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:
Sep. 18, 2007
Filed:
May. 13, 2004
Yoshihisa Amano, Nara, JP;
Yoshihisa Amano, Nara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
The input side and the output side of a first bandpass filter circuit BPFare magnetically coupled to each other in a jump-coupling manner by the first mutual inductance (L, L) for connection between an input port IN and the input side of the first bandpass filter circuit BPFand connection between an output port OUT and the output side of the bandpass filter circuit BPF. The input side and the output side of a second bandpass filter circuit BPFwhose center frequency is higher than that of the first bandpass filter circuit BPFare magnetically coupled to each other in a jump-coupling manner by the second mutual inductance (L, L) for connection between the input side of the first bandpass filter circuit BPFand the input side of the second bandpass filter circuit BPFand connection between the output side of the first bandpass filter circuit BPFand the output side of the second bandpass filter circuit BPF. This multiband filter circuit is capable of improving the degree of steepness by generating a number of transmission zeros in the vicinity of a plurality of passbands with a simple construction.