Design of IF two-track filters using IDT/(100) AlN/diamond structure

Author

Ro, Ruyen ; Lee, Ruyue ; Sung, Chia-Chi ; Chiang, Yuan-Feng ; Wu, Sean

Author_Institution

Dept. of Electr. Eng., I-Shou Univ., Kaohsiung, Taiwan

fYear

2009

fDate

20-24 April 2009

Firstpage

931

Lastpage

934

Abstract

Propagation characteristics of surface acoustic waves (SAWs) in IDT/(100) AlN/diamond structures are analyzed in this study using the finite element method (FEM). The extracted coupling-of-mode (COM) parameters are employed to calculate the frequency responses of two-track SAW filters using the transmission matrix method. To enhance the sideband suppression, Chebyshev function is adopted to modify the reflectivity distributions of reflectors, which can be realized using width-modulated reflectors. The copper electrode is used to retain a sufficiently high reflectivity. Simulation results show that a two-track SAW filter applicable for the CDMA system can be tailored using IDT/(100) AlN/diamond structures.

Keywords

acoustic wave propagation; frequency response; surface acoustic wave filters; surface acoustic waves; Chebyshev function; IF two-track filter design; copper electrode; coupling-of-mode parameters; finite element method; frequency response; propagation characteristics; reflectivity distribution; sideband suppression; surface acoustic waves; transmission matrix method; two-track SAW filter; width-modulated reflector; Acoustic propagation; Acoustic waves; Chebyshev approximation; Couplings; Finite element methods; Frequency; Reflectivity; SAW filters; Sawing machines; Surface acoustic waves; AlN; diamond; filter; finite element method; surface acoustic wave;

fLanguage

English

Publisher

ieee

Conference_Titel

Frequency Control Symposium, 2009 Joint with the 22nd European Frequency and Time forum. IEEE International

Conference_Location

Besancon

ISSN

1075-6787

Print_ISBN

978-1-4244-3511-1

Electronic_ISBN

1075-6787

Type

conf

DOI

10.1109/FREQ.2009.5168325

Filename

5168325