Microwave amplifying apparatus

Details Microwave amplifying apparatus Microwave amplifying apparatus

1986-10-24

1987-12-29

Wan, Gene

Amplifiers

With semiconductor amplifying device

Including distributed parameter-type coupling

330 56, H03F 360

Patent

active

047163828

ABSTRACT:
A microwave amplifying apparatus includes a waveguide which is shorted at one end and supplied with a TM mode or a TE mode signal, a pickup probe mounted on the waveguide for converting the signal into a TEM mode signal, and microstrip lines and field effect transistors, or amplifier elements, for amplifying the TEM mode signal. A matching device is arranged on the shorted waveguide adjacent to an incidence side with respect to the pickup probe while an input terminal of the first-stage amplifier element is directly interconnected to an output terminal of the pickup probe. The device is, therefore, free from a signal loss otherwise developed between the pickup probe and the initial-stage amplifier element. The matching device consists of three conductive rods which are spaced a quarter-wavelength distance from each other, and three lock nuts for fixing the conductive rods.

REFERENCES:
patent: 4303892 (1981-12-01), Weller et al.

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