Torsional mechanical filters at 500 kHz

Author

Domino, W.J.

Author_Institution

Rockwell Int., Costa Mesa, CA, USA

fYear

1988

fDate

2-5 Oct 1988

Firstpage

245

Abstract

A torsional mechanical filter configuration has been developed for operation in the commonly used IF (intermediate frequency) range of 500 kHz, utilizing third torsional-mode electromechanical transducer resonators in conjunction with second torsional-mode interior resonators. This structure was derived by extension of the lower-frequency (typically 128-kHz) fundamental torsional-mode technology, with methods developed to avoid relatively closely spaced spurious modes in the wire coupling elements. Finally, the observed transition-band skewing has been shown to be caused by coupling-wire weld stiffness in conjunction with the wire´s transverse elasticity, and the configuration of staggered coupling wires has been shown to eliminate this effect

Keywords

electromechanical filters; resonators; transducers; 500 kHz; coupling-wire weld stiffness; interior resonators; intermediate frequency; torsional mechanical filter; torsional-mode electromechanical transducer resonators; transition-band skewing; transverse elasticity; wire coupling elements; Amplitude modulation; Fabrication; Predictive models; Resonance; Resonant frequency; Resonator filters; Space technology; Vibrations; Welding; Wire;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1988. Proceedings., IEEE 1988

Conference_Location

Chicago, IL

Type

conf

DOI

10.1109/ULTSYM.1988.49377

Filename

49377