Coupling-matrix-based SAW filter design

Author

Tsung-Chieh Lee ; Guyette, Andrew ; Naglich, Eric J. ; Peroulis, Dimitrios

Author_Institution

Sch. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN, USA

fYear

2014

fDate

1-6 June 2014

Firstpage

1

Lastpage

4

Abstract

This paper presents a design method for resonator-type bandpass SAW filters that results in significantly larger bandwidth than what is currently possible with traditional SAW filter synthesis approaches. Unlike traditional lattice/ladder-type SAW filters, this method employs SAW resonators of a single resonant frequency and therefore reduces the complexity of SAW filter design. The proposed coupling-matrix-based SAW resonator models allow for the realization of a custom frequency response using non-custom SAW resonators. Two different implementations, lumped element (LE) and microstrip line (ML), are demonstrated and achieve 3-dB fractional bandwidths (FBWs) of 0.197% and 0.1% while the electromechanical coupling coefficients, K_t², of the SAW resonators used are 0.132% and 0.049%, respectively.

Keywords

M-theory; band-pass filters; coupled circuits; frequency response; surface acoustic wave resonator filters; LE; ML; SAW resonator model; coupling-matrix; custom frequency response; design complexity; electromechanical coupling coefficient; fractional bandwidth; ladder type; lattice type; lumped element; microstrip line; noncustom SAW resonator; resonator type bandpass SAW filter; single resonant frequency; surface acoustic wave filter synthesis; Educational institutions; Frequency measurement; Microstrip filters; Resonant frequency; Resonator filters; Surface acoustic waves; Transmission line matrix methods; Filters; SAW filter; bandpass filter; surface acoustic wave resonator;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium (IMS), 2014 IEEE MTT-S International

Conference_Location

Tampa, FL

Type

conf

DOI

10.1109/MWSYM.2014.6848568

Filename

6848568