Title :
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´´Hyperfréquences et de caractérisation, Université de Savoie, 73376 Le Bourget-du-lac Cedex, France. Phone: +33 479 758 751 ; Fax: +33 479 758 742
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;
Conference_Titel :
Microwave Conference, 2001. 31st European
Conference_Location :
London, England
DOI :
10.1109/EUMA.2001.339001
