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. 09, 2004
Filed:
Sep. 12, 2000
Kazumasa Kohama, Kanagawa, JP;
Daisuke Fukui, Kanagawa, JP;
Sony Corporation, , JP;
Abstract
An antenna switching circuit and communication system capable of reducing a high-order harmonic component radiated from the antenna used for transmission and reception. A fundamental wave passes through a signal transmission line between an antenna switch and a transmitting circuit, a filter circuit is connected for reflecting the high-order harmonic component, the high-order harmonic component generated due to linear distortion of the antenna switch is propagated toward the antenna and the transmitting circuit, the high-order harmonic component is reflected at a node of the filter circuit, and the reflected signal is propagated toward the antenna through the antenna switch. By suitably controlling a reflection characteristic of the filter circuit and a line of the signal transmission line, the high-order harmonic components on the transmission line are cancelled out and the high-order harmonic component from the antenna can be decreased.