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Transmission Lines

Transmission Lines

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This chapter discusses transmission lines. Transmission lines must be addressed in the study of antennas for three reasons: (1) A transmission line virtually always connects an antenna to a transmitter or receiver, and is often regarded as a part of the antenna system; (2) in some types of antennas transmission-line elements are integral parts of the antenna; and (3) the principles of transmission lines are applicable to understanding some aspects of antenna theory. The material of this chapter, like that of chapter 1, is intended for review and reference. A complete treatise on transmission lines would provide material for an entire book. Therefore only the basic aspects of the subject will be covered here, with emphasis on antenna applications.

Chapter Contents:

  • 2.1 Basic Transmission-Line Concepts
  • 2.1.1 Equivalent-Circuit Line Representation
  • 2.1.2 The Lossless Infinite Line
  • 2.1.3 Reflection and Standing Waves
  • 2.2 Transmission-Line Equations
  • 2.2.1 Steady-State Lossless Line Equations
  • 2.2.2 Some Important Special Line Conditions
  • 2.2.3 Impedance-Admittance Relationships
  • 2.2.4 Reflection Coefficient and VSWR
  • 2.2.5 Standing-Wave Patterns
  • 2.2.6 Determination of Load Impedance by Standing-Wave Measurement
  • 2.2.7 Attenuation
  • 2.3 Impedance Matching and Power Division
  • 2.3.1 The Matching Principle
  • 2.3.2 Stub Transformers
  • 2.3.3 Power Dividers
  • 2.4 Forms of Transmission Lines
  • 2.4.1 Characteristic Impedances
  • 2.5 Waveguides
  • 2.5.1 Phase and Group Velocities
  • 2.5.2 Cutoff Frequency
  • 2.5.3 Rectangular Waveguides
  • 2.5.4 Modes of Propagation
  • 2.5.5 Impedance in Waveguides
  • 2.5.6 Impedance Matching in Waveguides
  • 2.5.7 Transmission-Line-to-Waveguide Coupling
  • 2.5.8 Waveguide Junctions
  • 2.5.9 Other Forms of Waveguide
  • 2.6 Hybrid and Directional Couplers
  • References
  • Problems and Exercises

Inspec keywords: antenna theory; transmitting antennas; receiving antennas; transmission lines

Other keywords: receiver; antennas transmission-line element; antenna system; transmission lines; transmitter; antenna theory

Subjects: Antenna theory; Transmission line theory

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