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:
Jan. 08, 2002
Filed:
Feb. 28, 2000
Applicant:
Inventors:
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01Q 1/900 ; H01Q 1/910 ;
U.S. Cl.
CPC ...
H01Q 1/900 ; H01Q 1/910 ;
Abstract
The antenna apparatus of the present invention places antenna element that transmits or receives electromagnetic waves on basic plate , places parasitic antenna elements to on basic plate evenly spaced concentrically centered on antenna element , places switch elements to and capacitances to in parallel between one end of each of antenna elements to and said basic plate and disconnects one of switch elements to and connects all the others. In this way, the present invention provides a small and high-gain antenna apparatus with directivity switching capability.