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. 20, 1991
Filed:
Mar. 06, 1990
William J Liimatainen, Palatine, IL (US);
Kevin Thill, Glendale Heights, IL (US);
Other;
Abstract
An planar antenna for use with a cellular telephone has a dielectric substrate with conductive coatings on its two major surfaces. A coaxial cable extends through a central aperture in the substrate with a shield of the cable connected to coating on one surface and a center conductor of the cable connected to coating on the other substrate surface. A number of shunts extend through the substrate electrically connecting the coatings on the two surfaces at points along a line that runs through the central aperture. Another shunt extends through the substrate electrically connecting the coatings on the two surfaces at a point which is not along the line of the other shunts. The position of the last shunt is non-uniformly spaced with respect to the other shunts and is selected to alter an electrical characteristic of the antenna to a desired value.