【作者】 徐远超； 吴昌英；

【Author】 XU Yuanchao;WU Changying;College of Electronics and Information Engineering,Northwestern Polytechnical University;

【机构】 西北工业大学电子信息学院；

【摘要】 平面四臂等角螺旋天线属于非频变天线系列,能够在很宽的频带内具有良好的阻抗特性、方向图特性以及圆极化特性,因而被广泛应用。传统的四臂螺旋天线馈电网络规模庞大,结构复杂,制作成本很高。本文采用了一种新型匹配网络。由于其功分、移相功能一体化,并具有平衡馈电的结构,因此结构得到简化,规模大大缩小,在中心工作频率2.3GHz处,主辐射方向轴比为0.4dB,并且天线的驻波(VSWR<1.5)和轴比(AR<1dB)带宽达到20%,方向图具有宽角轴比(±50o圆锥角内轴比小于2d B)和宽波束(±50o圆锥角内增益大于0dB)特性。更多还原

【Abstract】 4-arm equiangular spiral antennas belong to frequency-independent antennas.Because they have a good impedance characteristic,pattern and circular polarization characteristic in wide frequency band,so it has been widely applied all over the world.The feed network of traditional 4-arm spiral antennas has a bulky size,a complex structure and a high production cost.In this paper,a new type of matching feed network is presented.The structure is simplified and the size is smaller because of the integration of power distribution performance,phase compensation function and a special balance feed.At the center frequency 2.3 GHz,the axial ratio in the main radiation direction is 0.4 dB.The 1.5 V standing wave ratio(VSWR<1.5) and 1 dB axial ratio(AR<1 dB) bandwidth can be achieved nearly 20%.At the same time,we obtained the radiation pattern with the characteristics of wide-angel axial ratio(within the ±50 o cone Angle,AR<2 dB) and wide-beam(within the ±50 o cone Angle,Gain>0 dB).更多还原