Abstract
This paper presents the design of a planar, low-profile, high-gain, wide-gain-bandwidth metasurface antenna with a multiple feeding structure. The antenna structure consists of a 5×5 array of square patch metasurface and a planar feeding structure, both of which are patterned on a high-permittivity, electrically thin, GaAs substrate. The metasurface is etched on the top side of the substrate, while the feeding structure, which is a wideband, leaky-wave, center-fed open-ended slotline, is printed on the bottom side of the substrate. The antenna showed maximum broadside gain of 15.5 dBi, radiation efficiency of 73%, and a 3-dB-gain bandwidth of more than 17.3% (0.342–0.408 THz).
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