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:
Mar. 17, 2009
Filed:
Nov. 16, 2007
Yasuhiro Fujiki, Phoenix, AZ (US);
Kosuke Ishida, Yokohama, JP;
Yasuhiro Fujiki, Phoenix, AZ (US);
Kosuke Ishida, Yokohama, JP;
Murata Manufacturing Co., Ltd., Kyoto, JP;
Abstract
A multilayer directional coupler which is easy to mass-produce and reduce in size, in which fine setting of the degree of electromagnetic coupling is facilitated, and which has a large bandwidth ratio, includes magnetic substrates, a laminate including first and second transformers, and external electrodes. One external electrode, which is connected to two ends of a primary coil of the first transformer, defines an input end for a main signal, and another external electrode defines an output end. A further external electrode, which is connected to two ends of a secondary coil of the second transformer, defines an output end for a sub-signal. A winding length ratio Nof the secondary coil to primary coil of the first transformer and a winding length ratio Nof the primary coil to secondary coil of the second transformer are each set to a value that is greater than about 1 and not greater than about 10. A ratio of the winding length ratio Nto the winding length ratio Nis greater than about 0.5 and less than about 2.0.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile