内外径馈电的八臂缝隙螺旋天线  

A 8-Arm Spiral Slot Antenna with Inner-Outer Feeding Network

作　　者：张勇虎[1] 周力[1] 欧钢[1] 

机构地区：[1]国防科技大学电子科学与工程学院卫星导航研发中心,长沙410073

出　　处：《微波学报》2006年第B06期53-56,共4页Journal of Microwaves

摘　　要：设计一种新型串行馈电的双频段八臂缝隙螺旋天线。在天线缝隙螺旋臂的内径端对谐振于一个频段的四臂实行串行馈电,在外径端对谐振于另一个频段的四臂实行串行馈电,两个频段的螺旋臂互相交错以保证天线的轴对称性。这种结构的天线可实现双频段双接口输出,且双频段的圆极化方式任意组合。设计制作了GPS双频天线原型,测试结果表明,双频段上天线的法向增益大于5.7dBic,5°仰角以上的增益大于-6dBic,相位中心稳定度小于6mm。A novel dual-band 8-arm spiral slot antenna with serial feed is designed. Four arms coupled to inner feeding network resonate at one band and the other four arms coupled to outer feeding network resonate at the other band. The L1 arms and L2 arms are interleaved to maintain a natural symmetry of the antenna. The antenna has two output ports with each resonate at one band. Each band of the antenna can be left circular polarization or right circular polarization. A protocol antenna resonating at GPS L1 band and L2 band is designed and fabricated. Measured results indicate that zenith gain of the antenna at both resonant frequencies is more than 5.7dBic, gain above 5° elevation angle is more than -6dBic, and phase center stability is no more than 6mm.

关 键 词：缝隙螺旋天线 串行馈电 内外径馈电 

分 类 号：TN823[电子电信—信息与通信工程]