Frequency tunable microwave apparatus having a variable impedanc

Details Frequency tunable microwave apparatus having a variable impedanc Frequency tunable microwave apparatus having a variable impedanc

1976-01-26

1977-01-25

Rolinec, R. V.

Amplifiers

Signal feedback

Combined with control of bias voltage of signal amplifier

307 883, 330 56, 330 61A, 330195, 330188, 331 99, 331107R, H03F 310

Patent

active

040053725

ABSTRACT:
A frequency tunable microwave apparatus including a semiconductor TRAPATT diode generating a microwave signal at its fundamental, second and third harmonic frequencies. Energy is extracted at the second harmonic frequency and a certain impedance loading is provided at the fundamental frequency and third harmonic by a variable impedance hybrid idler circuit. The hybrid idler circuit comprises a distributed transmission line serially connected to a lumped variable capacitor. Variations in the capacitance of the variable capacitor tune the fundamental frequency without substantially varying the impedance loading conditions of the diode allowing energy to be extracted at the second harmonic frequency throughout the tunable frequency range.

REFERENCES:
patent: 3882420 (1975-05-01), Liu
patent: 3909740 (1975-09-01), Clorfeine

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