Subarray Design for C-Band Circularly-Polarized Synthetic Aperture Radar Antenna Onboard Airborne

IF 6.7 1区计算机科学 Q1 Physics and Astronomy

Progress in Electromagnetics Research-Pier Pub Date : 2018-01-01 DOI:10.2528/PIER18060602

C. E. Santosa, J. Sumantyo, C. M. Yam, K. Urata, K. Ito, S. Gao

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引用次数: 15

Abstract

Abstract—This paper presents the design and realization of a 4 × 4 broadband circularly polarized microstrip antenna as subarray element for airborne C-band circularly polarized synthetic aperture radar (CP-SAR). The main objective of this work is to optimize impedance bandwidth, axial-ratio bandwidth, gain, and radiation pattern of a CP-SAR array antenna due to the limitation in the available space for a large array antenna installation on airborne platform. Various patch separations in uniformly 2 × 2 subarray configuration have been simulated to investigate characteristics of impedance bandwidth, axialratio bandwidth, gain, and radiation pattern. In order to broaden impedance bandwidth, the proposed antenna is constructed by stacking two thick substrates with low dielectric constant and dissipation factor. The measured 10-dB impedance bandwidth is 0.91 GHz (17.2%), spanning from 4.83 GHz to 6.01 GHz. A simple square patch with curve corner-truncation is applied as the main radiating patch for circularly-polarized wave generation. The radiating patch is excited by single-fed proximity coupled strip-line feeding. The improvement of axial-ratio bandwidth in 2 × 2 and 4 × 4 subarray is employed by a feeding network with serial-sequential-rotation configuration. Experimental result shows the 3dB axial-ratio bandwidth achieved 1.18 GHz (22.17%) from 4.8 GHz to 5.71 GHz. Other characteristic parameters such as gain and radiation pattern of the 4 × 4 subarray antenna are also presented and discussed.

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机载c波段圆极化合成孔径雷达天线子阵设计

摘要:本文设计并实现了一种4 × 4宽带圆极化微带天线作为机载c波段圆极化合成孔径雷达(CP-SAR)的子阵单元。由于机载平台上的大型阵列天线安装空间有限，本工作的主要目标是优化CP-SAR阵列天线的阻抗带宽、轴比带宽、增益和辐射方向图。模拟了均匀2 × 2子阵列结构中不同的贴片分离，研究了阻抗带宽、轴向比带宽、增益和辐射方向图的特性。为了扩大阻抗带宽，该天线采用低介电常数和低耗散系数的厚衬底叠加而成。测量的10 db阻抗带宽为0.91 GHz(17.2%)，范围从4.83 GHz到6.01 GHz。采用曲线角截断的简单方形贴片作为圆极化波产生的主辐射贴片。辐射斑由单馈近耦合带线馈电激发。采用连续-顺序-旋转馈电网络，提高了2 × 2和4 × 4子阵列的轴比带宽。实验结果表明，从4.8 GHz到5.71 GHz, 3dB轴比带宽达到1.18 GHz(22.17%)。对4 × 4子阵天线的增益和辐射方向图等特性参数也进行了讨论。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Progress in Electromagnetics Research-Pier 物理-电信学

CiteScore

7.20

自引率

3.00%

发文量

审稿时长

1.3 months

期刊介绍： Progress In Electromagnetics Research (PIER) publishes peer-reviewed original and comprehensive articles on all aspects of electromagnetic theory and applications. This is an open access, on-line journal PIER (E-ISSN 1559-8985). It has been first published as a monograph series on Electromagnetic Waves (ISSN 1070-4698) in 1989. It is freely available to all readers via the Internet.