新型宽带数字多波束相控阵天线设计

新型宽带数字多波束相控阵天线设计

内容简介：传统相控阵天线系统为实现多波束，在重量、体积、功耗等方面会有明显的增加，系统的基本可靠性也显著降低。基于软件无线电思想，利用超外差结构实现宽带信号变频，并对瞬时带宽内的信号同时进行模/数或数/模变换，再根据串口提供的每个波束方位、俯仰和频率等信息，在基带实现数字多波束形成。设计了一套S频段、瞬时宽带100 MHz的数字多波束相控阵天线系统。测试结果表明，该天线可收发同时形成3个独立波束，每个波束在俯仰面0°～70°、方位面全向的扫描范围内实现EIRP值不小于40 dBm，G/T值不小于-20 dB/K的优良指标。该设计可以有效提高系统灵活性，降低系统的复杂度。

Abstract： With the increasing numbers of beamforming,the weight,size,power consumption of traditional digi-tal multi-beam phased array antennas may increase significantly,and the system′s basic reliability will decrease significantly. Based on software radio theory,a new method is presented. Superheterodyne is used to realize wideband signal frequency changing,and A/D or D/A converter of signals is realized in instantaneous band-width simultaneously.According to the azimuth angle,pitch angle and frequence supported by series port,the multi-beam is formed in the baseband. An S-band digital multi-beam phased array antenna with 100 MHz in-stantaneous bandwidth is designed. The experimental results show that the T/R antennas can form three inde-pendent beams simultaneously. In the azimuthal omnidirectional scanning range of pitch angle 0°~70°,the EIRP is not less than 40 dBm,and G/T is not less than -20 dB/K. The design can retrench a lot of hardware devices,and reduce the complexity of the system.

作者：任燕飞, 张云, 曾浩, 郝黎宏, 唐洪军,

关键词：相控阵, 宽带天线, 数字多波束, 软件无线电,