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Waveguide oscillator tunable through integrated varactor diode and coupling probe

  • US 4,999,587 A
  • Filed: 01/03/1990
  • Issued: 03/12/1991
  • Est. Priority Date: 01/20/1989
  • Status: Expired due to Fees
First Claim
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1. A tunable waveguide oscillator comprising a negative-resistance oscillator device in a waveguide, and variable reactance means comprising a varactor diode coupled to the oscillator device to permit electronic tuning of the operating frequency of the oscillator, the oscillator device having a resonant cap for coupling to the waveguide, and the reactance means having an electric probe which is orientated so as to couple to the electromagnetic field in the vicinity of the cap, characterised in that the reactance means comprising both the varactor diode and the probe is integrated in a circuit body mounted in the waveguide, and in that the probe is formed by an electrically conductive track on the circuit body, which track is separated from the resonant cap by a gap inside the waveguide, at which gap the track is coupled to the electromagnetic field in the waveguide.

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