The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 28, 1994
Filed:
Dec. 10, 1992
Applicant:
Inventors:
Iwamichi Kohjiro, Komoro, JP;
Masahito Numanami, Komoro, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H03F / ; H01L / ;
U.S. Cl.
CPC ...
330286 ; 257728 ; 330307 ;
Abstract
A high-frequency power amplifier device is provided in which the number of ground lines on the electronic parts mounting face of a strip line substrate having microstrip lines is reduced or eliminated. Specifically, a metallic cover extending in parallel with the mounting face of the strip line substrate is grounded, and the microstrip lines between this cover and the strip line substrate are electrically connected by connecting means such as capacitors and/or conductors.