Xuanfeng Tong, Zhi Hao Jiang, Yuan Li, Fan Wu, Lin Peng, Taiwei Yue, Wei Hong
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引用次数: 0
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.
本文提出并演示了一种低调的双宽带双圆极化(dual-CP)反射阵列(RA),支持 K 波段和 Ka 波段左右手 CP 波的独立波束成形。实现这种功能的方法是在 K 波段和 Ka 波段中分别加入多层移相元件,然后在共享孔径中交错排列,从而使单元厚度仅为 0.1λL 左右。通过围绕各自的几何中心旋转所设计的 K 波段和 Ka 波段元件,可以分别调制每个波段的双 CP 波。为了减小整体轮廓,我们设计了基于磁电偶极子和多分支混合耦合器的宽带平面 K-/Ka 波段双 CP 馈源。平面馈电在 K 波段和 Ka 波段的带宽分别达到约 32% 和 26%,反射幅度低于 -13 dB,轴向比小于 2 dB,增益变化小于 1 dB。与平面馈源集成的双波段双 CP RA 的概念验证已经制作完成,并进行了表征,它能够产生非对称分布的双波段双 CP 波束。测得的波束峰值增益约为 24.3 和 27.3 dBic,低频段和高频段的联合增益变化<1 dB 和轴向比<2 dB 带宽分别大于 20.6% 和 14.6%。所展示的具有四个波束成形自由度的双宽带双 CP RA 有望成为空间和卫星通信的理想选择。
期刊介绍:
Frontiers of Information Technology & Electronic Engineering (ISSN 2095-9184, monthly), formerly known as Journal of Zhejiang University SCIENCE C (Computers & Electronics) (2010-2014), is an international peer-reviewed journal launched by Chinese Academy of Engineering (CAE) and Zhejiang University, co-published by Springer & Zhejiang University Press. FITEE is aimed to publish the latest implementation of applications, principles, and algorithms in the broad area of Electrical and Electronic Engineering, including but not limited to Computer Science, Information Sciences, Control, Automation, Telecommunications. There are different types of articles for your choice, including research articles, review articles, science letters, perspective, new technical notes and methods, etc.