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. 13, 2007
Filed:
Nov. 09, 2004
Shigeru Kataoka, Kawasaki, JP;
Shingo Matsuda, Nagaokakyo, JP;
Ichiro Kato, Kosai, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An amplifieramplifies a transmission signal, and outputs the amplified signal to an antenna. A directional couplercauses a portion of power passing through a first path connecting the amplifierand the antenna to branch to a second path. A detection sectiondetects an electrical parameter changing with a change in the intensity of power reflected from the antenna to the amplifier, thereby detecting the intensity of the reflected power. A control circuitchanges a proportion of power caused to branch to the second path by the directional coupler, based on the electrical parameter detected by the detection circuit. Thus, it is possible to provide a reflected power suppression circuit capable of facilitating size reduction and preventing a power amplifier from being damaged due to breakage of an antenna, while minimizing a power loss at the time of signal transmission.