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Frontiers of Information Technology & Electronic Engineering
ISSN 2095-9184 (print), ISSN 2095-9230 (online)
2025 Vol.26 No.8 P.1501-1508
Three-dimensional-printed low-sidelobe dual-band dual-polarized antenna array for Ku-bandsatellite communications
Abstract: A 3D-printed dual-band dual-polarization gap waveguide (GWG) slot antenna array for Ku-band satellite communications (SATCOMs) is presented in this paper. Two stacked GWGs excite the quasi-TE420 and quasi-TE240 modes in the cavity respectively through orthogonal slots. An unequal power divider with a large power division ratio is proposed based on a ridge gap waveguide(RGW). Two power tapering distribution networks are realized for dual polarizations, and the sidelobe level (SLL) is suppressed. The antenna is fabricated in parts by direct metal laser sintering (DMLS), and the whole antenna is obtained by screw assembly. The measured impedance bandwidth well covers both the transmitting band (Tx, from 14 GHz to 14.5 GHz) and the receiving band (Rx, from 12.25 GHz to 12.75 GHz) required for Ku-band SATCOMs. Measurement results show that the maximum gain reaches 25.6 dBi, and the radiation efficiency of the dual-band is >72%.
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1信息光子学与光通信全国重点实验室，中国北京市，100876
2泛网无线通信教育部重点实验室，中国北京市，100876
3安全生产智能监控北京市重点实验室，中国北京市，100876
4北京邮电大学电子工程学院，中国北京市，100876
摘要：介绍了一种用于Ku波段卫星通信（SATCOM）的3D打印双频双极化间隙波导（GWG）缝隙阵列天线。两个堆叠的GWG通过正交槽分别激发腔内的准TE420和准TE240模式。基于脊间隙波导（RGW），提出一种具有大功率分配比的不等分功率分配器。实现了双极化功率锥形分布馈电网络，抑制了旁瓣电平（SLL）。天线通过直接金属激光烧结（DMLS）分层打印，整个天线通过螺钉组装在一起。测量的阻抗带宽覆盖了Ku波段SATCOM所需的发射频段（Tx，从14.0到14.5 GHz）和接收频段（Rx，从12.25到12.75 GHz）。测量结果显示，最大增益达到25.6 dBi，双频段的辐射效率超过72%。
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DOI:
10.1631/FITEE.2400709
CLC number:
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On-line Access:
2025-06-04
Received:
2024-08-13
Revision Accepted:
2024-12-22
Crosschecked:
2025-09-04