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Nonlinear design of multiple-cavity switchable dielectric-resonator oscillators

Nonlinear design of multiple-cavity switchable dielectric-resonator oscillators

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The application of nonlinear CAD techniques to the design of multiple-cavity dielectric-resonator oscillators is demonstrated. The circuit topology consists of an FET oscillator which can be coupled to one of several dielectric resonators by means of a diode switching network. The circuit is numerically designed as a whole making use of a novel broadband optimisation technique especially devised for autonomous nonlinear circuits. At each fundamental frequency of interest the steady state of oscillation is determined by harmonic-balance analysis and at the same time the oscillator is tuned to the prescribed frequency by changing a parameter of the corresponding resonator. The electrical performance is simultaneously specified at all the fundamentals, and the optimisation is carried out with respect to the circuit parameters of the frequency-invariant part of the network.

References

    1. 1)
      • Rizzoli, V., Costanzo, A., Cecchetti, C.: `Numerical optimization of microwave oscillators and VCOs', IEEE MTT-S Int. Microwave Symp. Dig., 1993, Atlanta, p. 629–632.
    2. 2)
      • Rizzoli, V., Costanzo, A., Neri, A.: `An advanced empirical MESFET model for use in nonlinear simulation', Proc. 22nd European Microwave Conf., 1992, Helsinki, p. 1103–1108.
    3. 3)
      • Khanna, A.P.S., Soohoo, R.: `Fast switching X and Ku band multi frequency dielectric resonator oscillator using a single GaAs FET', IEEE MTT-S Int. Microwave Symp. Dig., 1987, Las Vegas, p. 189–191.
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