A back lobe reduction of aperture coupled microstrip antenna using DGS

H. Alias, Mohd Ali, S. Ramli, M. M. Sulaiman, S. Kayat
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引用次数: 12

Abstract

This paper presents a novel design of aperture coupled microstrip antenna with back lobe reduction. The proposed design was based on the structure of a 2 by 2 planar array antenna with separated feeding technique, aperture coupler. The antenna is designed on Rogers Duroid substrate having dielectric, ε, of 2.2. Four dumbbell shaped DGS were etched on the ground plane for back radiation reduction. An antenna without DGS is first designed acting as reference. Both of the designs were simulated in CST Microwave Studio 2011 software based on operating frequency of 5.8GHz. A parametric study was done to investigate the effect of DGS dimensions. The results show that, by incorporating DGS onto the antenna, back radiation is reduced. The back lobe level is reduced from 4.6dB to 0.4887dB. Return loss were also improved from -26.089dB to -41.28dB. This design concept can be useful in reducing the back radiation of aperture coupled microstrip antenna.
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基于DGS的孔径耦合微带天线后瓣抑制
提出了一种新型的后瓣减小孔径耦合微带天线设计。提出了一种基于分离馈电技术、孔径耦合器的2 × 2平面阵列天线结构设计方案。该天线设计在介电ε为2.2的Rogers Duroid衬底上。在地平面上蚀刻4个哑铃形的DGS以减少背辐射。首先设计了不带DGS的天线作为参考。两种设计都在CST Microwave Studio 2011软件中进行了仿真,工作频率为5.8GHz。通过参数研究探讨了DGS维度的影响。结果表明,通过在天线上加入DGS,可以减少天线的背辐射。后瓣电平从4.6dB降低到0.4887dB。回波损耗也从-26.089dB改善到-41.28dB。该设计思想可用于减小孔径耦合微带天线的背辐射。
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