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. 29, 2006
Filed:
Mar. 22, 2004
Zlatoljub Milosavljevic, Oulu, FI;
Zlatoljub Milosavljevic, Oulu, FI;
LK Products Oy, Kempele, FI;
Abstract
An adjustable multi-band planar antenna especially applicable in mobile terminals. In the structure of the antenna, advantageously on a surface of a dielectric part, there is placed a conductive element () having a significant electromagnetic coupling to the radiating plane (). The arrangement further comprises a filter () and a switch (SW) so that the parasitic conductive element at issue can be connected through the filter to a terminal element (TE) connected to the ground plane. That terminal element is pure short-circuit or a reactive element. An antenna's operation band, which is desired to be displaced, situates on pass band of the filter, and another operation band, which is desired not to be effected, situates in stop band of the filter. Controlling the switch causes the electric length of the antenna's part corresponding for example the upper operation band to change measured from the short-circuit point, in which case also the resonance frequency changes and the band is displaced. Only one operation band of the antenna is affected because on the other operation bands a high impedance is 'seen' from the parasitic element towards the ground, although the switch is closed.