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We propose and experimentally demonstrate a broadband illusion device--"electromagnetic gateway" at microwave frequencies. The device is first realized using crossed split-ring resonator and wire unit cells, which can provide the desirable double-negative parameters through fine geometrical designs. Taking into account the complexities in practical realization, we then simplify the original design by using only half of the unit cells. Both simulation and experimental results verify the good abilities of the simplified gateway device in broadband in microwave frequencies. [ABSTRACT FROM AUTHOR]

We propose a broadband slow-wave system based on metallic graded grating structures of subwavelength thickness. A metal wire is used to excite the slow waves propagating along the gratings. The analysis and full-wave simulations show that the electromagnetic waves could be stopped at designed positions under different frequencies. Experiments are conducted in the microwave frequencies to verify the proposed system. The measured results show very good agreements to the full-wave simulations. We have further modeled a broadband slow-wave system of subwavelength thickness in the terahertz (THz) frequencies to demonstrate its validity. [ABSTRACT FROM AUTHOR]