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Frontiers of Information Technology & Electronic Engineering
ISSN 2095-9184 (print), ISSN 2095-9230 (online)
2020 Vol.21 No.3 P.377-383
A high-precision terahertz retrodirective antenna array with navigation signal at a different frequency
Abstract: Future communications will provide higher transmission rates and higher operating frequencies. In addition, agile beam tracking will be an inevitable trend in technology development. The terahertz retrodirective antenna array proposed and discussed in this paper can be a better solution for agile beam tracking. The array receives a 40-GHz navigation signal and accurately retransmits a 120-GHz beam in the direction of the arrival wave. Simulation results indicate that the proposed array with a stacked sandwich structure has realized the tracking of the received wave. The scanning radiation pattern shows that the array gain is 23.87 dB at 19.9° when the incident angle is 20° with a relative error of only 0.5%, meaning that there is a lateral error of only 8.7 m at a transmission distance of 5 km.
Key words: Terahertz, Retrodirective antenna array, Terahertz communications, Conjugate mixing
1北京理工大学毫米波与太赫兹技术北京市重点实验室，中国北京市，100081
2中国空间技术研究院西安分院空间微波技术重点实验室，中国西安市，710100
3电子科技大学电子科学与工程学院，中国成都市，611731
摘要：未来通信系统将工作于更高频率，并提供更高传输速率。频率提升将导致难以提供区域宽波束覆盖，因此灵活捷变的波束跟踪将成为技术发展的必然趋势。本文报道的太赫兹波束回溯天线阵列可为灵活捷变的波束跟踪提供良好解决方案。该天线阵列接收40 GHz的导频信号，回溯波束传输的信号是120 GHz。仿真结果表明文中所述具有三明治堆叠结构的天线阵列可成功实现入射波的回溯功能。天线辐射方向图显示该天线阵列在20°入射波条件下，其回溯波束在19.9°位置处，增益为23.87 dB，回溯方向相对误差仅为0.5%。这意味着在5 km传输距离下，水平误差仅为8.7 m。
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DOI:
10.1631/FITEE.1900581
CLC number:
TN821
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On-line Access:
2020-03-18
Received:
2019-10-24
Revision Accepted:
2020-02-17
Crosschecked:
2020-03-03