FDTD computational study of nanoplasmonic guiding structures for non-paraxial spatial solitons

Abstract

5. CONCLUSION A new very practical millimeter-wave transition for joining an RWG with the first layer SIW of a two layer LTCC has been proposed. It addresses both the shrinkage tolerances typically seen with this material as well as the avoidance of a second layer excitation. The LTCC tan d and er have been determined through a LINE and THRU measurement to distinguish the transition loss from the actual transmission line loss. These novel purely intrasubstrate experiments further confirm the strong dispersion of the LTCC. Simulations, with and without a varying gap, as well as the measurements on the fabricated back-to-back transition prove our concept. Fabricated LTCC circuits have been analyzed optically and even exceeded the total estimated shrinkage range. However, the transition shows good insertion loss <0.7 dB and a good matching with RL < 10 dB in the envisaged band. These results allow recommending this transition for two layer LTCC SIW projects up to an approximate circuit length of 12 kg in comparable environments.