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. 26, 1997
Filed:
Apr. 25, 1995
Ace Antenna Corporation, Kyunggi-do, KR;
Abstract
An capacitive coupled extendable antenna for cordless telephones and for portable cellular telephones is disclosed. The antenna is operated, in its extended state, as the equivalent of a half-wave dipole antenna due to capacity capacitive coupling between the quarter-wave helical antenna element and the quarter-wave whip antenna element and compensates, in its retracted state, the deficient capacity component of the helical antenna element owing to capacity capacitive coupling between the metal sleeve and the helical antenna element. The antenna also improves the efficiency of the whip antenna element as well as the efficiency of the helical antenna element by coupling the metal sleeve to a tube under the condition that the whip antenna element is fully inserted into the tube.