Patent ID: 8144072
Filing Date: 2012-03-27
Classification: H01Q

Abstract:
1. A multi-band antenna mounted on a display screen of a notebook computer for receiving and transmitting radio signals, the multi-band antenna comprising: an electrically insulative carrier board mounted on a top side of said display screen; a main antenna, said main antenna comprising a top metal strip disposed at a top side of said electrically insulative carrier board and a grounding metal strip arranged on said electrically insulative carrier board, said grounding metal strip having a top end portion connected to said top metal strip, a L-shaped body portion extended from said top end portion, said L-shaped body portion having a longitudinal axis and a transverse axis, a curved portion extended from a middle part of the longitudinal axis of said L-shaped body portion and a grounding portion extended from one end of said curved portion remote from said L-shaped body portion and connected to said display screen and grounded; an inverted L antenna arranged on said electrically insulative carrier board, said inverted L antenna having a transverse axis disposed at one lateral side relative to the transverse axis of said L-shaped body portion of said grounding metal strip and a longitudinal axis disposed in parallel to said top metal strip; a first capacitor electrically connected between the transverse axis of said inverted L antenna and the transverse axis of said L-shaped body portion of said grounding metal strip of said main antenna; a second capacitor electrically connected between a distal end of the transverse axis of the L-shaped body portion of said grounding metal strip of said main antenna and the transverse axis of said grounding portion of said grounding metal strip of said main antenna; and an antenna feed-in terminal located on a distal end of the transverse axis of said inverted L antenna; wherein a radio signal is inputted through said antenna feed-in terminal into said inverted L antenna and then transferred by said first capacitor to a distal end of the longitudinal axis of said L-shaped body portion of said grounding metal strip of said main antenna; said first capacitor and said second antenna provide an antenna matching function; the position of said first capacitor is vertically adjustable to match the multi-band antenna.