Synthesis and realization of chebyshev filters based on constant electromechanical coupling coefficient acoustic wave resonators
Journal
IEEE MTT-S International Microwave Symposium Digest
Journal Volume
2020-August
Pages
257-260
Date Issued
2020
Author(s)
Abstract
This paper proposes a method to synthesis acoustic wave (AW) filters with Chebyshev response automatically. Meanwhile, each AW resonator used to design the filter can be easily fabricated on the same piezoelectric substrate. The method is based on an optimization algorithm with constraints for constant electromechanical coupling coefficient (kt2) to minimize the defined cost function. Finally, the experimental result for a surface acoustic wave (SAW) filter of global positioning system (GPS) frequency band based on the 42° lithium tantalate (LiTaO3) substrate validates the simulation results. The designed filter shows insertion loss (IL) and return loss (RL) better than 2.5dB and 18dB respectively in the pass-band, and out-band reflection larger than 30dB. © 2020 IEEE.
Subjects
Acoustic wave; Band-pass filters; Microwave communication; Microwave filters; Optimization methods; SAW filters; Surface acoustic waves
SDGs
Other Subjects
Acoustic resonators; Acoustic surface wave filters; Acoustic waves; Cost functions; Electromechanical coupling; Electromechanical devices; Global positioning system; Lithium tantalate; Tantalum compounds; Acoustic wave resonators; Chebyshev response; Electromechanical coupling coefficients; Optimization algorithms; Pass bands; Piezoelectric substrates; Return loss; Surface acoustic waves; Chebyshev filters
Type
conference paper