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Underground antenna

  • US 3,346,864 A
  • Filed: 09/09/1966
  • Issued: 10/10/1967
  • Est. Priority Date: 09/09/1966
  • Status: Expired due to Term
First Claim
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1. AN UNDERGROUND ANTENNA IN A MOUNTAIN OR LARGE HILL HAVING A ROCK SUB-SURFACE AND A SURFACE SLOPE GREATER THAN ABOUT 10* IN A DESIRED AZIMUTH DIRECTION WHICH COMPRISES A RESONANT ANTENNA IN SAID ROCK SUB-SURFACE, THE DEPTH OF SAID ANTENNA BEING AT LEAST APPROXIMATELY ONETENTH WAVELENGTH IN THE MEDIUM AT THE OPERATING FREQUENCY, THE ELECTRICALLY CONDUCTIVE SURFACE OF SAID ANTENNA BEING CLOSELY ADJACENT SAID SUB-SURFACE ROCK IN CLOSE COUPLING RELATIONSHIP THEREWITH, SAID ANTENNA HAVING A POSITION AND ORIENTATION PREDETERMINED TO YIELD A RADIATION PATTERN HAVING A MAJOR LOBE DIRECTED TOWARD SAID SURFACE SLOPE AND A REFRACTED BEAM IN AIR HAVING NEAR-MAXIMAL RADIATION VECTORS AT SMALL ANGLES TO THE HORIZONTAL IN SAID DESIRED DIRECTION.

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