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:
Mar. 13, 2001
Filed:
Jan. 28, 1999
Applicant:
Inventor:
Hiroshi Fujikawa, Tokyo, JP;
Assignee:
SMK Corporation, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01Q 1/24 ; H01Q 1/36 ;
U.S. Cl.
CPC ...
H01Q 1/24 ; H01Q 1/36 ;
Abstract
First and second helical antenna elements are connected in series with a radio signal. The first helical antenna element resonates at a first frequency as a ¼-wavelength antenna. The series combination of the first and second helical antenna elements resonates as a ¾ wavelength antenna at a second frequency respectively. The two frequencies differ by less than a factor of three. A retractable rod antenna shorts out one of the antenna elements in an extended position at which it is connected to the radio, and is disconnected from the radio in its retracted position. The rod antenna resonates as a ¼-wavelength antenna at the first frequency.