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RASTER SCAN ANTENNA

  • US 3,766,558 A
  • Filed: 09/17/1971
  • Issued: 10/16/1973
  • Est. Priority Date: 09/17/1971
  • Status: Expired due to Term
First Claim
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1. An antenna scanning arrangement comprising:

  • a. first means for generating from a fixed prime frequency signal fo and a variable steering frequency signal fs first and second frequencies of fo + fs and fo - fs;

    b. second means operating on one of said first and second signal frequencies to provide N simultaneous signal portions thereof of the same frequency and each having a unique phase which varies progressively from one another in predetermined increments;

    c. third means separately coupling each of said N simultaneous signal portions with the untreated other one of said first and second signal frequencies for providing N separate output signals each having the same harmonic frequency of fo and progressively varying in phase from one another in said predetermined increments; and

    d. N radiating elements in an array of predetermined arrangement coupled to said third means for radiating signal energy responsive to said N separate output signals applied thereto in one-to-one correspondence, wherein said second means is comprised of a primary phase shifting device having a plurality of terminals for providing simultaneous outputs varying in phase from one another progressively in said predetermined manner, and a plurality of secondary phase shifting devices each having a plurality of terminals for providing simultaneous outputs varying in phase from one another progressively in a predetermined manner, said secondary phase shifting devices each being separately coupled between a terminal of said primary phase shifting device and said third means, and wherein said radiating elements are arranged in a two-dimensional array and said primary and secondary phase shift devices are comprised of delay lines having taps arranged periodically thereon.

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