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Physics LibreTexts

7: TEM Transmission Lines

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Transmission lines typically convey electrical signals and power from point to point along arbitrary paths with high efficiency, and can also serve as circuit elements. In most transmission lines, the electric and magnetic fields point purely transverse to the direction of propagation; such waves are called transverse electromagnetic or TEM waves, and such transmission lines are called TEM lines. The basic character of TEM waves is discussed in Section 7.1, the effects of junctions are introduced in Section 7.2, and the uses and analysis of TEM lines with junctions are treated in Section 7.3. Section 7.4 concludes by discussing TEM lines that are terminated at both ends so as to form resonators.

  • 7.1: TEM Waves on Structures
    This page explores the behavior and properties of transverse electromagnetic (TEM) transmission lines, focusing on their characteristic impedance, coupling of electric and magnetic fields, and wave propagation. It discusses equations for voltage and current derived from inductance and capacitance, emphasizing lossless conditions and the effects of geometry on performance.
  • 7.2: TEM Lines with Junctions
    This page covers boundary value problems in transmission lines, emphasizing the uniqueness theorem and steps to resolve these issues through wave behavior and boundary conditions. It explains lossless TEM transmission lines and their wave equations, introduces reflection and transmission coefficients, and examines the behavior of standing waves and load impedance.
  • 7.3: Methods for Matching Transmission Lines
    This page discusses frequency-dependent behavior in transmission lines and ways to minimize reflections through tuning strategies, including the use of obstacles and reactive components. It explores the relationship between reflection coefficients and normalized impedances, emphasizing the Smith chart for analyzing and achieving impedance matching.
  • 7.4: TEM Resonances
    This page explores the characteristics and applications of resonators, focusing on their energy storage, filtering capabilities, and quality factor (Q). It discusses the dynamics of transmission line resonators, their resonant frequencies, and the relationship between electric and magnetic energy. Key topics include the orthogonality of resonance modes, the impact of reactive impedances, and performance influenced by resistive elements.


This page titled 7: TEM Transmission Lines is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by David H. Staelin (MIT OpenCourseWare) via source content that was edited to the style and standards of the LibreTexts platform.

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