Transmission antenna apparatus and magnetic resonance imaging device
The transmission antenna apparatus is configured for emitting transmission magnetic fields in magnetic resonance imaging devices and includes one or more flat antennas. A magnetic resonance imaging device includes such a transmission antenna apparatus.
1. A transmission antenna apparatus configured for emitting transmission magnetic fields in magnetic resonance imaging devices, the transmission antenna apparatus comprising:
at least a first flat loop antenna, a second flat loop antenna, and a third flat loop antenna, the first flat loop antenna being spaced apart from and non-overlapping with the third flat loop antenna, at least a first conductor piece of the first flat loop antenna and a second conductor piece of the third flat loop antenna extending at least in part within the second flat loop antenna in planar directions of extent of the second flat loop antenna; and
feed apparatuses configured for feeding the first conductor piece of the first flat loop antenna in an opposite direction to the second conductor piece of the third flat loop antenna.
2. The transmission antenna apparatus of claim 1 , wherein at least one of the first flat loop antenna, the second flat loop antenna, and the third flat loop antenna is configured as a planar antenna.
3. The transmission antenna apparatus of claim 1 , wherein at least one of the first flat loop antenna, the second flat loop antenna, and the third flat loop antenna is configured as a butterfly antenna.
4. The transmission antenna apparatus of claim 1 , further comprising a ground plane, a feed apparatus, or a combination thereof for feeding the first conductor piece and the second conductor piece,
wherein the first conductor piece, the second conductor piece, or the first conductor piece and the second conductor piece are connected to the ground plane, to the feed apparatus, or to the ground plane and the feed apparatus.
5. The transmission antenna apparatus of claim 1 , wherein at least one antenna of the first flat loop antenna, the second flat loop antenna, and the third flat loop antenna is configured as a butterfly antenna, and
wherein the loop of the second flat loop antenna surrounds a crossing point/contact point of the butterfly antenna in planar directions of extent of the loop.
6. The transmission antenna apparatus of claim 1 , wherein the first loop antenna, the second loop antenna, and the third loop antenna extend parallel to one another with planar directions of extent thereof.
7. The transmission antenna apparatus of claim 6 , wherein the first loop antenna, the second loop antenna, and the third loop antenna extend substantially coplanar to one another with the planar directions of extent thereof.
8. The transmission antenna apparatus of claim 1 , wherein the loop of the first loop antenna is disposed in the planar directions of extent of the loop of the second loop antenna on one side of the loop of the second loop antenna, and the loop of the third loop antenna is disposed in the direction of the planar directions of extent of the second loop antenna on the other side of the loop of the second loop antenna.
9. The transmission antenna apparatus of claim 1 , wherein the loops of the first loop antenna and of the second loop antenna, the loops of the third loop antenna and of the second loop antenna, or the loops of the first loop antenna and of the second loop antenna and the loops of the third loop antenna and of the second loop antenna overlap in directions of the planar directions of extent of the second loop antenna.
10. The transmission antenna apparatus of claim 1 , wherein at least the loops of the first loop antenna and the third loop antenna or at least the loops of at least the first loop antenna, the second loop antenna, and the third loop antenna have an identical geometry.
11. The transmission antenna apparatus of claim 1 , wherein at least the loops of two of the loop antennas comprise one or more common conductor sections.
12. The transmission antenna apparatus of claim 1 , wherein one or more loop antennas have a loop with a polygonal profile.
13. The transmission antenna apparatus of claim 12 , wherein the polygonal profile is a triangular profile.
14. The transmission antenna apparatus of claim 12 , wherein the polygonal profile is a rectangular profile.
15. A magnetic resonance imaging device comprising:
a transmission antenna apparatus configured for emitting transmission magnetic fields in magnetic resonance imaging devices, the transmission antenna apparatus comprising:
at least a first flat loop antenna, a second flat loop antenna, and a third flat loop antenna, the first flat loop antenna being spaced apart from and non-overlapping with the third flat loop antenna, at least a first conductor piece of the first flat loop antenna and a second conductor piece of the third flat loop antenna extending at least in part within the second flat loop antenna in planar directions of extent of the second flat loop antenna; and
feed apparatuses configured for feeding the first conductor piece of the first flat loop antenna in an opposite direction to the second conductor piece of the third flat loop antenna.
16. The magnetic resonance imaging device of claim 15 , wherein at least one antenna of the first flat loop antenna, the second flat loop antenna, and the third flat loop antenna is configured as a planar antenna.
17. The magnetic resonance imaging device of claim 15 , wherein at least one antenna of the first flat loop antenna, the second flat loop antenna, and the third flat loop antenna is configured as a butterfly antenna.