Yong Pang1, Chunsheng Wang2,
Xiaoliang Zhang2,3
1Radiology and Biomedical imaging,
University of California San Francisco, San Francisco, CA , United States; 2Radiology
and Biomedical imaging, University of California San Francisco, San
Francisco, CA, United States; 3 UCSF/UC Berkeley Joint Graduate
Group in Bioengineering, San Francisco & Berkeley, CA, United States
An
8-element single-feed quadrature array is designed for 298 MHz using patch
antenna technique. Each element is built as a nearly square ring microstrip
antenna and is fed along the diagonal to generate a circularly polarized (CP)
magnetic field. Compared with linear coils, the SNR can be improved by 40% or
the transmission power can be reduced by half. Compared with conventional
quadrature coil, this structure is simple and easily built as array. FDTD
simulations demonstrate that the decoupling between elements are all better
than -35dB and the RF field is homogeneous with deep penetration and quadrature
behavior.