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Broadband omnidirectional slot antenna with an electrical strap connector

  • US 4,086,598 A
  • Filed: 12/02/1976
  • Issued: 04/25/1978
  • Est. Priority Date: 12/02/1976
  • Status: Expired due to Term
First Claim
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1. A broadband omnidirectional slot antenna consisting of an electrically conductive tube at least λ

  • long, extending along a major axis, having a girth in the range λ

    /2 to λ and

    a slot of a length approximately λ

    /2 to λ and

    a width in the range λ

    /16 to 3 λ

    /16 extending through the tube wall parallel to the major axis;

    a two conductor transmission line for coupling energy from a signal source to the said slot antenna, one of said conductors connected to the inner wall of the said tube opposite the said slot;

    a conductive strap having one end thereof connected to one edge of the slot with λ

    /8 of the middle of the slot along the tube axis and the other end thereof connected to the other of said conductors, said strap having a dimension along the major axis, for most of the length of the strap, in the range greater than λ

    /16, and less than λ

    /4, and of length at least 11/2times the direct distance between the said connection point to the transmission line and the said slot edge.

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