In order to fulfill the exponential increase in the demand of high-speed wireless links, future XG wireless networks will be developed at higher carrier signal frequencies, reaching the hundreds of gigahertz. In this contribution, a leaky-wavefed HDPE lens antenna working at G-band which can be useful for future XG communications is presented. The proposed lens design enables the generation of up to 40 beams, with gains higher than 30 dB. Analytical tools have been applied to optimize the lens aperture efficiency, validating the results via full-wave simulations. The reached aperture efficiency for the broadside beam is higher than 80% over a 44% relative bandwidth. The measurement results for a fabricated prototype show excellent agreement with the simulated performance.

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Fabry-Perot antennas (FPA) achieve high broadside directivity due to the simultaneous excitation of a pair of nearly degenerate TE/TM leaky-wave modes using a partially-reflecting surface on top of a ground plane. This partially-reflecting surface can be obtained using a dielectric superstrate or via a capacitive or inductive metasurface (MTS). By using an equivalence between the conventional dielectric superstrate and the MTS-based structures in terms of the dominant TE/TM modes, we show that the use of inductive grid MTSs leads to a directivity enhancement. A higher roll-of in the radiation patterns is achieved as a result of the intrinsic suppression of the spurious leaky wave mode. This suppression is mathematically demonstrated and validated with full-wave simulations. The achieved improvement in more than 1 dB for inductive strip grid based MTS with respect to dielectric based super-layers, for the same frequency band of 2.5%, is verified with measurements. Two prototypes, with the dielectric superlayer and inductive strip grid based MTS, have been fabricated and measured supporting the claim of this work.

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