Low noise microwave amplifier

Details Low noise microwave amplifier Low noise microwave amplifier

1987-08-07

1989-02-07

Laroche, Eugene R.

Wave transmission lines and networks

Coupling networks

Balanced to unbalanced circuits

333 21R, 330286, 455328, H03H 500

Patent

active

048034460

ABSTRACT:
A low noise microwave amplifier wherein a length of a pair of broad or wider walls inside the rectangular waveguide is shortened at least near a portion where a probe for introducing a microwave signal into the amplifying portion is provided. A cutoff frequency of the waveguide near the portion where the probe is provided is raised and comes to 80% to 90% of the lower limit of the frequency of the desired amplification band of the amplifier. An input microwave having a frequency component below the cutoff frequency is prevented from flowing into the amplifier, whereby the generation of oscillation is effectively prevented.

REFERENCES:
patent: 3157845 (1964-11-01), White
patent: 4168478 (1979-09-01), Schuegraf
patent: 4291415 (1981-09-01), Buntschuh
patent: 4409566 (1983-10-01), Patton et al.
patent: 4540959 (1985-09-01), Saad
patent: 4679249 (1987-07-01), Tanaka et al.

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