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:
Jan. 24, 2006
Filed:
Oct. 03, 2002
Yoshihisa Amano, Nara, JP;
Yoshihisa Amano, Nara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A high-frequency filter circuit comprises a first coupled transmission line system (G) including a first line (TL) having a line end (A) serving as an input port () and a line end (B) serving as an open end and second and third lines (TLTL) provided on both sides of the first line (TL) and a second coupled transmission line system (G) including a first line (TL) having line end (A) serving as an output port () and a line end (B) serving as an open end and second and third lines (TLTL) provided on both sides of the first line (TL). In the first and second coupled transmission line systems (GG), the line ends (B) of the second lines (TL) and the line ends (A) of the third lines (TL) are open ends, and the line end (A) of the second line (TL) of one of the systems and the line end (B) of the third line (TL) of the other system are interconnected through phase lines (). Thus, a favorable filter characteristic of high steepness and low insertion loss can be obtained, and a high-frequency filter circuit easy to produce, suitable for MMIC, small, lightweight, and produced at low cost and a high-frequency communication device are provided.