Frequency tuning in electromagnetic bandgap nonlinear transmission lines

Author

Martín, E. ; Carreras, J.L. ; Bonache, J. ; Falcone, F. ; Lopetegi, T. ; Laso, M.A.G. ; Sorolla, M.

Author_Institution

Departament d´´Enginyeria Electronica, Univ. Autonoma de Barcelona, Spain

Volume

39

Issue

5

fYear

2003

fDate

3/6/2003 12:00:00 AM

Firstpage

440

Lastpage

442

Abstract

Frequency tuning in stopband filters based on nonlinear transmission lines is demonstrated for the first time. The structure is an electromagnetic bandgap (EBG) coplanar waveguide reflector periodically loaded with varactor diodes, acting as tuning elements. By varying the capacitance of the diodes the phase velocity can be tailored, the result being a wide tuning range for the central frequency of the rejected band. It was also found that the EBG-based reflector is able to inhibit harmonic generation under large-signal driving conditions.

Keywords

UHF filters; band-stop filters; capacitance; coplanar waveguide components; coplanar waveguides; high-frequency transmission lines; passive filters; periodic structures; tuning; varactors; waveguide filters; CPW technology; EBG coplanar waveguide reflector; EM bandgap CPW reflector; capacitance variation; capacitive coupling; electromagnetic bandgap; frequency tuning; harmonic generation inhibition; large-signal driving conditions; nonlinear transmission lines; periodically loaded transmission lines; reflection properties; slow wave effects; stepped impedance EBG NLTL; tailored phase velocity; tunable stopband filters; varactor diodes; varactor tuning elements; wide tuning range;

fLanguage

English

Journal_Title

Electronics Letters

Publisher

iet

ISSN

0013-5194

Type

jour

DOI

10.1049/el:20030307

Filename

1190001