面向K/Ka波段空间应用的低剖面双宽频双圆极化反射阵天线
A low-profile dual-broadband dual-circularly-polarized reflectarray for K-/Ka-band space applications
童宣锋 1蒋之浩 2李远 1吴凡 1彭琳 3岳泰巍 4洪伟2
作者信息
- 1. 东南大学信息科学与工程学院毫米波全国重点实验室,中国 南京市,210096
- 2. 东南大学信息科学与工程学院毫米波全国重点实验室,中国 南京市,210096;紫金山实验室,中国 南京市,211111
- 3. 中兴通讯公司移动网络与移动多媒体技术重点实验室,中国 深圳市,518057
- 4. 苹果公司,美国加利福尼亚州库比蒂诺,95014
- 折叠
摘要
提出并验证了一款能够独立控制K波段和Ka波段右旋圆极化/左旋圆极化波束指向的低剖面双宽频双圆极化反射阵天线.该反射阵天线通过将工作于K/Ka波段的多层移相单元进行共口径交错排布实现,其厚度仅为0.1λL.将设计的K/Ka波段反射阵单元分别围绕它们各自的几何中心旋转后,实现了对每个频段双圆极化波的独立调制.此外,为降低天线总体剖面高度,基于磁电偶极子和多阶耦合器设计了K/Ka波段双圆极化平面天线作为馈源,其可在32%和26%带宽内具有反射系数幅度小于-13 dB、轴比低于2 dB以及增益变化小于1 dB的特性.最后,将所设计的反射阵和馈源天线集成后实现了双宽频双圆极化反射阵天线,其产生的双频双圆极化波束可非对称地分布在x-z面和y-z面内.对所设计的反射阵天线进行加工和实验验证,其在低频和高频实测的最大增益值分别为24.3 dBic和27.3 dBic、实测的1 dB增益和2 dB轴比带宽分别为20.6%和14.6%.该双宽频双圆极化反射阵天线具备4个波束成形自由度,有望成为空间通信和卫星通信的有力备选器件之一.
Abstract
A low-profile dual-broadband dual-circularly-polarized(dual-CP)reflectarray(RA)is proposed and demonstrated,supporting independent beamforming for right-/left-handed CP waves at both K-band and Ka-band.Such functionality is achieved by incorporating multi-layered phase shifting elements individually operating in the K-and Ka-band,which are then interleaved in a shared aperture,resulting in a cell thickness of only about 0.1λL.By rotating the designed K-and Ka-band elements around their own geometrical centers,the dual-CP waves in each band can be modulated separately.To reduce the overall profile,planar K-/Ka-band dual-CP feeds with a broad band are designed based on the magnetoelectric dipoles and multi-branch hybrid couplers.The planar feeds achieve bandwidths of about 32%and 26%at K-and Ka-band respectively with reflection magnitudes below-13 dB,an axial ratio smaller than 2 dB,and a gain variation of less than 1 dB.A proof-of-concept dual-band dual-CP RA integrated with the planar feeds is fabricated and characterized which is capable of generating asymmetrically distributed dual-band dual-CP beams.The measured peak gain values of the beams are around 24.3 and 27.3 dBic,with joint gain variation<1 dB and axial ratio<2 dB bandwidths wider than 20.6%and 14.6%at the lower and higher bands,respectively.The demonstrated dual-broadband dual-CP RA with four degrees of freedom of beamforming could be a promising candidate for space and satellite communications.
关键词
宽带/双频/双圆极化/反射阵/共口径Key words
Broadband/Dual-band/Dual-circularly-polarized/Reflectarray/Shared-aperture引用本文复制引用
基金项目
National Natural Science Foundation of China(62122019)
National Natural Science Foundation of China(62293492)
National Natural Science Foundation of China(61901106)
ZTE Corporation and the State Key Laboratory of Mobile Network and Mobile Multimedia Technology()
Fundamental Research Funds for Central Universities,China(2242022k60008)
出版年
2024
NETL
NSTL
万方数据