Abstract
In this paper, it is proposed the use of ultra-thin reflectarrays in some emerging scenarios in the new mm-wave cellular networks such as 5G, Beyond-5G (B5G), and future 6G. To that purpose, two dual-linear polarization reflectarrays are developed to provide coverages in different scenarios at the mm-waves band. Working at 28 GHz, reflectarray designs adapt the radiated field to the coverage area specified in each scenario, through an ultra-thin surface composed of simple cells. To evaluate the antenna performance, two reflectarray prototypes identical in size are manufactured and tested achieving a good trade-off between the performance and the low-cost, low losses and, low-profile characteristics of the antenna. This work demonstrates the good performance of simple topology reflectarrays, being an interesting antenna candidate in the upcoming wireless networks.
Highlights
The future mobile generations are expected to merge a wide variety of communications systems, offering a considerable improvement in performance in comparison with previous generations
Since the probe is in the near-field of the reflectarray, the far field is obtained through an NF-FF transformation using the software SNIFT from TICRA [42]
According to the obtained compliance figures, these effects do not have a significant impact on the antenna performance. These results demonstrate that the reflectarray concentrates most of the power within the coverage area, decreasing rapidly the field outside it
Summary
The future mobile generations are expected to merge a wide variety of communications systems, offering a considerable improvement in performance in comparison with previous generations. Phased arrays are able to generate narrow multi-beams [10], beam scanning [11], [12], and shaped patterns [13] This type of antenna requires significant improvements to achieve the performance goals in mm-wave frequency band. Apart from the above-mentioned types, Spatial Feed Arrays (SFA) are a low-cost and low-profile solution able to generate high gain beams with reconfigurable capabilities as well as shaped patterns Within this group, transmitarrays [19], [20] or metasurfaces [21], [22] can be mentioned due to their performances in several applications such as space communications [23], [24]. The prototype performances are compared to published reflectarray solutions
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