Abstract
A dual-band dual-linear polarization reflectarray configuration is developed for future 5G cellular applications. A single layer unit cell including two pairs of miniaturized fractal patches is designed to operate at two distinct frequencies within the Ka-band (27/32 GHz), in a dual-polarization mode. An in-depth analysis of the unit cell behavior is carried out, to demonstrate the total independence between the designed frequency bands and polarizations. The proposed configuration offers a very simply and thin structure, small unit cell sizes, and low losses, while leading to an independent optimization of the phase at each frequency and polarization. A dual-band/dual-polarized reflectarray prototype is designed and tested, thus demonstrating the unit cell flexibility to offer arbitrary beam directions/shapes at each frequency, for both polarizations.
Highlights
Currently, the international telecommunication scientific community is focused on the development of the enabling technologies for generation 5G communication systems. 5G wireless communication networks are expected to meet the growing demand for higher data rates (i.e. 1-10 Gbps), lower network latencies, and better energy efficiency [1]
UNIT CELL LAYOUT AND DESIGN The proposed dual-band/dual-polarized reflectarray cell is composed by two pairs of miniaturized patches printed on the same substrate layer (Fig. 1)
DESIGN #1 A 3 × 15-reflectarray prototype illuminated by a normally incident plane wave is synthesized to demonstrate the high versatility of the proposed unit cell in achieving arbitrary and independent beam directions and/or shapes at each frequency and each polarization
Summary
The international telecommunication scientific community is focused on the development of the enabling technologies for generation 5G communication systems. 5G wireless communication networks are expected to meet the growing demand for higher data rates (i.e. 1-10 Gbps), lower network latencies, and better energy efficiency [1]. 5G wireless communication networks are expected to meet the growing demand for higher data rates (i.e. 1-10 Gbps), lower network latencies, and better energy efficiency [1] To address these demands, 5G systems will use millimeter wave (mmw) frequencies, which represent one of the key enabling technologies in the implementation of 5G networks. Reflectarrays can provide very high efficiencies, due to the adopted spatial feeding approach [7] They offer several reconfiguration capabilities, such as beam-steering [7], [13]–[17], multi-beam radiation patterns [7], [13], multi-band functions and/or polarization diversity [19]–[23]. As a proof of concept, the designed unit cell is adopted to synthesize a reflectarray having arbitrary beam directions at each frequency and polarization. As a matter of the fact, the implementation of compact antennas offering multi-band operation and polarization diversity could be very useful to increase 5G network capacity [1]–[3], [23]
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