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:
Dec. 18, 2001
Filed:
Jul. 14, 1999
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A dual-frequency matching circuit of the present invention comprises an output terminal to which a load is connected, an input terminal through which an input signal is input to the load, a series resonance circuit, which is composed of a series capacitor and a series inductor connected in series to the series capacitor and disposed in such a manner that it is connected in series to the load when observed from the input terminal side, and a parallel resonance circuit, which is composed of a parallel capacitor and a parallel inductor connected in parallel to the parallel capacitor, and disposed in such a manner that it is connected in parallel to the entire portion of the load and the series resonance circuit when observed from the input terminal side. By this configuration, the problem contained in the conventional matching circuit that the matching of impedance at two arbitrary different frequencies is not made possible can be solved, and that since no transmission line is needed therein, the circuit can be minimized as a whole when frequency at which the matching operation is performed is set to a low frequency band.