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Broadband isotropic antenna with fiber-optic link to a conventional receiver

  • US 4,091,327 A
  • Filed: 03/02/1977
  • Issued: 05/23/1978
  • Est. Priority Date: 03/02/1977
  • Status: Expired due to Term
First Claim
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1. A field intensity measuring system particularly adapted for near-zone electromagnetic fields comprising in combination:

  • a plurality of mutually orthogonal electrically short dipole antennas responsive to a respective orthogonal RF field component of a field of unknown polarization, each dipole antenna including respective first electrical circuit means interiorally thereof;

    said first circuit means including RF amplifier circuit means coupled to its respective dipole antenna for amplifying the RF field component sensed thereby, and optical energy generating means coupled to said RF amplifier circuit means, said generating means providing an optical carrier output signal which is modulated by the amplified RF signal provided by said RF amplifier circuit means;

    respective optical carrier guide means coupled to said optical energy generating means;

    respective photo-detector means coupled to said optical carrier guide means and being operable to demodulate the RF modulated optical carrier signal translated thereby to provide respective field component RF signals;

    second circuit means coupled to said field component RF signals and being operative to provide a respective measured value signals thereof; and

    third circuit means coupled to said second circuit means and being operative to process said measured values signals of said field component RF signals to provide a composite measured value signal indicative of the effective field intensity in the proximate region of said dipole antennas.

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