Comparison of Fully Distributed and Periodically Loaded Nonlinear Transmission Lines

Author

Duchamp, J.M. ; Ferrari, P. ; Fernandez, M. ; Mélique, X. ; Tao, J.W. ; Arscott, S. ; Lippens, D. ; Jrad, A. ; Harrison, R.G.

Author_Institution

LAHC, Laboratoire d´´HyperfrÃ©quences et de caractÃ©risation, UniversitÃ© de Savoie, 73376 Le Bourget-du-lac Cedex, France. Phone: +33 479 758 751 ; Fax: +33 479 758 742

fYear

2001

fDate

24-26 Sept. 2001

Firstpage

1

Lastpage

4

Abstract

Two different approaches to realizing nonlinear transmission lines (NLTLs) are compared in detail: those using fully-distributed and those employing periodically-loaded nonlinearities. Hetrostructure-barrier varactor measured characteristics are used as the nonlinear elements in the pulse-compression and harmonic-generation (20-60GHz tripler) simulations. We point out that the choice of simulation step size is critical in the case of fully-distributed NLTLs. It must be chosen so that no numerical Bragg cutoff frequency appears. For the frequency tripler, simulations show that with periodically loaded NLTLs, 21% efficiency at 210mW output power and 30% bandwidth can be obtained, whereas only 4.8% efficiency is possible using fully-distributed NLTLs. For pulse compression, the results are comparable but in the fully-distributed case the NLTL cannot be matched and significant reflections occur at the NLTL far end.

Keywords

Bandwidth; Cutoff frequency; Power generation; Power transmission lines; Pulse compression methods; Pulse measurements; Reflection; Transmission line measurements; Transmission lines; Varactors;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Conference, 2001. 31st European

Conference_Location

London, England

Type

conf

DOI

10.1109/EUMA.2001.339001

Filename

4140069