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Broadband Dual-CP Multistage Sequential Rotation Arrays With Independent Control of Polarizations Based on Dual-CP Magnetoelectric Dipole Elements | IEEE Journals & Magazine | IEEE Xplore

Broadband Dual-CP Multistage Sequential Rotation Arrays With Independent Control of Polarizations Based on Dual-CP Magnetoelectric Dipole Elements


Abstract:

In this article, broadband dual-circularly polarized (dual-CP) antenna arrays with independent control of polarizations are proposed and demonstrated at the K-band. By in...Show More

Abstract:

In this article, broadband dual-circularly polarized (dual-CP) antenna arrays with independent control of polarizations are proposed and demonstrated at the K-band. By introducing folded \Gamma -shaped end loadings and corner truncation, a dual-CP magnetoelectric dipole (ME-dipole) element with a compact footprint and a broad bandwidth of 22.5% is realized. Based on such element, a 2\times2 -element sequential rotation (SR) subarray is constructed. By employing a high dielectric constant substrate, a stacked array feeding configuration is devised by placing two sets of microstrip feeding circuits above and below the ground plane for independent dual-CP beamforming. Importantly, the feeding circuitry is fully confined within the area of the array elements without occupying any extra space. Furthermore, a 4\times4 -element array is synthesized for obtaining dual-CP radiated beams over a broad bandwidth with improved CP purity and port isolation via exploiting the double-stage SR feeding strategy. The fabricated array prototype experimentally achieves a 3-dB axial ratio bandwidth of wider than 28.5%, a 3-dB gain bandwidth of about 23.2%, as well as a −10 dB impedance bandwidth of greater than 50% within which the port isolation is higher than 15 dB. Moreover, the dual-CP beamforming is also showcased by a second array example that generates an LHCP pencil beam and an RHCP vortex beam pointing at distinct directions, confirming the capability of independent control of polarization.
Published in: IEEE Transactions on Antennas and Propagation ( Volume: 72, Issue: 4, April 2024)
Page(s): 3017 - 3032
Date of Publication: 14 February 2024

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I. Introduction

With the development of wireless technologies, such as satellite navigation and communications [1], millimeter wave (mm-Wave) radars and imagers [2], as well as the fifth-generation (5G) mobile communications [3], the electrical properties of antennas have become increasingly important for ensuring well-rounded system performance. Compared with the linearly polarized (LP) antennas, the circularly polarized (CP) ones possess a variety of advantages, such as being less sensitive to alignment-induced polarization mismatch, more robust to multipath interference, and immune to the Faraday rotation effect that occurred in the ionosphere [4]. On the other hand, due to the growing demands for high-throughput and multifunctional wireless systems, polarization diversity has been widely utilized in the Tx/Rx modules [5]. Hence, high-performance antennas and arrays supporting dual-CP radiation have garnered a great amount of attention, particularly over the past decade [6].

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References

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