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:
May. 29, 2001
Filed:
Jun. 10, 1999
Jeong Kun Oh, Kyunggi-do, KR;
Kyung Min Lee, Kyunggi-do, KR;
Duk Jae Park, Incheon-shi, KR;
Choong Ki Cho, Incheon-shi, KR;
Jung Mi Park, Incheon-shi, KR;
ACE Technology, Kyunggi-Do, KR;
Abstract
Dual band retractable antenna system with capacitive coupling includes a helical antenna for operating at stand-by mode, the helical having ¼ wavelength; a whip, which penetrates the helical, for operating at busy mode, the whip having ¼ wavelength; a stopper for catching the whip when the antenna is extended out; a sleeve mounted to one end of the helical, for operating as a feed point when the whip is extended out; a capacitive coupling arrangement placed between the helical and the sleeve, for capacitively coupling the helical to the sleeve; and a matching circuit connected between the sleeve and the antenna system, so that the antenna system operates for both frequency bands.