Title :
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
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;
Conference_Titel :
Microwave Symposium Digest, 1997., IEEE MTT-S International
Conference_Location :
Denver, CO, USA
Print_ISBN :
0-7803-3814-6
DOI :
10.1109/MWSYM.1997.602873
