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:
Dec. 12, 2000
Filed:
Oct. 07, 1999
James Emanuel Teran, Chandler, AZ (US);
Archer David Munger, Mesa, AZ (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
A dual pattern antenna (FIG. 1, 20) functions as a bi-filar or quadrifilar helical antenna depending of the location of the feed element (FIG. 4, 120). When the feed element (120), within the hollow dielectric tube (FIG. 4, 140), is used to feed the antenna (20) at a distal end portion (FIG. 4, 142) the antenna functions as a bi-filar helical antenna and exhibits a relatively omnidirectional radiation pattern (FIG. 3, 70). When the feed element is used to feed the antenna at a proximal end portion (FIG. 4, 141), the antenna (20) functions as a quadrifilar helical antenna having a radiation pattern which exhibits desirable gain properties in the area above the antenna (FIG. 4, 40). The use of capacitive coupling allows the feed element (120) to slide within the hollow dielectric tube (140) so that the pattern of the antenna can be quickly changed, thus making the antenna well-suited for portable communications devices such as satellite cellular telephones.