A low-profile dual-broadband dual-circularly-polarized reflectarray for K-/Ka-band space applications  

作　　者：Xuanfeng TONG Zhi Hao JIANG Yuan LI Fan WU Lin PENG Taiwei YUE Wei HONG 

机构地区：[1]State Key Laboratory of Milimeter Waves,School of Information Science and Engineering,Southeast University,Nanjing 210096,China [2]Purple Mountain Laboratories,Nanjing 21lll,China [3]State Key Laboratory of Mobile Network and Mobile Multimedia Technology,ZTE Corporation,Shenzhen 518057,China [4]Apple Inc.,One Apple Park Way,Cupertino,CA 95014,USA

出　　处：《Frontiers of Information Technology & Electronic Engineering》2024年第8期1145-1161,共17页信息与电子工程前沿（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.62122019,62293492,and 61901106);the ZTE Corporation and the State Key Laboratory of Mobile Network and Mobile Multimedia Technology,and the Fundamental Research Funds for Central Universities,China(No.2242022k60008)。

摘　　要：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 O.1az.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：Broadband DUAL-BAND Dual-circularly-polarized REFLECTARRAY Shared-aperture 

分 类 号：TN82[电子电信—信息与通信工程]