A Wide-Angle Broadband Converter: From Odd-Mode Spoof Surface Plasmon Polaritons to Spatial Waves

A wide-angle broadband converter from odd-mode spoof surface plasmon polaritons (SPPs) to spatial waves is proposed using spatially gradient Vivaldi-shaped flaring structure. We first show the dispersion, Eigen mode, and effective circuit topology of the designed SPP structure and show that it can s...

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Bibliographic Details
Published in:IEEE transactions on antennas and propagation 2019-12, Vol.67 (12), p.7425-7432
Main Authors: Zhang, Hao Chi, Wang, Qijie, Luo, Yu, Liu, Lin, He, Pei Hang, Lu, Jiayuan, Zhang, Le Peng, Xu, Jie, Liu, Liangliang, Gao, Fei, Cui, Tie Jun
Format: Article
Language:English
Subjects:
Broadband
Broadband antennas
Circuit design
Circuit topology
converter
Converters
Dielectric constant
Dispersion
Far fields
Impedance
Metals
odd mode
Polaritons
Propagation modes
spatial wave
surface plasmon polaritons (SPPs)
Topology
Wavelengths
wide angle
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Summary:A wide-angle broadband converter from odd-mode spoof surface plasmon polaritons (SPPs) to spatial waves is proposed using spatially gradient Vivaldi-shaped flaring structure. We first show the dispersion, Eigen mode, and effective circuit topology of the designed SPP structure and show that it can support a propagating odd mode. A conversion structure between odd-mode spoof SPPs and spatial mode has been designed to realize smooth impedance and wavenumber transition. Through the full-wave simulation method, we obtained the optimized geometric parameters, from which we fabricate the converter using the print circuit board technology. The measured results from both far field and near field show that the proposed structure has successfully excited odd-mode spoof SPPs coming from an extremely wide-angle spatial radiation. The allowed azimuthal and pitched angle ranges are larger than 72°.
ISSN:0018-926X
1558-2221
DOI:10.1109/TAP.2019.2935671