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:
Nov. 29, 2005
Filed:
Sep. 25, 2002
Masayuki Nibe, Osaka, JP;
Masayuki Nibe, Osaka, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A rat race circuit has an annular transmission line formed on a microstrip dielectric substrate. A terminal for portis formed at any given position of the annular transmission line. Respective terminals for portand portare formed at respective positions distant from the position of portin the counter-clockwise and clockwise directions each by a distance of λg/4 (λg: effective wavelength). Moreover, at the position distant from the position of portin the counter-clockwise direction by the distance of λg/4, a terminator resistor (R=50Ω) is formed. A local oscillator signal is supplied to port, and first and second mixer inputs are connected respectively to portand port. The local oscillator signal divider and a low noise converter using the divider are thus provided that are scarcely influenced by matching with respect to mixers and provide stable performance and high isolation.