Investigation on transmission array antenna with high power beam scanning based on spiral antenna
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摘要: 传统的透射式空馈阵列存在功率容量低的缺点，不能直接应用于高功率微波领域。现有的高功率空馈阵列布局不够灵活，波束扫描速度较慢，不能充分发挥空馈阵列在系统集成方面的优势。提出并设计了一种新型的采用空间馈电的螺旋辐射单元，并构建了一种透射式空馈螺旋阵列天线，通过控制单个螺旋旋转可以实现二维波束扫描，在设计上更加灵活，可根据实际应用需求调整阵列布局，符合高功率微波天线紧凑化、模块化的发展趋势。仿真设计了包含324个单元的透镜阵列，数值模拟结果表明，单元反射系数S11≤−20 dB，功率容量0.35 MW，阵列口径效率0.68，可在±45°范围内扫描，最大增益下降3 dB。Abstract: The traditional transmissive air-fed array suffers from the drawback of low power capacity and cannot be directly applied in the high-power microwave field. The existing high-power air-fed array layouts are not flexible enough and have slow beam scanning speeds, which cannot fully exploit the advantages of phased arrays in system integration. This article proposes and designs a new type of spiral radiation unit using spatial feed, and constructs a transmissive air-fed spiral array antenna. By controlling the rotation of individual spirals, two-dimensional beam scanning can be achieved, making the design more flexible and adaptable to the actual application requirements, in line with the compact and modular development trend of high-power microwave antennas. An array consisting of 324 units was simulated and designed. The numerical simulation results show that the unit S11≤−20 dB, power capacity is 0.35 MW, array aperture efficiency is 0.68, and it can scan within the range of ±45°, with a maximum gain reduction of 3 dB.
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图 7 透镜单元的S参数及远场方向图
Figure 7. S parameters and far field direction pattern of antenna unit
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