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Antenna apparatus

  • US 5,784,034 A
  • Filed: 01/27/1997
  • Issued: 07/21/1998
  • Est. Priority Date: 11/18/1993
  • Status: Expired due to Term
First Claim
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1. An antenna apparatus, comprising:

  • a plurality of non-overlapping helical antennas, each including at least one conductive wire disposed directly on a dielectric cylinder, said at least one conductive wire is spirally wound at equal intervals with a predetermined pitch, said plurality of the helical antennas being axially aligned so that the axes of said helical antennas substantially coincide end-to-end with each other; and

    feeding means for feeding a signal to said at least one conductive wire of said helical antennas; and

    wherein at least one cylindrical conductive pipe is disposed inside said dielectric cylinder and substantially coaxial with at least one of said helical antennas and said feeding means for said at least one conductive wire of said helical antennas are disposed through the inside of said at least one conductive pipe; and

    wherein said at least one conductive pipe is electrically insulated from said helical antennas and said feeding means.

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