Electronically tunable resonator circuit

Details Electronically tunable resonator circuit Electronically tunable resonator circuit

1979-08-27

1982-07-06

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

330 61A, 333 11, 333185, 333215, 333217, H03H 1108, H03H 1110, H01P 138, H03F 3193

Patent

active

043385826

ABSTRACT:
An electronically adjustable capacitor (varactor), an active element such as a Field Effect Transistor arranged to exhibit negative resistance, and an inductor are arranged as a frequency tunable resonator suitable for use at microwave frequencies. The negative resistance of the active element may be adjusted to compensate for the resistance of the other resonator components such that the resonator exhibits very high Q and therefore high selectivity and low loss. The resonator may be used as a filter element in a tunable filter. Alternatively the negative resistance of the active element may be adjusted such that the resonator exhibits net negative resistance and may be incorporated in a tunable reflection type amplifier.

REFERENCES:
patent: 3079571 (1963-02-01), Elliot et al.
patent: 3110004 (1963-11-01), Pope
patent: 3737801 (1963-06-01), Adams et al.
patent: 4025872 (1977-05-01), Grayzel
patent: 4064525 (1977-12-01), Kano et al.
Bains et al.--"Analysis and Design of an X-Band Actively Compensated Impatt Diode Amplifier", IEEE Trans. On Microwave Theory and Techniques, Jan. 1979, pp. 17-23.

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