Influence of loop array geometry on near field transmit properties at 300 MHz

We present numerical investigation for a set of loop array geometry/load configurations obtained by RF circuit and frequency domain 3-D EM co-simulation. This is a very powerful and fast method for array coil investigation, since one multi-port 3-D EM simulation, which can be calculated in a reasonable time, is sufficient for obtaining the array transmit properties with several tuning/feeding/decoupling conditions. For circular polarization mode excitation, and ideal array design conditions, the 2-D and 3-D near-field transmit properties vary little between non-overlap, contiguous and overlap array configurations, if the separation between the array and the load is more than 20 mm, despite significant differences in the entire S-parameter matrices.