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Beam-forming network

  • US 4,827,268 A
  • Filed: 08/14/1986
  • Issued: 05/02/1989
  • Est. Priority Date: 08/14/1986
  • Status: Expired due to Term
First Claim
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1. Apparatus for simultaneously forming a plurality of antenna beam signals for transmission by an antenna to a plurality of different zones using a plurality of transmit signals respectively corresponding to said zones, wherein each of the transmit signals includes a plurality of subsignals having respective preselected frequencies and each destined to be received at an associated location in the corresponding zone, comprising:

  • a first plurality of lines for respectively carrying said plurality of transmit signals and each including an input for receiving a corresponding one of said transmit signals; and

    a second plurality of spaced apart lines intersecting said first plurality of lines at crossover points of said first and second plurality of lines, each of said second plurality of lines being coupled with each of said first plurality of lines at said crossover points such that a portion of the energy of each of the transmit signals carried by each of said first plurality of lines is transferred to each of said second plurality of lines, each of said second plurality of lines having an output for continuously outputting said antenna beam signals,the distance between adjacent crossover points and the width of each of said first plurality of lines being preselected to produce a desired shift in phase of each of said subsignals whereby said subsignals are continuously steered to respectively associated locations in corresponding zones as a function of the frequencies of said subsignals,said second plurality of lines extending essentially radially away from a reference point such that said second plurality of lines diverge from each other,said first plurality of lines extending circumferentially about said reference point and being radially spaced relative to said reference point such that the distance between adjacent crossover points increase with increasing radial distance of the crossover points from said reference point.

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