Planar, circular RF antenna for open MR systems
AssigneeSiemens Aktiengesellschaft
InventorsJuergen Nistler, Wolfgang Renz, Markus Vester
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Abstract
A circular, planar radio-frequency antenna for open MR devices has two spaced systems composed of planar conductors arranged on a carrier plate for currents that cross one another and that are capacitively shortened by tuning capacitors applied to ground at at least one end for tuning to the desired resonant frequency. A planar metal layer is arranged on each carrier plate, the two currents that are in turn phase-offset by 90° being supplied into the layer offset by 90°. Tuning capacitors are arranged at the feed point and at the side opposite thereto.
Claims6
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 90° phase-offset currents respectively supplied to said planar metal layer at respective feed points separated by an angle of 90°, 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.
Dependencies are inferred from the claim text.