Patent ID: 6747453
Filing Date: 2004-06-08
Classification: H01Q

Abstract:
A circular, planar radio-frequency antenna for an open MR apparatus, comprising:a first carrier plate and a second carrier plate spaced from each other; each of said carrier plates having a planar metal layer disposed thereon forming a planar conductor for two 90Â° phase-offset currents respectively supplied to said planar metal layer at respective feed points separated by an angle of 90Â°, each of said planar metal layers having a periphery; and the planar metal layers on the respective first and second carrier plates each having a plurality of tuning capacitors connected thereto and connected to ground, with tuning capacitors at each planar metal layer being connected at the respective feed points and at points of said planar metal layer respectively opposite said feed points, and said tuning capacitors being connected at equally spaced points around said periphery.