Design and experimental study of high-power built-in curved meander-line polarization conversion radome
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摘要: 为了实现天线罩的轻量化，同时满足高功率的应用，提出了一种高功率内置弧形折线栅式极化转换天线罩。该天线罩将弧形折线栅式极化转换板放置于介质密封罩内部，通过对弧形折线栅单元结构及介质密封罩结构的联合设计，在实现轻量化的同时降低了金属栅上的电场，使其更加有利于在高功率微波领域的工程应用。针对C波段高功率线极化螺旋阵列天线的应用需求，优化设计了一个中心频率为4.3 GHz的高功率极化转换天线罩，将其加载至某高功率径向线螺旋阵列天线上开展了辐射特性和功率容量的仿真和测试，仿真和实验结果吻合，该天线罩可实现圆极化波到线极化波的转换，其中心频率下的插入损耗为0.2 dB，主射方向轴比为20 dB，功率容量达到48 MW。Abstract: To reduce the weight of the radome and meet the high-power application requirement, a high-power built-in curved meander-line polarization conversion radome is proposed. The radome has the curved meander-line polarization conversion plate inside the dielectric sealing cover, and through joint optimization of the arc-shaped broken wire grid unit structure and the dielectric sealing cover structure, the weight is reduced while the electric field on the metal grid is reduced, which is more conducive to engineering applications in the high-power field. In response to the application requirements of the C-band high-power linear polarization helical array antenna, a high-power polarization conversion radome with a center frequency of 4.3 GHz was optimized and loaded on the high-power helical array antenna. And the radiation characteristics and power capacity were tested. The simulation and experimental results are consistent. The radome can convert circularly polarized waves to linearly polarized waves. Its insertion loss is 0.2 dB, its axial ratio is 20 dB, and its power capacity reaches 48 MW.
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Key words:
- high power microwave /
- polarization conversion /
- radome /
- built-in curved meander-line
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图 1 内置折线栅式天线罩结构原理图
Figure 1. Schematic diagram of the structure of the built-in meander-line radome
图 2 折线栅对于Ex分量和Ey分量的等效电路
Figure 2. Transmission line equivalent circuit for the meander line polarizer observed by Ex and Ey
图 3 弧形折线栅及内置折线栅式天线罩结构原理图
Figure 3. The model of element and the electric field distribution
图 4 不同折线栅单元电场分析
Figure 4. Electric field analysis of different meander-line radome units
图 6 加载内置弧形折线栅式极化转换天线罩的天线
Figure 6. Antenna loaded with built-in curved meander-line polarization conversion radome
图 13 子阵与辐射喇叭输出波形示意图
Figure 13. Schematic diagram of output waveform of antenna array and radiating horn
表 1 单元参数
Table 1. Parameters of the radome unit
a/mm b//mm h/mm w/mm r1/mm r2/mm 18.5 24.5 17 4.5 5.5 0.5 
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表 2 实验结果
Table 2. Results of experiments
frequency/GHz test level of standard
antenna horn/dBgain of standard
antenna horn/dBtest level of antenna
to be measured/dBgain of antenna to be
measured/dB4.25 −30.5 19.35 −26.35 23.5 4.3 −30.58 19.42 −25.96 24.04 4.35 −30.9 19.50 −26.76 23.64
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