Experimental Comparison of Wireless Near-Field Links based on Gaussian and Bessel Beams

Gaussian beams are considered excellent candidates for wireless near-field links thanks to their well-known focusing properties. The latter, however, are maintained only up to the Rayleigh range because of diffraction. In this context, the limited-diffraction and self-healing properties of Bessel beams gained increasing interest in wireless data links and power transfer applications. Here, we provide for the first time an experimental comparison of the performance of Bessel beams and Gaussian beams for realizing a wireless link in the sub-terahertz range, specifically in the W-band. Bessel beams are generated through all-metal spline horns, whereas Gaussian beams are generated through commercial WR10 horns. Measurements, even in presence of obstacles across the link and a ground plane in proximity, reveal the superior performance of Bessel beams.