A Novel Shaping Design Technique of the Elliptical Beam Antenna
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摘要: 针对双频段低剖面椭圆波束天线的需求,该文提出了一种新型混合结构椭圆波束天线的设计技术。该混合结构由主、副反射面内环部分构成的椭圆波束环焦天线和外环部分构成的椭圆波束卡塞格伦天线组成。该文描述了椭圆波束天线的设计思路、设计步骤和赋形计算公式,给出一个600 mm×1200 mm椭圆波束天线的设计实例,并进行了容差分析,该天线的工作频率覆盖了Ku/Ka双频段,效率达到56%以上,电压驻波比(VSWR)低于1.27,俯仰面第1旁瓣低于–12.2 dB,方位面第1旁瓣低于–14.6 dB。商业软件Grasp和CST全波仿真的结果吻合很好,证明了该新颖结构和设计方法的有效性。Abstract: In order to satisfy the requirement of elliptical beam antenna with low profile, a novel design technique of the hybrid-structural antenna with elliptical beam is proposed. The hybrid-structural antenna consists of the ring-focus elliptical antenna in inner-ring region and the Cassegrain elliptical antenna in outer-ring region. The design method, procedure and shaping formula are presented in detail. A 600 mm×1200 mm reflector antenna is designed and its tolerance analysis is also given. The results show that the novel structural antenna can operate in Ku/Ka dual bands, antenna efficiency is greater than 56% and Voltage Standing Wave Ratio (VSWR) is better than 1.27, and its side lobe levels in the EL and AZ planes are below –12.2 dB and –14.6 dB respectively. The simulated results of Grasp and CST software agree well, which verify the effectiveness of the design method.
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表 1 Grasp仿真的天线辐射性能
频率(GHz) 11.45 12.75 14.00 14.50 17.70 21.20 29.40 31.00 增益(dBi) 38.50 39.40 40.20 40.51 42.40 44.01 46.72 47.17 俯仰面旁瓣(dB) –15.27 –14.95 –14.86 –14.84 –15.54 –15.41 –15.08 –15.03 45°面旁瓣(dB) –21.28 –21.13 –21.12 –21.06 –20.42 –19.59 –20.10 –19.65 方位面旁瓣(dB) –18.60 –19.08 –19.33 –19.45 –19.15 –18.87 –17.26 –17.00 口径效率(%) 60.75 60.36 60.10 60.16 62.39 63.11 61.16 61.00 表 2 CST全波仿真的天线辐射性能
频率(GHz) 11.45 12.75 14.00 14.50 17.70 21.20 29.40 31.00 增益(dBi) 38.62 39.39 40.15 40.49 42.08 43.83 46.50 47.10 俯仰面旁瓣(dB) –13.15 –12.51 –13.83 –13.36 –12.79 –14.40 –17.24 –15.92 45°面旁瓣(dB) –16.24 –17.79 –17.13 –16.83 –18.05 –19.43 –19.15 –19.70 方位面旁瓣(dB) –15.00 –17.45 –15.61 –15.42 –16.96 –18.97 –19.00 –18.53 口径效率(%) 62.50 60.18 59.46 59.94 58.01 60.50 58.18 60.08 表 3 考虑公差后的天线辐射性能
频率(GHz) 11.45 12.75 14.00 14.50 17.70 21.20 29.40 31.00 增益(dBi) 38.58 39.29 39.97 40.46 42.05 43.81 46.37 46.87 俯仰面旁瓣(dB) –12.92 –12.36 –13.71 –13.23 –12.21 –15.20 –16.61 –15.42 45°面旁瓣(dB) –16.55 –16.71 –17.00 –16.06 –17.15 –18.53 –19.12 –18.80 方位面旁瓣(dB) –15.13 –16.03 –15.61 –14.67 –16.67 –16.91 –15.88 –17.01 口径效率(%) 61.92 58.81 57.04 59.53 57.61 60.23 56.46 56.98 -
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