Low noise microwave amplifier
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United States of America Patent
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Feb 7, 1989
Issued Date -
N/A
app pub date -
Aug 7, 1987
filing date -
Mar 28, 1985
priority date (Note) -
Expired
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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.
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