Journal
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Volume 67, Issue 12, Pages 7425-7432Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2019.2935671
Keywords
Dispersion; Impedance; Metals; Dielectric constant; Broadband antennas; Circuit topology; Broadband; converter; odd mode; spatial wave; surface plasmon polaritons (SPPs); wide angle
Funding
- National Natural Science Foundation of China [6871127, 61631007, 61571117, 61501112, 61501117, 61522106, 61731010, 61735010, 61722106, 61701107, 61701108, 61701246]
- National Key Research and Development Program of China [2017YFA0700200, 2017YFA0700201]
- Fundamental Research Funds for the Central Universities [22442018R30001]
- 111 Project [111-2-05]
- Singapore Ministry of Education Academic Research Fund TIER 1 [2017-T1-001-239 [RG91/17 (S)]]
- Singapore Ministry of Education Academic Research Fund TIER 2 [MOE 2018-T2-2-189 (S)]
- A*Star AME Programmatic Grant [A18A7b0058]
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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.
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