Synthesis and performance of medium bandwidth, low time-spurious, high out-of-band rejection SPUDT filters

Author

Shen Jen ; Hartmann, C.S.

Author_Institution

Hartmann Res. Inc., Dallas, TX

fYear

1993

fDate

31 Oct-3 Nov 1993

Firstpage

9

Abstract

This paper discusses the synthesis and performance of a family of medium (5 to 8%) fractional bandwidth SPUDT filters for a miniature UHF SAW channelizer. These filters employ chirped input and output transducers to overcome the otherwise limited electrode reflectivity needed for the required fractional bandwidth. They are designed to achieve moderate insertion loss, low time-domain spurious, and high out-of-band rejection without the need of electrical matching. A modified electrode-width controlled (EWC) scheme is devised to implement the desired transduction and reflection weightings

Keywords

surface acoustic wave devices; chirped input transducers; chirped output transducers; electrode reflectivity; fractional bandwidth SPUDT filters; medium bandwidth low time-spurious high out-of-band rejection SPUDT filters; miniature UHF SAW channelizer; moderate insertion loss; modified electrode-width controlled scheme; reflection weightings; Bandwidth; Chirp; Electrodes; Filters; Insertion loss; Reflection; Reflectivity; Surface acoustic waves; Time domain analysis; 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.1993.339710

Filename

339710