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:
Jul. 15, 2003
Filed:
Mar. 31, 2000
Veli-Pekka Ketonen, Irving, TX (US);
Nokia Corporation, Espoo, FI;
Abstract
A method and apparatus for providing an antenna condition signal and a feeder cable condition signal in a base station having an antenna coupled to a cabinet by an antenna feeder cable. Two directional couplers are configured to detect forward and reflected signals to and from the antenna. Power detectors are coupled to the RF couplers, and are configured to provide forward and reflected power signals. A first differential amplifier provides a detector tuning signal proportional to the difference between the forward and reflected power signals. A second differential amplifier provides a detector tuning signal proportional to the difference between the forward and a reference voltage. Each differential amplifier tunes a voltage controlled oscillator (VCO). The output of the VCOs is coupled to the feeder cable. A phase locked loop at the cabinet is coupled to the feeder cable and provides a recovery tuning signal which tracks the tuning signals to the differential amplifiers.