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Active transmit phased array antenna with amplitude taper

  • US 5,504,493 A
  • Filed: 05/09/1995
  • Issued: 04/02/1996
  • Est. Priority Date: 01/31/1994
  • Status: Expired due to Term
First Claim
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1. A phased array transmitting antenna system for generating multiple amplitude tapered independent simultaneous microwave signal beams, comprising:

  • an array of antenna units, a plurality of said antenna units of said array comprising a plurality of substantially identical microwave power amplifiers and coupler means for imparting a predetermined phase shift between microwave signals output from said plurality of microwave power amplifiers for providing orthogonal microwave energy signals having selected phases;

    each of said plurality of said antenna units of said array transmitting one of multiple, simultaneous microwave beams; and

    each of said plurality of said antenna units further comprising a radiating element responsive to said microwave signals output from individual ones said plurality of microwave power amplifiers for transmitting said microwave signals into space as a beam having a direction and shape, each of said individual ones of said plurality of microwave power amplifiers having an output coupled to a respective one of said radiating elements;

    wherein all of said plurality of microwave power amplifiers of said array operate with a same power level, wherein first selected ones of said plurality of antenna units radiate with a power level that is n times a power level of second selected ones of said plurality of antenna units for providing a predetermined amplitude taper across said array, wherein n is an integer that is greater than one, and wherein said first selected ones of said plurality of antenna units comprise one of said radiating elements that is coupled to the outputs of n of said microwave power amplifiers.

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