http://www.patents.ibm.com/cgi-bin/viewpat.cmd/5590031
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Chris Gupta
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SYSTEM FOR CONVERTING ELECTROMAGNETIC RADIATION ENERGY TO ELECTRICAL ENERGY 
U.S. Patent
                 5,590,031 
  SUMMARY
  BACKGROUND OF THE INVENTION 
  The invention relates generally to conversion of electromagnetic
radiation energy
  to electrical energy, and, more particularly, to conversion of high
frequency
  bandwidths of the spectrum of a type of radiation known as zero point
  electromagnetic radiation to electrical energy. 
  The existence of zero point electromagnetic radiation was discovered in
1958 by
  the Dutch physicist M. J. Sparnaay. Mr. Sparnaay continued the experiments
  carried out by Hendrik B. G. Casimir in 1948 which showed the existence of a
  force between two uncharged parallel plates which arose from electromagnetic
  radiation surrounding the plates in a vacuum. Mr. Sparnaay discovered
that the
  forces acting on the plates arose from not only thermal radiation but
also from
  another type of radiation now known as classical electromagnetic zero point
  radiation. Mr. Sparnaay determined that not only did the zero point
  electromagnetic radiation exist in a vacuum but also that it persisted
even at a
  temperature of absolute zero. Because it exists in a vacuum, zero point
radiation
  is homogeneous and isotropic as well as ubiquitous. In addition, since
zero point
  radiation is also invariant with respect to Lorentz transformation, the zero
  point radiation spectrum has the characteristic that the intensity of the
  radiation at any frequency is proportional to the cube of that frequency.
  Consequently, the intensity of the radiation increases without limit as the
  frequency increases resulting in an infinite energy density for the
radiation
  spectrum. With the introduction of the zero point radiation into the
classical
  electron theory, a vacuum at a temperature of absolute zero is no longer
  considered empty of all electromagnetic fields. Instead, the vacuum is now
  considered as filled with randomly fluctuating fields having the zero point
  radiation spectrum. The special characteristics of the zero point
radiation which
  are that it has a virtually infinite energy density and that it is
ubiquitous
  (even present in outer space) make it very desirable as an energy source.
  However, because high energy densities exist at very high radiation
frequencies
  and because conventional methods are only able to convert or extract energy
  effectively or efficiently only at lower frequencies at which zero point
  radiation has relatively low energy densities, effectively tapping this
energy
  source has been believed to be unavailable using conventional techniques for
  converting electromagnetic energy to electrical or other forms of easily
useable
  energy. Consequently, zero point electromagnetic radiation energy which may
  potentially be used to power interplanetary craft as well as provide for
  society's other needs has remained unharnessed. 
  There are many types of prior art systems which use a plurality of
antennas to
  receive electromagnetic radiation and provide an electrical output
therefrom. An
  example of such a prior art system is disclosed in U.S. Pat. No.
3,882,503 to
  Gamara. The Gamara system has two antenna structures which work in tandem
and
  which oscillate by means of a motor operatively attached thereto in order to
  modulate the radiation reflected from the antenna surfaces. The reflecting
  surfaces of the antennas are also separated by a distance equal to a quarter
  wavelength of the incident radiation. However, the Gamara system does not
convert
  the incident radiation to electrical current for the purpose of
converting the
  incident electromagnetic radiation to another form of readily useable
energy. In
  addition, the relatively large size of the Gamara system components make it
  unable to resonate at and modulate very high frequency radiation. 
  What is therefore needed is a system which is capable of converting high
  frequency electromagnetic radiation energy into another form of energy
which can
  be more readily used to provide power for transportation, heating,
cooling as
  well as various other needs of society. What is also needed is such a system
  which may be used to provide energy from any location on earth or in space.