A dual-band dual-circularly polarized structure reused shared-aperture antenna with high aperture efficiency for satellite communications

IF 3 3区计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC Aeu-International Journal of Electronics and Communications Pub Date : 2024-07-20 DOI:10.1016/j.aeue.2024.155426

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Abstract

A novel S/Ka dual-band dual-circularly polarized (CP) shared-aperture antenna is proposed in this paper. In the Ka-band, the reflectarray adopts two distinct CP elements, both of which achieve 360° phase shift and linear phase response in the wideband. In the S-band, the radiation array adopts a 4 × 4 units cut-corner square patch to achieve CP performance. Additionally, a steerable beam is achieved through a phase shift feeding network. To effectively improve the antenna aperture utilization and efficiency, the S-band radiator is reused as a part of the Ka-band reflecting ground to realize the aperture-sharing. Experimental results demonstrate that the S-band operating bandwidth covers 2.35–2.7 GHz, achieving a peak gain of 18.6 dBic and an aperture efficiency of 89.2 %. Furthermore, the S-band enables ± 30° beam steering. In the Ka-band, the operating bandwidth covers 28–32 GHz, with a measured 2-dB axial ratio bandwidth is 10.3 %, a peak gain of 37.5 dBic, and an aperture efficiency of 48.1 %. Therefore, a dual-band dual-CP shared-aperture antenna with high aperture efficiency is realized. The antenna offers beam steering in the S-band and wideband capabilities in the Ka-band, making it a valuable candidate for satellite communication systems.

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用于卫星通信的高孔径效率双波段双圆极化结构重复使用共用孔径天线

本文提出了一种新型 S/Ka 双波段双圆极化（CP）共用孔径天线。在 Ka 波段，反射阵列采用了两个不同的 CP 元件，均可实现 360° 相移和宽带线性相位响应。在 S 波段，辐射阵列采用 4 × 4 单元切角方形贴片来实现 CP 性能。此外，还通过相移馈电网络实现了可转向波束。为了有效提高天线孔径的利用率和效率，S 波段辐射器被重新用作 Ka 波段反射地的一部分，以实现孔径共享。实验结果表明，S 波段工作带宽为 2.35-2.7 GHz，峰值增益为 18.6 dBic，孔径效率为 89.2%。此外，S 波段还能实现 ± 30° 的波束转向。在 Ka 波段，工作带宽为 28-32 GHz，测量的 2-dB 轴向比带宽为 10.3%，峰值增益为 37.5 dBic，孔径效率为 48.1%。因此，高孔径效率的双频双 CP 共孔径天线得以实现。该天线在 S 波段具有波束转向功能，在 Ka 波段具有宽带功能，是卫星通信系统的理想选择。

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来源期刊

Aeu-International Journal of Electronics and Communications 工程技术-电信学

CiteScore

6.90

自引率

18.80%

发文量

292

审稿时长

4.9 months

期刊介绍： AEÜ is an international scientific journal which publishes both original works and invited tutorials. The journal''s scope covers all aspects of theory and design of circuits, systems and devices for electronics, signal processing, and communication, including: signal and system theory, digital signal processing network theory and circuit design information theory, communication theory and techniques, modulation, source and channel coding switching theory and techniques, communication protocols optical communications microwave theory and techniques, radar, sonar antennas, wave propagation AEÜ publishes full papers and letters with very short turn around time but a high standard review process. Review cycles are typically finished within twelve weeks by application of modern electronic communication facilities.