Abstract
A low-profile planar surface-wave antenna with metasurface is proposed for endfire radiation. The antenna has the advantages of low profile, high gain, and wide bandwidth of endfire radiation. The surface-wave structure is based on a substrate integrated waveguide (SIW) structure, which can be considered as a laterally-bounded conductor-backed coplanar waveguide (CPW) with a metasurface that is made of periodic staggered patches. The propagation properties are analyzed with a magnetic-field integral equation method. With the analysis, it is found that the structure supports an improper leaky mode and a proper mode that behaves as a surface-wave mode in lower frequency range. With the surface-wave mode, an endfire surface-wave antenna is designed. A prototype of the antenna is fabricated and measured. The measurement results show that the antenna provides a 3 dB gain bandwidth of 32%, with the gain varying from 12.3 to 15.3 dBi in the operation band from 9.6 o 13.6 GHz at a fixed direction close to endfire.
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