Investigation into the temperature dependence of ferrimagnetic nonlinear transmission lines

J. W.Braxton Bragg, James Dickens, Andreas Neuber

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

In pulsed power systems, coaxial based nonlinear transmission lines (NLTLs) loaded with ferrimagnetic materials act as pulse sharpeners or high power microwave sources. Microwave generation comes by way of nonlinearities present in the ferrimagnetic material as well as excitation of damped gyromagnetic precession at large incident power levels. Ferrimagnetic properties highly depend on operating temperature; therefore, there exists a need to understand operational performance of ferrite loaded NLTLs under different temperature environments. Ferrite samples are chilled or heated to temperatures between ?20 °C to 150 °C, providing a wide range of possible operating temperatures. The Curie temperature of the tested samples is approximately 120 °C; therefore, this study allows observation of precession performance in possible operating temperatures as well as a brief look at the consequences of exceeding the Curie temperature. The design, testing, and results for an NLTL measuring 0.3 m in length with ferrite inner and outer diameters of 3 mm and 6 mm, respectively, are detailed. Results reveal precessional performance, both peak power and frequency of oscillations, versus temperature.

Original languageEnglish
Article number6148287
Pages (from-to)2457-2461
Number of pages5
JournalIEEE Transactions on Plasma Science
Volume40
Issue number10 PART 1
DOIs
StatePublished - 2012

Keywords

  • Ferrimagnetic
  • Nonlinear transmission line (NLTL)
  • gyromagnetic precession

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