A Flat Dual-Polarized Millimeter-Wave Luneburg Lens Antenna Using Transformation Optics with Reduced Anisotropy and Impedance Mismatch

TL;DR

This paper presents a compact, wideband dual-polarized Luneburg lens antenna using transformation optics to reduce anisotropy and impedance mismatch, enabling broad beam scanning for advanced wireless and radar applications.

Contribution

It introduces a novel flattened Luneburg lens design with reduced anisotropy and improved impedance matching, employing a metasurface phased array as feed for enhanced performance.

Findings

Achieved wideband 2D beam scanning with high gain.

Reduced anisotropy and reflection in the lens design.

Demonstrated potential for B5G and radar sensing applications.

Abstract

In this paper, a compact wideband dual-polarized Luneburg lens antenna (LLA) with reduced anisotropy and improved impedance matching is proposed in Ka band with a wide 2D beamscanning capability. Based on transformation optics, the spherical Luneburg lens is compressed into a cylindrical one, while the merits of high gain, broad band, wide scanning, and free polarization are preserved. A trigonometric function is employed to the material property of the flattened Luneburg lens with reduced anisotropy, thus effectively alleviates the strong reflection, the high sidelobes and back radiation with a free cost on the antenna weight and volume. Furthermore, a light thin wideband 7-by-1 metasurface phased array is studied as the primary feed for the LLA. The proposed metantenna, shorted for metamaterial-based antenna, has a high potential for B5G, future wireless communication and radar sensing as an onboard system.