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Transmission lines and microwave circuits

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Part of the Microwave Technology Series book series (MRFT,volume 10)


A transmission line is called uniform when its parameters do not vary in the direction of propagation. If we assign the z coordinate to the propagation direction then the propagation of a sinusoidal wave can be described by a function exp(jωt — γz) which is common to all field components. The constant y is called the propagation exponent and is in general a complex quantity. Its real part (α) is called the damping coefficient and its imaginary part (k) the propagation coefficient or wave number. For lossless lines the t-z dependence simplifies to exp[j (ωtkz)]. Another important quantity that characterizes a transmission line is the characteristic impedance Zo, in principle also a complex quantity.


  • Reflection Coefficient
  • Transmission Line
  • Directional Coupler
  • Characteristic Impedance
  • Rectangular Waveguide

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  1. Getsinger, W. J. (1966) The packaged and mounted diode as a microwave circuit. IEEE Trans. Microwave Theory Tech., 14, 58–69.

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  2. Edwards, T. C. (1981) Foundations for Microstrip Circuit Design, Wiley, Chichester, New York.

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  3. Gupta, K. C, Garg, R. and Chadha, R. (1981), Computer-Aided Design of Microwave Circuits, Artech House, Dedham, MA.

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Further Reading

  1. Benson, F. A. and Benson, T. M. (1991) Fields, Waves and Transmission Lines Chapman& Hall, London.

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  2. Pozar, D. M. (1990) Microwave Engineering, Addison-Wesley, Reading, MA.

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  3. Liao, S. (1987) Microwave Circuit Analysis and Amplifier Design, Prentice-Hall International, Englewood Cliffs, NJ.

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  4. Laverghetta, T. S. (1988) Modem Microwave Measurements and Techniques, Artech, Norwood, MA.

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  5. Kurokawa, K. (1969) An Introduction to the Theory of Microwave Circuits, Academic Press, New York.

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  6. Matthaei, G. Young, L. and Jones M. E. T. (1980) Microwave Filters, Impedance Matching Networks and Coupling Structures, Artech, Dedham, MA.

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© 1994 Springer Science+Business Media Dordrecht

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van de Roer, T.G. (1994). Transmission lines and microwave circuits. In: Microwave Electronic Devices. Microwave Technology Series, vol 10. Springer, Boston, MA.

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  • Publisher Name: Springer, Boston, MA

  • Print ISBN: 978-0-412-48200-7

  • Online ISBN: 978-1-4615-2500-4

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