Scattering matrix approach to STW resonators

Author

Soluch, Waldemar

Author_Institution

Inst. of Electron. Mater. Technol., Warsaw, Poland

Volume

49

Issue

3

fYear

2002

fDate

3/1/2002 12:00:00 AM

Firstpage

327

Lastpage

330

Abstract

The scattering matrix method was used for the analysis of surface transverse wave (STW) resonators on quartz. An expression for the transfer function of the resonators with different numbers of electrodes in the reflectors was derived. It was found that, for a proper ratio of these numbers, the spurious signal level below the resonance frequency can be lowered. The STW resonator for the frequency near 1090 MHz was designed, fabricated, and measured. By matching the measured and calculated transfer functions, the velocity, the electromechanical coupling coefficient, and the reflection coefficient of one aluminium strip of the STW on the 36/spl deg/Y-cut quartz were determined. The insertion loss about 7 dB, loaded quality coefficient near 4200, and the spurious signal level about 5 dB lower compared with the resonance one were obtained for the resonator.

Keywords

Q-factor; S-matrix theory; surface acoustic wave resonators; transfer functions; 1090 MHz; 7 dB; Al; SiO/sub 2/; aluminium strip; electromechanical coupling coefficient; insertion loss; quality coefficient; quartz; reflection coefficient; scattering matrix; spurious signal level; surface transverse wave resonator; transfer function; velocity; Aluminum; Electrodes; Frequency measurement; Reflection; Resonance; Resonant frequency; Scattering; Surface waves; Transfer functions; Velocity measurement; Acoustics; Algorithms; Computer Simulation; Equipment Design; Microwaves; Models, Theoretical; Quartz; Sensitivity and Specificity; Transducers;

fLanguage

English

Journal_Title

Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on

Publisher

ieee

ISSN

0885-3010

Type

jour

DOI

10.1109/58.990946

Filename

990946