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Switchable beamwidth monopulse method and system

  • US 3,965,475 A
  • Filed: 05/30/1975
  • Issued: 06/22/1976
  • Est. Priority Date: 05/30/1975
  • Status: Expired due to Term
First Claim
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1. A switchable beamwidth monopulse antenna having selectively a wide beamwidth mode and a narrow beamwidth mode responsive to a beamwidth selection command source, the antenna including a curved reflector having a boresight axis with a focal region of the reflector lying on said axis, there being associated with the antenna an Airy disc lying in the focal region, said Airy disc surrounded by an Airy ring, comprising:

  • a first set of monopulse feeds located in an effective region of said Airy disc of said antenna;

    a second set of monopulse feeds located outside said Airy disc in the region of said Airy ring;

    first switching means for causing said antenna to operate in the narrow beamwidth mode including means connected to said first set of feeds for developing first sum and difference channel signals;

    second switching means for causing said antenna to operate in the wide beamwidth mode including means connected to said second set of feeds for developing second sum and difference channel signals, means for attenuating and phase shifting said first sum channel signal, and means for adding together said second sum channel signal and the output of said attenuating means;

    said first and second switching means controlled by said beamwidth selector command source.

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