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:
Jun. 12, 2001
Filed:
Dec. 10, 1999
Applicant:
Inventors:
Kiyoshi Egawa, Yokosuka, JP;
Masazumi Yamazaki, Yokosuka, JP;
Yoshio Koyanagi, Ebina, JP;
Hidehiro Yanagibashi, Yokohama, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01Q 1/24 ;
U.S. Cl.
CPC ...
H01Q 1/24 ;
Abstract
In a state that a whip antenna is contained in a housing of a cellular phone, a minute space is formed between a feeding spring and an attaching member conductive to a helical antenna base portion, so as to generate electrostatic capacitance, which is equivalent to the impedance characteristic of a mono-pole antenna. Then, electrostatic capacitance and a coil portion of a helical antenna constitute an LC series resonance circuit so as to improve the wide band of the helical antenna.