有源增益控制光束转向透射面

IF 3.5 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
Seyed Ehsan Hosseininejad;Amirmasood Bagheri;Fan Wang;Mohsen Khalily;Rahim Tafazolli
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引用次数: 0

摘要

工程电磁表面能够利用反常反射/传输增强所需方向的信号强度。然而,为了提高传统表面的增益,常见的解决方案是增大其孔径,而这种方法限制了大距离通信场景中有限空间的增益性能。本文提出了一种增益控制波束转向偏振工程透射面来应对这一挑战。为了实现这一功能,本文引入了一个与晶体管和移相器适当集成的透射单元,该单元具有同时操纵相位、振幅(缩小和放大)和偏振的能力。然后,设计了一个超级单元,包括具有所需线性相位梯度的单元阵列,并使用 Floquet 方法对其进行了分析,以倾斜传输光束。最后,为了验证所提出的想法,我们设计、制造并验证了一个包括 $12\times 12$ 单元尺寸的表面。结果表明,在 5 GHz 频率下,假设尺寸不变,与空气孔径相比,最大增益为 25 dB,与被动孔径相比,最大增益为 11 dB。在增益提高的基础上,有源表面的孔径效率是无源表面的 12.58 倍。此外,表面增益可通过晶体管的放大级别进行重新配置,从而提供了改变增益的有效动态方法,而不是静态地调整孔径大小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Active Gain-Controlled Beam-Steering Transmissive Surface
Engineered electromagnetic surfaces enable enhancing the strength of a signal in the desired direction(s) using anomalous reflection/transmission. However, to boost the gain of the conventional surfaces, the common solution is to increase its aperture size where this method limits the gain performance for limited space in scenarios for large-distance communication. This paper proposes a gain-controlled beam-steering polarization-engineered transmissive surface to tackle this challenge. To implement such a functionality, a transmissive unit cell properly integrated with transistors and phase shifters is introduced with the ability of simultaneous manipulation of phase, amplitude (reduction and amplification), and polarization. Then, a supercell including the array of unit cells with desired linear phase gradient is designed and analyzed using Floquet approach to tilt the transmitted beam. Finally, to verify the proposed idea, a surface including $12\times 12$ unit cells is designed, fabricated and verified. It is demonstrated that a maximum gain of 25 dB compared to air aperture and 11 dB compared to the passive one are achieved by assuming a constant size at 5 GHz. Based on this gain improvement, the active surface’s aperture efficiency is 12.58 times greater than that of the passive surface. Moreover, the surface gain can be reconfigured by the amplification level of the transistors, providing efficient dynamic way for changing the gain instead of the static resizing of aperture.
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来源期刊
CiteScore
6.50
自引率
12.50%
发文量
90
审稿时长
8 weeks
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