Patent ID: 7986142

Claim:
An apparatus configured to control an antenna arrangement in a magnetic resonance apparatus, said antenna arrangement having a cylindrical shape and having two feed points at which two partial signals are respectively fed to the antenna arrangement, said two feed points being located on a cross-section of the antenna arrangement having a center point, a first of the feed points forming a first angle with the center point relative to a horizontal axis of the cross-section and a second of the feed points forming a second angle, that is different from the first angle, with the center point of the horizontal axis, said apparatus comprising: a signal splitting device having two outputs and an input, said signal splitting device receiving a radio-frequency magnetic resonance signal at said input and dividing said radio-frequency magnetic resonance signal received at said input into two partial signals of equal amplitude, said two partial signals being respectively emitted at said two outputs of said signal splitting device; each of said two outputs of said signal splitting device being connected with precisely one of said two feed points of said antenna arrangement; said first and second angles being selected in order to set an elliptical polarization of said antenna arrangement with a predetermined ellipse position in space; a phase adjustment device connected between precisely one of said outputs of said signal splitting device and the feed point of the antenna arrangement connected thereto, said phase adjustment device setting a phase difference between said two partial signals that sets a predetermined semi-axis ratio for said elliptical polarization; and said first of said feed points being located at an angle of 202.5°+−10° relative to said horizontal axis, and said second of said feed points being located at an angle of 292.5°+−10° relative to said horizontal axis.