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Negative resistance high-Q-microwave oscillator

  • US 3,913,035 A
  • Filed: 07/01/1974
  • Issued: 10/14/1975
  • Est. Priority Date: 07/01/1974
  • Status: Expired due to Term
First Claim
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1. A negative resistance microwave oscillator comprising in combination:

  • a low-Q resonating means including a negative resistance device which is disposed into and within a cylindrical cavity for generating microwave energy in a range of predetermined frequencies;

    bias means electrically connected to said negative resistance device for providing a direct current bias to said negative resistance device for providing a direct current bias to said negative resistance device of sufficient energy to generate said microwave energy;

    a high-Q resonating means resonant at a predetermined frequency and electromagnetically connected in series with said low-Q resonating means for receiving said microwave energy from said low-Q resonating means and reflecting back a substantial portion of said microwave energy at said predetermined frequency to said low-Q resonating means to maintain microwave frequency oscillation at said predetermined frequency;

    first dissipative means electromagnetically connected in series with said high-Q resonating means and said low-Q resonating means for receiving said microwave energy at frequencies other than said predetermined frequency and dissipating said microwave energy at the undesirable frequencies to enhance frequency stability of the microwave oscillator;

    first microwave transmission means electromagnetically coupled to said low-Q resonating means for transmitting said microwave energy supplied directly thereto from said low-Q resonating means at said predetermined frequency to an oscillator load; and

    said bias means including transmission means electrically connected to said negative resistance device for applying direct current bias thereto, second dissipating means enclosing a first portion of said transmission means for dissipating microwave energy at undesired microwave frequencies, and coaxial transmission means enclosing a portion of said transmission means for directly reflecting back energy at said predetermined frequency to said negative resistance device.

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