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MICROWAVE OSCILLATOR WITH MULTIPLE GUNN DIODES IN A CAVITY RESONATOR

  • US 3,737,802 A
  • Filed: 11/12/1971
  • Issued: 06/05/1973
  • Est. Priority Date: 11/12/1971
  • Status: Expired due to Term
First Claim
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1. A solid state oscillator comprising:

  • means forming a hollow rectangular waveguide passage, said waveguide passage being bordered by opposed top and bottom walls and opposed right and left side walls, said walls being of electrically conductive material and electrically in common;

    a terminating back wall for terminating said waveguide passage to microwave energy;

    first and second Gunn diodes located in said passage spaced from said back wall, each of said Gunn diodes containing a first terminal of a first polarity and a second terminal of a second polarity;

    a post of electrically conductive material located in said passage spaced from said walls, said post having a predetermined height between its first and second ends less than the distance between said top and bottom walls of said waveguide passage and a maximum thickness dimension no more than one-quarter of the distance between said right and left side walls;

    said first Gunn diode positioned at said first end of said post having its first terminal electrically in common with said first end of said post and having its second terminal electrically in common with said top waLl of said waveguide passage;

    said second Gunn diode positioned at said second end of said post and having its first terminal electrically in common with said second end of said post and having its second terminal electrically in common with said bottom wall of said waveguide passage;

    whereby said corresponding first terminals of each diode are electrically in common and said corresponding second terminals of each diode are electrically in common;

    said first diode, said second diode, and said post being aligned substantially along a common axis to form a mechanical series arrangement, said common axis oriented substantially parallel to said side walls and perpendicular to said top and bottom walls and located at a predetermined position along the length of said waveguide passage spaced from said terminating back wall;

    a third and fourth Gunn diode located in said passage spaced from said back wall, each of said third and fourth Gunn diode having a first terminal of a first polarity and a second terminal of a second polarity;

    a second post of electrically conductive material spaced from said first post, said second post having a predetermined height between its first and second ends less than the distance between said top and bottom walls and a maximum thickness no more than one-quarter the distance between said right and left side walls;

    said third Gunn diode positioned at said first end of said second post having its first terminal electrically in common with said first end of said second post and having its second polarity terminal electrically in common with said top wall of said waveguide passage;

    said fourth Gunn diode positioned at the second end of said second post and having its first terminal electrically in common with said second end of said second post and having its second terminal electrically in common with said bottom wall of said waveguide passage;

    said third and fourth Gunn diodes and said second post being aligned substantially along a common axis to form a mechanical series arrangement, said common axis oriented substantially parallel to said side walls and perpendicular to said top and bottom walls and located at the same predetermined position along the length of said passage as said common axis of said first mechanical series arrangement;

    microwave energy coupling means connected to an end of said waveguide passage spaced from said diodes and remote from said back wall for coupling microwave energy to a load;

    a source of bias voltage for said diodes, said bias source having a first output terminal of a first polarity and a second output terminal of a second polarity;

    first electrically conductive means connecting said second output terminal of said source electrically in common with said waveguide walls, and second electrical conductor means connecting said first output terminal to said post; and

    third electrical conductor means connecting said second post electrically in common with said first output terminal of said bias source;

    whereby all four diodes generate microwave frequency energy of the same frequency and phase.

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