天线(收音机)
计算机科学
扩频
定向天线
电子工程
信号(编程语言)
光谱密度
噪音(视频)
微波食品加热
光谱(功能分析)
拓扑(电路)
电信
物理
电气工程
工程类
频道(广播)
人工智能
量子力学
图像(数学)
程序设计语言
作者
Morteza Nadi,A. Cheldavi
标识
DOI:10.1109/lawp.2023.3347468
摘要
In cellular communication, several modulations have been proposed to ensure robust and secure communication, spread spectrum being one. This paper pursuits a new secure and cost-effective communication system by leveraging time modulated metasurface antennas implementing the well-known concept spread spectrum. Recently, embedding and exploiting time-varying characteristics in electromagnetic devices can result in unique features. These features make it possible for antennas to be used for spread signal. For this purpose, we propose a time-modulated metasurface antenna operating within the microwave regime, where the meta-radiators are time-modulated. Temporal changes in meta-radiators expand the spectrum of the radiation signal of the antenna, similar to a noise-like spectrum with power spectral density very close to zero. In the same way as the spread spectrum technique, carrier signals are spread when the temporal changes are biased by pseudo-random. The proposed system is theoretically and experimentally analyzed using a time-modulated metasurface antenna with $16 \times 4$ meta-radiators. Our results have led to the emergence of a new class of antennas for secure communication in the microwave and cellular regimes, and it opens up a whole new world for research in this area.
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