Amplifiers – With semiconductor amplifying device – Including distributed parameter-type coupling
Patent
1993-08-09
1994-11-08
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including distributed parameter-type coupling
330307, H03F 360
Patent
active
053630602
ABSTRACT:
A microwave amplifier includes an amplifier, an impedance matching circuit for matching input and output impedances of the amplifier, and an open stub. The impedance matching circuit includes input and output side distributed constant lines each having a length equivalent to a 1/4 wavelength of a signal having the highest frequency in a desired frequency band. The open stub is disposed in the vicinity of the input or output side distributed constant line. The length of the open stub is varied to vary a narrow frequency band in which the maximum gain of the amplifier is attained. In this structure, the return loss is reduced and a uniform tuning in the frequency band is easily carried out using the open stub. In addition, the maximum potential of the amplifier is achieved in the desired frequency band.
REFERENCES:
patent: 5065117 (1991-11-01), Yoshimasu
patent: 5270668 (1993-12-01), Ikeda et al.
Mitsubishi Denki & Kabushiki Kaisha
Mottola Steven
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