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With the continuous advancement of wireless mobile communication technologies, user demand for high−quality communication services is growing significantly. As distance increases, the signal weakens at the cell edge, and the issue of insufficient base station coverage in these areas becomes a key factor constraining communication quality. Consequently, enhancing the performance of cell−edge users has become a major research focus in the field of wireless communications. Addressing this challenge, this study proposes utilizing reconfigurable intelligent surface (RIS) technology to achieve near−field focusing in the 3.5 GHz band to enhance cell−edge coverage. The near−field focusing effect of the electromagnetic superstructure was verified through both theoretical calculation and full−wave electromagnetic simulation. The analysis results indicated that RIS can achieve near−field focusing of electromagnetic waves by precisely controlling the phase of the electromagnetic waves. Field trial measurement in outdoor environments using a constructed RIS proof−of−concept prototype measured signal strength at various positions within the near−field region, validating the RIS's near−field focusing capability. System performance tests were conducted to evaluate the signal enhancement based on RIS near−field focusing, combined with a commercial base station antenna. Experimental results demonstrate that the intelligent metasurface exhibits excellent coverage enhancement effects in near−field focusing and can improve communication quality in the edge regions of base stations.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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