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:
Sep. 20, 2005
Filed:
Apr. 15, 2002
Tatsuya Imaizumi, Tokyo, JP;
Hironori Okado, Tokyo, JP;
Hisahiro Yasuda, Tokyo, JP;
Naoto Kobayashi, Tokyo, JP;
Takashi Amano, Tokyo, JP;
Kazuya Maekawa, Tokyo, JP;
Tatsuya Imaizumi, Tokyo, JP;
Hironori Okado, Tokyo, JP;
Hisahiro Yasuda, Tokyo, JP;
Naoto Kobayashi, Tokyo, JP;
Takashi Amano, Tokyo, JP;
Kazuya Maekawa, Tokyo, JP;
Taiyo Yuden Co., Ltd., Tokyo, JP;
Abstract
The present invention relates mainly to a small dielectric antenna capable of obtaining a good VSWR characteristic even if it is placed in the vicinity of a grounding pattern when mounted on a circuit board. A dielectric antenna is formed in which a feed point of an antenna elementhaving a resonance frequency set to a first frequency in a first frequency band and a feed point of an antenna elementhaving a resonance frequency set to a second frequency are connected to an external feed terminal, and an open stubconnected to the antenna elementin the vicinity of the feed point. The open stubis provided to enable resonance at each of frequencies to be used while the lengths of the antenna elementsandare shorter than ordinary lengths determined according to the wavelengths of the frequency to be used. Further, even in the case of placement in the vicinity of a grounding conductor patternat the time of mounting on a circuit board, the frequency bandwidth through which a good VSWR characteristic can be obtained in a used frequency band can be extended.