Simulation modeling and correction method for balance performance of RF SAW filters

Author

Koshino, M. ; Kanasaki, H. ; Yamashita, T. ; Mitobe, S. ; Kawase, M. ; Kuroda, Y. ; Ebata, Y.

Author_Institution

Fujitsu Media Devices Ltd., Kanagawa, Japan

Volume

1

fYear

2002

fDate

8-11 Oct. 2002

Firstpage

301

Abstract

In mobile phone RF stages, the balanced SAW filter has assumed an important role. In order to suppress signal distortion, amplitude and phase imbalance are required to be reduced. This paper describes a new simulation modeling of balance performance. The developed 8-port F-matrices model includes the effect of coupling capacitances and the end effect of excitation intensity of SAW using a modified Smith´s equivalent circuit model. The simulation results show good agreement with measured results for 3IDT type DMS filters. Moreover, a correction design using an optimization program with the developed simulator engine has been carried out, and less than half level imbalance characteristics have been successfully obtained for 5IDT type DCS-RX filters.

Keywords

interdigital transducers; radiofrequency filters; surface acoustic wave filters; 5IDT type DCS-RX filter; 8-port F-matrices model; DMS filter; Smith´s equivalent circuit model; balanced RF SAW filters; coupling capacitances; excitation intensity; mobile phone RF stage; optimization program; simulation modeling; Capacitance; Circuit simulation; Coupling circuits; Design optimization; Equivalent circuits; Mobile handsets; Phase distortion; Radio frequency; SAW filters; Surface acoustic waves;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 2002. Proceedings. 2002 IEEE

ISSN

1051-0117

Print_ISBN

0-7803-7582-3

Type

conf

DOI

10.1109/ULTSYM.2002.1193407

Filename

1193407