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:
Jul. 26, 2005
Filed:
Apr. 19, 2002
Tadashi Oshiyama, Tomioka, JP;
Hirotoshi Mizuno, Tomioka, JP;
Yusuke Suzuki, Tomioka, JP;
Yokowo Co., Ltd., Tokyo, JP;
Abstract
The present invention provides a broad-band antenna for mobile communication in which a desired antenna characteristic is obtained in plural frequency bands of a portable phone or the like. A metal platehaving a suitable shape is disposed on an upper surface of a carrierprovided on a circuit boardand a first and a second antenna elements functioning as inverted-F antennas respectively resonant at a first frequency band and a second frequency band higher than the former are formed by electrically connecting the metal plateto a grounding plateand the circuit boardby an earthing terminaland a feed terminalrespectively. A third antenna elementhaving a base end electrically connected to the feed terminaland resonant at a third frequency band higher than the second frequency band is provided on a side surface of the carrierends of the second antenna element and the third antenna elementare disposed to be spaced from each other by a distance of 0.1 wavelength or more of the third frequency band, and the end of the third antenna elementis disposed to be spaced from the grounding plateby a distance of 0.01 wavelength or more of the third frequency band. Besides, the third antenna element may be made resonant at a fourth frequency band higher than the third frequency band, and a matching circuit to perform matching for the third frequency band may be provided.