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Low-profile planar lens with multilevel FSS for directivity enhancement

Abstract:

An array of apertures or horn antennas are commonly used to obtain high directivity and gain, at the expense of increasing the fabrication complexity. In this paper a new approach is presented based on the use of frequency selective surfaces (FSS). These structures are commonly used to improve the performance of planar antennas within a certain frequency band. This paper shows how a FSS can be also used as a planar lens to increase the directivity of a single open waveguide keeping the low-profile and the ease of manufacturing of this kind of apertures. The proposed FSS is a multilevel metallic hole array (MHA) working at 8 GHz. Results show an increment of the maximum gain of 8 dBi with regard to a single open waveguide, with a small increment of the antenna's height.