Ultra-Long-Range Bessel Beams via Leaky Waves with Mitigated Open Stopband

TL;DR

This paper introduces an OSB mitigation technique to significantly extend the nondiffractive range of Bessel beams generated by leaky-wave antennas, enabling long-distance energy focusing in microwave/millimeter-wave applications.

Contribution

The work presents a novel OSB mitigation method that extends the nondiffractive range of Bessel beams from leaky-wave antennas, achieving a 25-meter range at 30 GHz.

Findings

Achieved a nondiffractive range of approximately 25 meters.

Demonstrated the effectiveness of OSB mitigation through simulations.

Compared performance with non-mitigated structures, showing significant improvement.

Abstract

Open stop-band (OSB) mitigation techniques are commonly used to improve the far-field radiating properties of leakywave antennas based on periodic structures. Recently, leaky waves have been proposed to focus energy in the near field through Bessel beams. However, the focusing character of Bessel beams is notably limited to a maximum distance known as the nondiffractive range. In this work, an OSB mitigation technique is originally exploited to significantly extend the nondiffractive range of a Bessel beam generated by a leaky-wave launcher in the microwave/millimeter-wave range. A comprehensive analysis of this device is presented, comparing the performance of the proposed launcher with the typical structure of a leaky-wave Bessel-beam launcher where the OSB is not suppressed. Theoretical results corroborated by full-wave simulations demonstrate that the proposed device, designed around 30 GHz, achieves an impressive nondiffractive range of approximately 25 m, which corresponds to 2500 vacuum wavelengths and to 50 times its aperture diameter of 50 cm. These results look particularly attractive for, e.g., near-field communications and wireless power transfer applications, where focusing energy in narrow spots and over large distances is a key factor.