Oscillators – With distributed parameter resonator
Patent
1986-04-10
1987-06-16
Grimm, Siegfried H.
Oscillators
With distributed parameter resonator
331107DP, 331117D, 333228, 333230, 333233, H03B 518, H01P 706
Patent
active
046738940
ABSTRACT:
A microwave oscillator having very low phase noise characteristics has a reflection oscillator circuit coupled to a right-circular cylindrical resonant cavity designed to operate in the TE.sub.011 mode. The resonator length L and inner diameter D are restricted to a range of values such that (D/L).sup.2 is less than 2.5 but greater than 1.7. To suppress the TM.sub.111 resonant modes in the resonator, two techniques are employed. A single tuning post is disposed on either resonator end plate at a point where the TM.sub.111 electric field Z-component is a maximum. The post length is adjustably fixed to maximize the output microwave power at the cavity output port. Each end plate also has a continuous gap separating each plate from the housing to suppress electric field currents of the TM.sub.111 mode flowing on the inner surface of the resonator.
REFERENCES:
Nagano et al, "Highly Stabilized Half-Watt IMPATT Oscillator", IEEE Transactions on Microwave Theory and Techniques, vol. MTT-18, No. 11, Nov. 1970, pp. 885-890.
van der Heyden, "Design of Stable, Very Low Noise, Cavity Stabilized IMPATT Oscillators for C Band", IEEE Trans. Microwave Theory and Techniques, vol. MTT-25, Apr. 1977, pp. 318-323.
California Microwave, Incorporated
Gilbert D.
Grimm Siegfried H.
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