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One-dimensional (1D) subwavelength corrugated metal structures has beendescribed to support spoof surface plasmon polaritons (SPPs). Here wedemonstrate that a modulated 1D subwavelength corrugated metal structure canconvert spoof SPPs to propagating waves. The structure is fed at the centerthrough a slit with a connected waveguide on the input side. The subwavelengthcorrugated metal structure on the output surface is regarded as metasurface andmodulated periodically to realize the leaky-wave radiation at the broadside.The surface impedance of the corrugated metal structure is modulated by usingcosine function and triangle-wave function, respectively, to reach theradiation effect. Full wave simulations and measuremental results are presentedto validate the proposed design.

Leaky-Wave Radiations by Modulating Surface Impedance on Subwavelength Corrugated Metal Structures