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High-yield active printed-circuit antenna system for frequency-hopping space radar

  • US 5,206,655 A
  • Filed: 03/06/1991
  • Issued: 04/27/1993
  • Est. Priority Date: 03/09/1990
  • Status: Expired due to Term
First Claim
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1. High-yield antenna system including an active printed-circuit planar antenna for pulsed frequency-hopping space radar electronically scanned in two planes, its timing diagram encompassing the transmission of a horizontal polarization pulse, the reception of echoes from a previous horizontal polarization pulse, the transmission of a vertical polarization pulse and the reception of echoes from a previous vertical polarization pulse, said system comprising, distributed on insulative substrates, several thousand MMIC active transmit-receive modules, each of which contains a switching device, amplifier means and a phase shifter, and each of which is connected to one of a plurality of printed-circuit radiating elements, each printed-circuit radiating element comprising a plurality of dual polarized square patches connected by microstrip lines adapted selectively to excite the patches with the same amplitude and the same phase at two perpendicular ports coupled to said switching device, said switching device switching between said two ports for selectively procuring transmission or reception with horizontal or vertical polarization.

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