机载圆锥对数螺旋天线及两种馈电方式的研究

Research on the Airborne Conical Log-Spiral Antennas with Two Types of Excitation

论述了机载圆锥对数螺旋天线及其两种馈电方式的设计方法。利用FEKO软件对圆锥对数螺旋天线和两种平衡馈电方式进行了优化仿真分析。结果说明,该天线的电特性能够满足实际工程应用要求。在此基础上,研制了天线实物样机,并对该天线实物样机进行了测试。测试结果表明该天线在2.5～8GHz的工作频率范围内,方向图3dB波瓣宽度为100°左右,轴比小于3dB,驻波系数小于2。测试数据说明该天线的测试结果和仿真分析结果吻合良好,同时也说明该圆锥对数螺旋天线具有宽频带圆极化及宽频带宽波束特性,进而说明该设计方法是有效可行的,并可以推广应用。

The design method of the airborne conical log-spiral antennas fed with two types of excitation is presented. The conical log-spiral antennas fed with two types of excitation are simulated and optimized by commercial EDA software FEKO. The simulated resuhs show that the characters of this antenna are enough to content application. On this condition, the prototype of the antenna is constructed and measured. The proposed antenna designed working from 2.5GHz to 8GHz has the characters that 3dB beam width is about 100°, axial ratio is less than 3dB, and VSWR is less than 2. The measured results agree well with simulated ones. The measured results show that the conical log-spiral antennas are of wide band, wide beamwidth and circular polarization. In addition, the measured results show that this design method is valid and it can be applied.