基于指数渐变馈电结构的超宽带抛物面天线设计

设计了一种超宽带抛物面天线，将其馈电部分设计为指数渐变形式的四个馈电臂。给出了该天线的设计思想和设计方法，通过电磁仿真着重研究了指数渐变率和馈电臂间夹角对天线性能的影响，并详细分析了天线的阻抗特性和辐射特性。根据所设计的参数制作天线实物并进行测试，实测天线电压驻波比小于2的频带宽度达到0.95 GHz~20 GHz，天线的增益在2 GHz~14 GHz范围内为15.5 dB~30.5 dB。仿真与测试结果表明,该天线具有超宽带和高增益的特点，非常适用于超宽带通信、超宽带雷达以及无线监测与管理等系统。

Design of ultra-wideband paraboloid antenna based on exponential tapered feed structure

An ultra-wideband parabolic antenna is designed, whose feed is designed as four exponential tapered feed arms. The designing idea and method are introduced firstly. Then, the influence of different exponential tapered rates and the angle between feed arms on antenna performance is researched by electromagnetic simulation, and the impedance and radiation performance are analyzed in detail. Finally, the experiment model is fabricated and measured. The measured bandwidth is from 0.95 GHz to 20 GHz on conditions that the voltage standing wave ratio is lower than 2, and the gain is 15.5 dB to 30.5 dB within the frequency range 2 GHz to 14 GHz. Simulation and measurement results verify that this antenna has not only ultra wide impedance bandwidth but also high gain. The antenna is suitable for ultra-wideband communication, ultra-wideband radar, and wireless monitoring and management systems.