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Miniature horn antenna array for circular polarization

  • US 4,527,165 A
  • Filed: 03/03/1983
  • Issued: 07/02/1985
  • Est. Priority Date: 03/12/1982
  • Status: Expired due to Term
First Claim
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1. An antenna element for circularly-polarized high-frequency signals, said antenna element comprising, in succession:

  • a. a relatively thick first layer of insulating material having an opening therethrough defined by conductive side walls which are slanted to form a horn of square cross-section;

    b. a relatively thin second layer of insulating material disposed adjacent to one side of the first layer where the horn has its narrowest cross-section, said second layer supporting a conductor oriented relative to the horn to couple signals having a first linear polarization;

    c. a relatively thick third layer of insulating material disposed adjacent to the second layer, said third layer having an opening therethrough defined by conductive sidewalls which are stepped to form a first waveguide having two different cross-sectional areas, one end of said first waveguide facing and having the same square cross-section as the horn'"'"'s narrowest end, and an opposite end of said waveguide having a smaller, rectangular cross-section;

    d. a relatively thin fourth layer of insulating material disposed adjacent to the third layer, said fourth layer supporting a conductor oriented relative to the rectangular end of the first waveguide to couple signals having a second linear polarization which is perpendicular to that of said first linear polarization; and

    e. a relatively thick fifth layer of insulating material disposed adjacent to the fourth layer, said fifth layer having an opening therein defined by conductive sidewalls forming a second waveguide, said opening having a depth smaller than the thickness of the fifth layer, one end of said second waveguide facing and having the same rectangular cross-section as the smaller end of the first waveguide, and an opposite end of said second waveguide being short-circuited.

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