrode-Based FBAR Resonator for Tetrachloroethene (PCE) Gas Detection

Panchal

Varghese

2022

Fractal Fract

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This paper presents the FEM modeling and simulation of a thin-film bulk acoustic resonator (FBAR) for a tetrachloroethene (PCE) gas-sensing application. A zinc oxide layer is used as a piezoelectric material; an aluminum layer is used as the electrode material in the structure of the FBAR. Polyisobutylene (PIB) is used as the sensitive layer for PCE gas detection. The study was carried out in commercially available FEM-based COMSOL software. The proposed structure was exposed to six different organic gases with concentrations ranging from 0 to 1000 ppm. The structure showed high selectivity for PCE gas. Incorporating the 3rd-order Hilbert fractal geometry in the top electrode of the FBAR increased the sensitivity of the sensor which showed high selectivity for PCE gas detection. A sensitivity enhancement of 66% was obtained using fractal geometry on the top electrode of the FBAR without alteration in size or cost. In addition, a reduction in the cross-sensitivity was achieved. Further, the PIB layer thickness and active area of the FBAR were optimized to obtain high sensitivity. The equivalent circuit was also analyzed to understand the behavior of the sensing effect and mechanism.

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Section: Methodsmentioning

confidence: 60%