Journal
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Volume 62, Issue 6, Pages 3212-3221Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2014.2310193
Keywords
Complementary split-ring resonator (SRR); metamaterials; negative index (NI); transmission lines; waveguides
Funding
- AFOSR YIP [FA9550-11-1-0009]
- NSF CAREER [ECCS-0953311]
- DOE [DE-FG02-04ER41321]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [0953311] Funding Source: National Science Foundation
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A negative-index metawaveguide (NIMW) comprised of stacks of planar metal sheets loaded with periodic split-ring resonator apertures is modeled using a transmission-line (TL) analysis, and analyzed in detail. The proposed model provides a useful tool to extract the wave impedance and effective homogenized parameters of the metamaterial, ideal for design and optimization purposes. The dominant mode of the NIMW is transverse-magnetic, with a large longitudinal component of the electric field that enables its strong interaction with an electron beam and opens new opportunities for microwave generation and radiation detection. The inherent bi-anisotropy of its loaded inclusions is also examined within our TL theoretical framework, and a solution design to suppress its effect is presented. Finally, since the proposed geometry is shown to support an additional transverse-electromagnetic mode due to strong spatial dispersion, proper excitation of the NIMW is discussed and simulated.
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