A new design of microwave filters by using continuously varying transmission lines

Author

Le Roy, M. ; Perennec, A. ; Toutain, S. ; Calvez, L.C.

Author_Institution

Lab. d´Electron. et Syst. de Telecommun., Brest, France

Volume

2

fYear

1997

fDate

8-13 June 1997

Firstpage

639

Abstract

This paper outlines a new original method for microwave filter design. A cubic spline interpolation is used to design a filter with a continuously changing profile. Then, the scattering parameters of a non-uniform transmission line with a cubic polynomial variation of its characteristic impedance are studied in detail in the frequency domain. In order to validate this method, a wideband bandstop filter consisting in a non-uniform microstrip line with continuously varying width was optimized, designed, constructed and measured.

Keywords

S-parameters; band-stop filters; interpolation; microstrip filters; microwave filters; passive filters; splines (mathematics); transmission line theory; characteristic impedance; continuously varying transmission lines; continuously varying width; cubic polynomial variation; cubic spline interpolation; filter design; microwave filters; nonuniform microstrip line; nonuniform transmission line; scattering parameters; wideband bandstop filter; Frequency domain analysis; Impedance; Interpolation; Microstrip filters; Microwave filters; Microwave theory and techniques; Polynomials; Scattering parameters; Spline; Wideband;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 1997., IEEE MTT-S International

Conference_Location

Denver, CO, USA

ISSN

0149-645X

Print_ISBN

0-7803-3814-6

Type

conf

DOI

10.1109/MWSYM.1997.602873

Filename

602873