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Antennas serve as our interface between guided wave propagation (a transmission line or a waveguide) and unguided wave propagation (free-space propagation). The authors use a transmitting antenna to launch a signal into free space in the hope that we can receive it at some remote location using a receiving antenna. The authors impress information on the signal, and, if we work things right, we can retrieve that information at the receiving end of the system. In this chapter, the authors will examine the characteristics of antennas as they affect the design of the receiver. The authors examine metrics describing how efficiently antennas launch and receive signals. The authors also discuss antenna properties that help mitigate the unkind effects of unguided propagation. Finally, the authors will develop models that will help us characterize an antenna when we use it in both its transmitting mode and its receiving mode.

Chapter Contents:

  • 4.1 Introduction
  • 4.2 Antenna Equivalent Circuits
  • 4.3 Aperture
  • 4.4 The Isotropic Radiator
  • 4.5 Antenna Gain, Beamwidth, and Aperture
  • 4.6 Bibliography
  • 4.7 Problems

Inspec keywords: receiving antennas; electromagnetic wave propagation; transmitting antennas; transmission lines

Other keywords: receiving antenna; receive signals; unguided wave propagation; transmitting antenna; transmitting mode; unkind effect mitigation; remote location; free-space propagation; transmission line; receiving mode

Subjects: Electromagnetic wave propagation; Single antennas

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