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:
Feb. 27, 2007
Filed:
Dec. 24, 2003
Susumu Noda, Uji, JP;
Takashi Asano, Kyoto, JP;
Hitomichi Takano, Kadoma, JP;
Agency of Industrial Science and Technology, Saitama, JP;
Matsushita Electric Works, Ltd., Osaka, JP;
Abstract
The present invention aims to provide an electromagnetic wave frequency filter capable of transmitting an electromagnetic wave having a predetermined frequency between two waveguides with a high level of efficiency. This object is achieved by the following construction: A resonatorthat resonates with the electromagnetic wave having the predetermined frequency is located between an input waveguideand an output waveguideand close to the two waveguides. The output waveguideis designed so that it extends parallel to the input waveguidewithin a predetermined sectionlocated in proximity to the resonator, and its distance from the input waveguidein the other section is larger than that in the predetermined section. This construction allows the electromagnetic wave having the predetermined frequency to be transmitted between the input waveguideand the output waveguidevia the resonator, while preventing the other electromagnetic waves having different frequencies from being transmitted between the input waveguideand the output waveguideoutside of the predetermined section. The present electromagnetic wave frequency filter can be preferably constructed using a two-dimensional photonic crystal.