Patent ID: 6111474
Filing Date: 2000-08-29
Classification: H01Q

Abstract:
A low-noise amplifying device which is connected to a low-noise amplifier circuit and which receives a radio wave in a Ka-band of 17 GHz to 23 GHz, comprising:a planar wiring board having a first end and a second end;a microstrip extending across an upper surface of said wiring board between said first and second ends of said wiring board, wherein said first end is connected to an antenna probe via one end of said microstrip, and wherein said second end is coupled to said low-noise amplifier circuit via the other end of said microstrip;a planar ground pattern which is formed on a lower surface of said wiring board; anda waveguide having an upper planar surface which is to be secured to said wiring board so as to sandwich said ground pattern therebetween,wherein said wiring board is fixed to said waveguide upper planar surface by a fixing member located at a central portion of said wiring board and substantially nearer to said antenna probe at said first end than to said second end so as to provide a stable gain and reduced noise figure, thereby achieving a tight adhesion between said ground pattern and said waveguide upper planar surface.