Defining the starting distance for the far field of antennas operating in any environment

M. N. Abdallah, T. K. Sarkar, Vikass Monebhurrun, M. Salazar-Palma

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The far field of an antenna is generally considered to be the region where the outgoing wavefront is planar and the antenna radiation pattern has a polar variation and is independent of the distance from the antenna. In this paper, the starting distance for the far field is defined for antennas operating in free space and over an imperfect ground plane. First, this paper intends to illustrate that 2D2 / λ formula, where D is the maximum dimension of the antenna and λ is the operating wavelength, is not universally valid, it is only valid for antennas where D >> λ. Second, this paper intends to compute a more specific constraint so instead of D >> λ we compute a threshold for D after which the 2D2 / λ formula applies. Third, this paper intends to properly interpret D in the formula 2D2 / λ when the antenna is operating over an imperfect ground plane. In this paper, we do not use 2D2 / λ for antennas operating over an imperfect ground instead we use a formula which depends on the transmitting and receiving antenna's heights over the air-Earth interface.

Original languageEnglish (US)
Title of host publication2016 IEEE Conference on Antenna Measurements and Applications, CAMA 2016
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781467389327
DOIs
StatePublished - Jan 12 2017
Event2016 IEEE Conference on Antenna Measurements and Applications, CAMA 2016 - Syracuse, United States
Duration: Oct 23 2016Oct 27 2016

Publication series

Name2016 IEEE Conference on Antenna Measurements and Applications, CAMA 2016

Other

Other2016 IEEE Conference on Antenna Measurements and Applications, CAMA 2016
CountryUnited States
CitySyracuse
Period10/23/1610/27/16

Keywords

  • Far Field
  • Near Field
  • Radial
  • Transverse

ASJC Scopus subject areas

  • Instrumentation
  • Radiation

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  • Cite this

    Abdallah, M. N., Sarkar, T. K., Monebhurrun, V., & Salazar-Palma, M. (2017). Defining the starting distance for the far field of antennas operating in any environment. In 2016 IEEE Conference on Antenna Measurements and Applications, CAMA 2016 [7815743] (2016 IEEE Conference on Antenna Measurements and Applications, CAMA 2016). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/CAMA.2016.7815743