A 3-D-Printed Wideband Circularly Polarized Parallel-Plate Luneburg Lens Antenna

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Abstract
This paper presents a 3D-Printed wideband parallel-plate circularly polarized Luneburg Lens antenna. The proposed structure of dielectric posts truncated by two metallic parallel plates serves not only as a Luneburg Lens, but also as a wideband linear-to-circular polarizer. The permittivity variation of the Luneburg Lens is realized by positioning dielectric posts with various radius (r) based on the optics theory and the effective medium theory (EMT). On the other hand, the desired circular polarization is realized by exciting two orthogonal propagating modes with different phase constants thanks to the integrated parallel plates. To verify our concept, a prototype was fabricated using 3D-Printing technology. Based on the measurement results, the proposed antenna achieves an overlapped bandwidth of 43% (21 GHz ’ 32.5 GHz) in terms of the reflection coefficients lower than -10 dB and the axial ratios smaller than 3 dB. Good agreement between simulation and measurement is obtained.
Funding Information
  • Singapore National Research Foundation National Additive Manufacturing Innovation Cluster (2016231)
  • Natural Science Foundation of Jiangsu Province, China (BK20191184)

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