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:
Dec. 23, 2003
Filed:
Apr. 05, 2002
Applicant:
Inventor:
Tsutomu Mitsui, Yokohama, JP;
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01Q 1/112 ;
U.S. Cl.
CPC ...
H01Q 1/112 ;
Abstract
A planar inverted F antenna with stable radiation characteristics, which is not vulnerable to ambient influence, having, an insulator, a radiation device formed on one surface of the insulator and a grounding plate formed on the other surface thereof. A coaxial cable has a central conductor electrically connected to the radiation device and an outer conductor electrically connected to the grounding plate at two points spaced from each other by approximately a quarter of the wavelength of current flowing through the outer conductor. If leakage current flows along the outer conductor, the leakage current is negated by an inverse-phase current flowing through the grounding plate.