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Multi-band planar antenna array

  • US 4,772,890 A
  • Filed: 03/05/1985
  • Issued: 09/20/1988
  • Est. Priority Date: 03/05/1985
  • Status: Expired due to Fees
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First Claim
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1. An antenna comprising,a planar antenna (100) including a main array (110) comprised of a plurality of coplanar antenna sub-arrays (10),each of said antenna sub-arrays comprises a multilayer structure which includes:

  • a radiating layer (30) including a plurality of at least three groups of radiating elements (11, 12,

         13) which are respectively capable of operating with and radiating electromagnetic signals of different frequency bands;

    the radiating elements in each group are substantially identical to each other in size and configuration;

    the radiating elements in each group are substantially different in size from the radiating elements in the other groups;

    the radiating elements in different groups are operable for radiating electromagnetic signals of different frequency bands wherein the frequency bands differ by approximately 50% of the mid-frequency band and have a bandwidth of approximately 10%-20% of the mid-frequency;

    said different frequency bands comprise the X band, the C band and the Ku band;

    first and second conductors related to each of said groups of radiating elements and disposed at said radiating layer;

    said first conductor related to each group of radiating elements connected to a first position on each of said radiating elements in a group of radiating elements capable of operating at the same frequency band;

    said second conductor related to each group of radiating elements connected to a second position on each of said radiating elements in a group of radiating elements capable of operating at the same frequency band;

    source means (34) for supplying energy to said radiating elements via the respective first and second conductors related to a group of radiating elements to produce the electromagnetic signals radiated thereby;

    control means for controlling the selective connection of said source means to different positions on said radiating elements in order to achieve either left-hand-circular polarization or right-hand-circular polarization;

    a reflecting layer (32) of metal for directing the electromagnetic signals radiated by said radiating elements included at said radiating layer;

    a first electrically insulating layer (31) interposed between said radiating layer and said reflecting layer;

    a polarizing layer (22) disposed over said radiating layer and including a pattern (22A) of metal thereon for influencing the polarization of the electromagnetic signals radiated by said radiating elements of said radiating layer;

    a signal forming layer (26) of metal disposed over said polarizing layer;

    a second electrically insulating layer (29) interposed between said signal forming layer and said radiating layer; and

    a third electrically insulating layer (25) interposed between said polarizing layer and said signal forming layer,each said insulating layer is formed of a closed-cell polystrene material.

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