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:
Oct. 24, 1989
Filed:
Jan. 15, 1988
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A mixer for outputting an intermediate frequency signal as the result of mixing of a radio frequency signal and a local oscillator signal which are inputted into the mixer. The mixer comprises a balanced-to-unbalanced conversion circuit and a bridge-coupled diode circuit and the balanced-to-unbalanced conversion circuit is constructed of first and second rat race circuits, one being for the radio frequencey signal and comprising a first ring-shaped line and the other being for the local oscillator signal and comprising a second ring-shaped line. The mixer is arranged to include a substrate having first and second pattern-forming surfaces and the first ring-shaped line of the first rat race circuit is formed as a pattern on the first pattern-forming surface of the substrate and the second ring-shaped line of the second rat race circuit is formed as a pattern on the second pattern-forming surface. The bridge-coupled diode circuit is positioned on the first pattern-forming surface thereof and inside the patterned first ring-shaped line.