Four modes waveguide resonator filters

Author

Martin, G. ; Wall, B. ; Kunze, R. ; Weihnacht, M.

Author_Institution

Inst. fur Festkorper- und Werkstofforschung e.V., Dresden

fYear

1993

fDate

31 Oct-3 Nov 1993

Firstpage

35

Abstract

Usually the two slowest modes are used for shaping the passband of waveguide resonator filters. Small waveguide widths and high impedance values are the consequence for filters having a relatively wide passband. Therefore we propose to apply not only the 1st and 2nd but also the 3rd and 4th mode. Calculated and experimental examples for using symmetric (1st and 3rd) or antisymmetric (2nd and 4th) modes alone are presented. Furthermore, a filter involving all four modes is described. Beside the advantage of steep skirts this filter type shows a strong frequency dependence of the group delay. For the calculation of waveguide mode velocities and profiles and of the filter transmission properties a one component bulk wave mode described in a brief manner is used

Keywords

acoustic filters; acoustic resonators; piezoelectric transducers; ultrasonic transducers; filter transmission; four mode waveguide resonator filters; frequency dependence; impedance; one component bulk wave mode; passband; waveguide mode velocities; waveguide widths; Band pass filters; Bandwidth; Frequency dependence; Gratings; Impedance; Passband; Resonator filters; Strips; Surface acoustic waves; Transducers;

fLanguage

English

Publisher

ieee

Conference_Titel

Ultrasonics Symposium, 1993. Proceedings., IEEE 1993

Conference_Location

Baltimore, MD

Print_ISBN

0-7803-2012-3

Type

conf

DOI

10.1109/ULTSYM.1993.339706

Filename

339706