Antennas and signal theory

  • Claude Shannon
Part of the Microwave and RF Technology Series book series (MRFT, volume 12)


The subject of signal theory was developed particularly after the Second World War [Shannon, Wiener]; developments in telecommunication and radar opened numerous fields of applications. Using this theory, the ability of a system to transmit information may be quantitatively evaluated. About the same time, optical engineers had the idea of treating an optical image as a 2-D spatial message and to evaluate the quantity of information that it contained. In 1947, Duffieux1 developed on a theoretical and experimental basis the harmonic analysis of images; optical instruments could be evaluated by their ability to reproduce periodic test patterns of shorter and shorter spatial periods, that is to say, of higher and higher spatial frequency, until a cut-off frequency is reached beyond which the image is no longer reproduced.


Spatial Frequency Radiation Pattern Signal Theory Main Lobe Visible Domain 
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Further Reading

  1. 1.
    Hansen, R.C., ‘Array pattern control and synthesis’, Proc. IEEE, Vol. 80, No. 1, pp 141–151, January 1992.CrossRefGoogle Scholar
  2. 2.
    Milne, K., ‘Synthesis of power radiation patterns for linear array antennas’, IEE Proc., Vol. 134, Pt. H, No. 3, pp 285–296, June 1987.Google Scholar
  3. 3.
    Schell, A.C., ‘The antenna as a spatial filter’, Chapter 26 in Antenna Theory (Part 2), Collin, R.E. and Zucker, F.J. (eds), Antenna Theory, Parts 1 and 2, McGraw-Hill, New York, 1969.Google Scholar
  4. 4.
    Woodward, P.M., Probability and Information Theory, with Applications to Radar, Pergamon Press, 1953; republished by Artech House, 1980.Google Scholar

Copyright information

© S. Drabowitch, A. Papiernik, H. Griffiths, J. Encinas and B. L. Smith 1998

Authors and Affiliations

  • Claude Shannon

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