Power amplifier tank circuit

Details Power amplifier tank circuit Power amplifier tank circuit

1980-04-09

1982-12-07

Mullins, James B.

Amplifiers

With distributed parameter-type coupling means

Waveguide, cavity, or concentric line resonator

333226, H03F 360, H01P 704

Patent

active

043630006

ABSTRACT:
An RF tank circuit for a transmitter power amplifier stage including a half-wave length "folded" coaxial transmission line as an anode tuning device. The tank circuit has a grounded outer conductor and an ungrounded inner conductor, the latter to be operated at a high RF potential. The outer conductor is connected electrically to a third conductor which is adjustably extensible into the ungrounded inner conductor, hence, suggesting a folded effect for the outer conductor and the third conductor in combination. The third conductor has a bellows which can be expanded or contracted by drive means disposed exteriorly of the cavity, thereby to fine-tune the cavity to a selected frequency. The third conductor has mounting means which permit its extension into the inner conductor to be variable, thus allowing for coarse adjustment of the bandwidth, prior to the fine-tuning accomplished by suitable bellows-drive controls.

REFERENCES:
patent: 2421784 (1947-06-01), Haeseler et al.
patent: 3452293 (1969-06-01), De Long et al.

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