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Near-field measurements and dual-tuned matching of two CDRA versions for combined 1H/23Na 7T-MRI

First near-field measurement results of two different congeneric dual resonant antennas (CDRAs) are presented in this paper. Each CDRA generates a half-wavelength current distribution at two desired resonance frequencies tailored to the magnetic resonance frequency of 1H- and 23Na-nuclei for 7 Tesla magnetic resonance imaging (MRI). Furthermore, the dual-tuned matching and feeding networks for these antenna types are discussed and shown in this paper as well. The presented CDRAs are based on composite right/left-handed (CRLH) transmission lines terminated with open or short circuits providing two different current and field distributions between both CDRA versions.