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Phased array antenna

  • US 4,123,759 A
  • Filed: 03/21/1977
  • Issued: 10/31/1978
  • Est. Priority Date: 03/21/1977
  • Status: Expired due to Term
First Claim
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1. An antenna system for producing from a fixed array of active antenna elements which are each omnidirectional in a plane, a sensitivity pattern that is directional in said plane and which can be rotated around the array, comprising at least three of said elements each located at the corner of a regular polygon, and means for exciting all of the elements with currents of substantially equal magnitudes that are instantaneously in the same phase at two of said corners next adjacent and on either side of a third of said corners, and different in phase by substantially 90 electrical degrees at said third corner, the distance between two adjacent corners of said polygon being in the range substantially one-quarter to substantially 0.288 of the length of a wave at the mid-frequency of the operating frequency band of said system.

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