基于紧耦合端射的低剖面超宽带相控阵天线设计

Design of low profile and ultra-wideband phased array antenna based on tightly-coupling and end-fire

超宽带、低剖面、宽角扫描、高增益和耐高功率是多功能相控阵天线的主要性能需求,通常难以兼顾.针对该问题,本文结合紧耦合和端射机理,在传统金属Vivaldi天线基础上,提出了一种多功能相控阵天线的设计方法.对704元天线阵进行了设计,并进行了仿真,结果表明:所设计的天线阵列在俯仰±60°、方位±45°扫描空域无栅瓣,大角度扫描有源电压驻波比在9倍频程下小于6.1、在高频3倍频程下小于3,同时高频段阵元增益大于5 dB的带宽高达3GHz.对实物进行了加工和测试,测试结果与仿真数据吻合良好.该天线阵具有超宽带、低剖面、宽角扫描、高增益、高可靠性、耐高功率和易于实现等特点,在相控阵天线中有重要的应用价值.

Ultra-wideband,low profile,wide-angle scanning,high gain and high power resistance are the main performance requirements of multifunctional phased array antennas,which are usually difficult to be balanced.To solve this problem,this paper proposes a design method of a multi-functional phased array antenna based on the traditional metal Vivaldi antenna based on the tight coupling and end-fire mechanism.The 704 elements antenna array is designed,the simulation results show that the designed antenna array can realize pitch±60°and azimuth±45°non grating lobe scanning,the active voltage standing wave ratio(AVSWR)of wide angle scanning is less than 6.1 in 9-octave frequency and 3 in 3-octave frequency of high frequency band,and the cell gain in 3 GHz bandwidth of high frequency band is better than 5 dB.The antenna array is processed and tested,and the test results are in good agreement with the simulation data.In addition,the proposed antenna array has the characteristics of ultra-wideband,low profile,wide-angle scanning,high gain,high reliability,high power tolerance and easy implementation,which has important application value in phased array antennas.