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:
Aug. 01, 2000
Filed:
May. 06, 1998
Tetsuya Saito, Saitama, JP;
NEC Corporation, Tokyo, JP;
Abstract
An antenna structure for a portable radio communication apparatus of the present invention includes a whip antenna and a helical antenna feed portion connected by capacitive coupling via an insulator. When the whip antenna is extended, the electric length can be adjusted on the basis of the amount of capacitive coupling between a straight portion and the helical antenna feed portion, i.e., without resorting to the adjustment of a helical antenna element. When the whip antenna is retracted, the straight portion is electrically isolated in order to allow the helical antenna element to operate alone. In this position, the helical antenna element is optimally adjusted in order to resonate in a desired frequency band.