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:
Apr. 26, 2005
Filed:
Oct. 30, 2003
Kosuke Nishimura, Ube, JP;
Masataka Fujinaga, Ube, JP;
Masahide Kondo, Ube, JP;
Ube Industries, Ltd., Yamaguchi, JP;
Abstract
A band-pass filter has a ladder-type circuit including first and second terminals whose characteristic impedances are Z, and series elements and shunt elements disposed between a first terminal and a second terminal, each of the series elements and shunt elements containing a film bulk acoustic resonator. Assuming that characteristic impedance of any one of the series elements is Zand that characteristic impedance of any one of the shunt elements is Z, the characteristic impedances Z, Z, and Zhave a relation of 1<(Z/Z)<2, preferably 1.3<(Z/Z)<1.7, and 0.5<(Z/Z)<1, preferably 0.6<(Z/Z)<0.8.