Novel Formulations of the Cauchy Method Suitable for the Synthesis of Microwave Filters and Duplexers

Author

Traina, Daniele ; Macchiarella, Giuseppe

Author_Institution

Dipt. di Elettronica e Informazione, Politecnico di Milano, Milan

fYear

2006

fDate

10-15 Sept. 2006

Firstpage

737

Lastpage

740

Abstract

This paper presents two novel formulations of the Cauchy method: the first one is suitable for microwave filters while the second one can be applied to microwave duplexers. In the filter formulation the characteristic polynomials are generated from the (lossy) measured scattering parameters, allowing the synthesis of a lossless low-pass prototype (and then the evaluation of the coupling matrix of the filter). In the duplexer formulation the modified Cauchy method here proposed produces a reduced-order polynomial model of a lossless duplexer formed by two filters connected at one port through a non-resonant junction. The first method has been verified by employing the measurements of a GSM base station filter; the method for the duplexer has been verified with circuit simulations from a synthesized duplexer

Keywords

S-parameters; low-pass filters; microwave filters; polynomials; reduced order systems; waveguide components; Cauchy method; GSM base station filter; characteristic polynomials; circuit simulations; coupling matrix; lossless duplexer; lossless low-pass prototype filter; microwave duplexers; microwave filters; nonresonant junction; reduced-order polynomial model; scattering parameters; Base stations; Character generation; Circuit simulation; GSM; Loss measurement; Microwave filters; Microwave theory and techniques; Polynomials; Prototypes; Scattering parameters; Bandpass filters; Cauchy Method; Coupling Matrix;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2006. 36th European

Conference_Location

Manchester

Print_ISBN

2-9600551-6-0

Type

conf

DOI

10.1109/EUMC.2006.281007

Filename

4057923