A multi-IDT input tunable surface acoustic wave filter

Author

Zhu, Jiahua ; Emanetoglu, Nuri W. ; Lu, Yicheng ; Kosinski, John A. ; Pastore, Robert A., Jr.

Author_Institution

Motorola Inc., Piscataway, NJ, USA

Volume

48

Issue

5

fYear

2001

Firstpage

1383

Lastpage

1388

Abstract

Tunable surface acoustic wave (SAW) filters (TSF) have been widely used in the wireless telecommunication systems. A prototype of multi-IDT (interdigital transducer) input TSF has been developed. The device consists of 11 IDTs paralleled in the SAW propagation path. Different SAW filter configurations are realized by selecting or combining various IDTs, resulting in the tunability of both center frequency and 3 dB bandwidth. The center frequencies of the SAW filter range from 126.8 to 199.1 MHz; the 3 dB bandwidths range from 15.2 to 58.9 MHz. Impedance weighting methods have been applied. The passband ripple has been reduced from 6.44 to 1.37 dB after resistance weighting.

Keywords

UHF filters; band-pass filters; circuit tuning; interdigital transducers; surface acoustic wave filters; 126.8 to 199.1 MHz; 15.2 to 58.9 MHz; 3 dB bandwidth; SAW propagation path; center frequency; impedance weighting methods; multi-IDT design; passband ripple; resistance weighting; tunable surface acoustic wave filter; wireless telecommunication systems; Acoustic propagation; Acoustic transducers; Acoustic waves; Bandwidth; Frequency; Impedance; Prototypes; SAW filters; Surface acoustic wave devices; Surface acoustic waves;

fLanguage

English

Journal_Title

Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on

Publisher

ieee

ISSN

0885-3010

Type

jour

DOI

10.1109/58.949747

Filename

949747