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:
Sep. 08, 2009
Filed:
Aug. 15, 2005
Tero Ranta, Turku, FI;
Tero Ranta, Turku, FI;
Nokia Corporation, Espoo, FI;
Abstract
An impedance matching system may be used, for example, for impedance matching between a transmitter/receiver front-end and an antenna in a mobile communication device. In a tuneable impedance matching system according to the invention a tuneable impedance matching circuit () is used also as a measuring circuit for obtaining a value of a load impedance. A real part and an imaginary part of a load impedance () is calculated based on voltages measured on nodes of the tuneable impedance matching circuit and on known component values of the tuneable impedance matching circuit. Values for adjustable electrical components () of the tuneable impedance matching circuit are determined based on the obtained load impedance value and on an impedance matching condition.