High frequency antenna for a nuclear magnetic resonance measuring apparatus

A high frequency antenna for an apparatus measuring the nuclear magnetic resonance of the nucleii of a body comprising:

• at least one antenna element formed of two conducting semi elements extending opposite each other along generatrices of a fictitious cylinder;
• means for radiating a high frequency magnetic field inside the fictitious cylinder wherein said means for radiating comprise each one of said two conducting semi elements associated with an adjustable tuning capacitor and a cylindrical metal casing, wherein said means for radiating are respectively fed in phase opposition with respect to each other by a high frequency electrical signal, which antenna further comprises a high frequency line section, whose length is substantially equal to half the wavelength of the high frequency wave corresponding to the signal, and which is connected by its ends to each of the conducting semi elements for frequency tuning the radiating means;
• means for simultaneously adjusting the adjustable tuning capacitors and thus forming frequency tuning means for the antenna element;
• and
• means for comparing a supply voltage in phase and amplitude with corresponding voltages developed in the antenna elements and for acting consequently on the frequency tuning and power adjustment means respectively.

A high frequency antenna for an apparatus measuring the nuclear magnetic resonance of the nucleii of a body comprising:

• at least one antenna element formed of two conducting semi elements extending opposite each other along generatrices of a fictitious cylinder;
• means for radiating a high frequency magnetic field inside the fictitious cylinder wherein said means for radiating comprise each one of said two conducting semi elements associated with an adjustable tuning capacitor and a cylindrical metal casing, wherein said means for radiating are respectively fed in phase opposition with respect to each other by a high frequency electrical signal, which antenna further comprises a high frequency line section, whose length is substantially equal to half the wavelength of the high frequency wave corresponding to the signal, and which is connected by its ends to each of the conducting semi elements for fequency tuning the radiating means;
• two and which is connected by its ends to each of the conducting semi elements for fequency tuning the radiating means;
• two antenna elements whose semi-elements are disposed at the intersection of the fictitious cylinder and of two perpendicular sections symmetrical with each other with respect to a plane passing through a small axis of an elliptical section, such section being orthogonal to the generatrices of the cylinder, and representing substantially a section of the body which is subjected to a examination;
• and
• means for comparing a supply voltage in phase and amplitude with corresponding voltages developed in the antenna elements and for acting consequently on the frequency tuning and power adjustment means respectively.