Add-on RF shimming devices, including phase shifters, could provide additional degrees of freedom for RF transmit chains to improve field uniformity and reduce SAR. At the Larmor frequencies of MRI, however, the transmission line length for realizing large phase shifts becomes unrealistically long. We introduce a capacitor-loaded transmission line design to build a miniaturized microstrip line phase shifter for RF shimming at high fields. The fabricated phase shift boards had a miniaturized size of 3 x 4 cm2, exhibited a low loss of < 0.26 dB, and cost much less than those made from other materials.
This abstract and the presentation materials are available to members only; a login is required.