  One-dimensional (1D) subwavelength corrugated metal structures has been
described to support spoof surface plasmon polaritons (SPPs). Here we
demonstrate that a modulated 1D subwavelength corrugated metal structure can
convert spoof SPPs to propagating waves. The structure is fed at the center
through a slit with a connected waveguide on the input side. The subwavelength
corrugated metal structure on the output surface is regarded as metasurface and
modulated periodically to realize the leaky-wave radiation at the broadside.
The surface impedance of the corrugated metal structure is modulated by using
cosine function and triangle-wave function, respectively, to reach the
radiation effect. Full wave simulations and measuremental results are presented
to validate the proposed design.
