Dipole Antenna Without Ceramic Substrate and Still Low SAR: The Fractionated Dipole Antenna.

Alexander Raaijmakers¹, Ingmar Voogt¹, Dennis W. J. Klomp¹, Peter R. Luijten¹, Nico van den Berg¹

RF coil array elements for body imaging at ultra-high field strengths need to be designed as antennas. An example of such a design is the single-side adapted dipole antenna (SiSiAD). Its drawback: it is heavy. In this study, we present another type of array element that has been designed according to radiative principles: the fractionated dipole antenna. It consists of a 30 cm dipole where the legs are split into 3 segments, interconnected by 20-50 nH inductors. Simulations and measurements show that the fractionated dipole antenna has similar or better B₁⁺/SAR performance than the SiSiAD, while being lighter and cheaper.