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. 04, 2008
Filed:
Nov. 20, 2002
Mads Sager, Roedovre, DK;
Jens Troelsen, Copenhagen SV, DK;
Mads Sager, Roedovre, DK;
Jens Troelsen, Copenhagen SV, DK;
Nokia Corporation, Espoo, FI;
Abstract
An antenna () includes a patch antenna element () capacitively coupled to a load patch (). A switch () connects the load patch () to one of one or more strip lines (), each of which has a different length. Each strip lines causes the load patch () to have a different impedance, with one causing a short circuit, one causing an open circuit, and one causing an impedance in between these extremes. Different impedances of the load patch () cause different frequencies of operation of the antenna patch () by virtue of the capacitive coupling therebetween. The antenna () is thereby tuneable to three separate frequencies. Other frequency bands are unaffected by virtue of the location of the load patch () relative to the antenna patch (). By allowing tuning by way of controlling the impedance of the load patch (), the antenna arrangement can be made smaller than a corresponding passive antenna operable at the same frequencies. By using an N throw switch, N strip lines of different lengths can be connected, each giving rise to a different operating frequency.