Radio frequency oscillator having capacitively coupled variable

Details Radio frequency oscillator having capacitively coupled variable Radio frequency oscillator having capacitively coupled variable

1997-04-25

2000-05-02

Kinkead, Arnold

Oscillators

Solid state active element oscillator

Transistors

331 96, 331177V, 331107SL, 333205, 333235, H03B 502, H03B 518

Patent

active

06057741&

ABSTRACT:
A radio frequency oscillator having: a resonant circuit; a gain element coupled in feedback relationship with the resonant circuit; and a variable reactance device, such as a varactor diode, adapted for coupling to a control signal for varying the reactance of the device. The variable reactance device is coupled to the resonant circuit with a coupling factor less than one. The resonant circuit comprises a planar microstrip transmission line structure. The varactor diode is coupled to the microstrip transmission line through a strip conductor disposed adjacent to, and dielectrically spaced from, a strip conductor of the resonant circuit. In one embodiment, the strip conductors are disposed in a side-by-side, dielectrically spaced relationship. In another embodiment, the strip conductors are disposed in a face-to-face, dielectrically spaced relationship.

REFERENCES:
patent: 3996529 (1976-12-01), Curtice
patent: 4871983 (1989-10-01), Graycar
patent: 5483206 (1996-01-01), Lohninger

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