摘要
本文研究了一种小型圆极化微带天线在低仰角下抑制交叉极化的方法.文中提出了在辐射贴片上设置一个交叉槽来缩小天线尺寸,其高度和直径的仅为0.123倍波长和0.777倍波长.进一步针对该天线,分析了天线在不同底板类型下的低仰角交叉极化特性,提出了一种紧凑的弯折线环腔底板结构.采用紧凑的MLRC(Meander-Line Ring Cavity)结构可以显著降低天线在低仰角下的交叉极化,并且在整个上半空间的轴比(AR,Axial Ratio)也得到改善.所获得的腔体高度和直径仅为0.064倍波长和0.448倍波长.天线电压驻波比(VSWR,Voltage Standing Wave Ratio)小于2的阻抗带宽达到20.8%,轴比小于3dB的圆极化带宽为8.5%.从天顶到水平面,交叉极化电平不大于23.2dB.轴比小于3dB时,波束宽度可达190°以上.
A method of suppressing the cross polarisation of a miniaturised circularly polarised(CP)microstrip anten⁃na at low elevation angle is studied.A crossed slot on the radiation patch is utilised to miniaturise the proposed antenna,the antenna height is 0.777 times the wavelength,and the antenna diameter is 0.123 times the wavelength.Furthermore,the cross polarisation of the antenna at low elevation angle is analysed with different ground types,and a compact meander-line ring cavity(MLRC)ground is proposed.The cross polarisation at low elevation angle can be reduced significantly for the an⁃tenna with a compact MLRC,and the axial ratio(AR)is also improved in the whole upper-half space.The achieved height and diameter of the cavity are just 0.064 times the wavelength and 0.448 times the wavelength.The impedance bandwidth for voltage standingwave ratio(VSWR)less than 2 is 20.8%,and the CP bandwidth for AR less than 3dB is 8.5%.From the zenith to the horizontal,the cross-polarised levels are not greater than 23.2dB.The beamwidth for AR less than 3dB reaches more than 190°.
作者
罗艺
柳志荣
LUO Yi;LIU Zhi-rong(The 10th Research Institute of China Electronics Technology Group Corporation,Chengdu,Sichuan610036,China;Shaanxi Lanying Aviation Electric Co.,Ltd.,Xi'an,Shaanxi710000,China)
出处
《电子学报》
EI
CAS
CSCD
北大核心
2021年第12期2490-2496,共7页
Acta Electronica Sinica
关键词
圆极化
天线
交叉极化
弯折线环腔
低仰角
圆极化带宽
circularly polarised
antenna
cross polarisation
meander-line ring cavity
low elevation angle
the CP bandwidth
