High-gain amplifier

Details High-gain amplifier High-gain amplifier

1999-03-18

2000-09-19

Pascal, Robert

Amplifiers

With distributed parameter-type coupling means

330 54, 333251, H03F 360

Patent

active

061218332

ABSTRACT:
To implement a high-gain amplifier in a microwave frequency band, it is proposed to interconnect amplification circuits and to cover the housing that contains them with a lid. In the space between the lid and the amplification circuits, inside the housing, waveguides are provided whose cutoff frequency is such that it allows none of the modes that can be present at the frequencies of the working band to propagate. It is shown that, by forming such waveguides in said space, instead of filling it with absorbents, much better radio isolation is obtained between the output and the input to avoid interfering reinjections. As a result, in the same housing, it is possible to achieve amplification of up to 90 dB, whereas, hitherto, the limit of 45 dB per housing could not be exceeded.

REFERENCES:
patent: 4429286 (1984-01-01), Nichols et al.
patent: 4672328 (1987-06-01), Adachi et al.
patent: 4713634 (1987-12-01), Yamamura
patent: 5115245 (1992-05-01), Wen et al.
patent: 5235208 (1993-08-01), Katoh

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