Microwave preamplifier

Details Microwave preamplifier Microwave preamplifier

1984-07-16

1986-11-18

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including distributed parameter-type coupling

330277, H03F 360

Patent

active

046238484

ABSTRACT:
An input matching circuit for a first stage amplifying element of a microwave preamplifier comprises at least one capacitive open-ended stub which is located in the vicinity of an input terminal of the first stage amplifying element so that the structure of the input matching circuit is simple. Input impedance of the first stage amplifying element is designed to assume a state of impedance matching for minimum noise, while the distance between the first stage amplifying element and a second stage amplifying element is appropriately determined with an input matching circuit of the second stage amplifying element being appropriately set. With this arrangement input VSWR of the preamplifier is set to a value smaller than an input VSWR of the first amplifying stage, and therefore it is possible to provide a microwave preamplifier which shows satisfactory input VSWR characteristic and noise figure such that the input VSWR of the preamplifier is improved when compared with the input VSWR exhibited on impedance matching for minimum noise while the noise figure is less deteriorated compared to the noise figure exhibited on impedance matching for minimum noise.

REFERENCES:
patent: 3710272 (1973-01-01), Ayaki

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